[Bug 99841] New: Switching to VT freezes X only on a dual screen

[Bug 99841] New: Switching to VT freezes X only on a dual screen

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ]

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https://bugs.freedesktop.org/show_bug.cgi?id=99841

            Bug ID: 99841
           Summary: Switching to VT freezes X only on a dual screen
           Product: xorg
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/nouveau
          Assignee: nouveau-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org
          Reporter: riesebie-xZYEWGoilGM@public.gmane.org
        QA Contact: xorg-team-go0+a7rfsptAfugRpC6u6w@public.gmane.org

Created attachment 129683
  --> https://bugs.freedesktop.org/attachment.cgi?id=129683&action=edit
Config-4.10.0-rc8

Kernel Graphic Driver: nouveau
Dual Screen: Yes
After switching to VT via "<ctrl> <alt> FN" or "chvt N" X freezes. No keyboard
response, no pointer response.

Booting with only one screen VT-switch works as expected. Running 4.9.? runs
fine, though. Doesn't matter whether I use libinput or evdev. I don't found
meaningful logs other than the last lines in

Xorg.0.log:
  [    49.408] (II) AIGLX: Suspending AIGLX clients for VT switch¬
  [    49.408] (II) NOUVEAU(0): NVLeaveVT is called.¬
  [    54.592] (II) UnloadModule: "libinput"¬
  [    54.598] (II) UnloadModule: "libinput"¬
  [    54.598] (II) UnloadModule: "libinput"¬
  [    54.598] (II) UnloadModule: "libinput" 

xrandr:
Screen 0: minimum 320 x 200, current 3520 x 1200, maximum 16384 x 16384
DVI-I-1 connected primary 1920x1200+0+0 (normal left inverted right x axis y
axis) 518mm x 324mm
   1920x1200     59.95*+
   1920x1080     60.00    50.00    59.94  
   1600x1200     60.00  
   1680x1050     59.88  
   1280x1024     60.02  
   1440x900      59.90  
   1280x960      60.00  
   1280x800      59.91  
   1280x720      60.00    50.00    59.94  
   1024x768      60.00  
   800x600       60.32    56.25  
   720x576       50.00  
   720x480       60.00    59.94  
   640x480       60.00    59.94  
DVI-D-1 connected 1600x1200+1920+0 (normal left inverted right x axis y axis)
408mm x 306mm
   1600x1200     60.00*+
   1280x1024     75.02    60.02  
   1280x960      60.00  
   1152x864      75.00  
   1024x768      75.03    70.07    60.00  
   832x624       74.55  
   800x600       72.19    75.00    60.32    56.25  
   640x480       75.00    72.81    66.67    59.94  
   720x400       70.08  
HDMI-1 disconnected (normal left inverted right x axis y axis)
DP-1 disconnected (normal left inverted right x axis y axis)

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[Bug 99841] Switching to VT freezes X only on a dual screen

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ]

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https://bugs.freedesktop.org/show_bug.cgi?id=99841

Elimar Riesebieter <riesebie-xZYEWGoilGM@public.gmane.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Hardware|Other                       |x86-64 (AMD64)
                 OS|All                         |Linux (All)

--- Comment #1 from Elimar Riesebieter <riesebie-xZYEWGoilGM@public.gmane.org> ---
This is with 4.10.0-rc[1-8].

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[Bug 99841] Switching to VT freezes X only on a dual screen

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ]

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https://bugs.freedesktop.org/show_bug.cgi?id=99841

--- Comment #2 from Ilia Mirkin <imirkin-FrUbXkNCsVf2fBVCVOL8/A@public.gmane.org> ---
Please mention what hardware this is on.

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[Bug 99841] Switching to VT freezes X only on a dual screen

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ]

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https://bugs.freedesktop.org/show_bug.cgi?id=99841

--- Comment #3 from Elimar Riesebieter <riesebie-xZYEWGoilGM@public.gmane.org> ---
Graphics and CPU:

01:00.0 VGA compatible controller: NVIDIA Corporation GK104 [GeForce GTX 760]
(rev a1) (prog-if 00 [VGA controller])
        Subsystem: Gigabyte Technology Co., Ltd GK104 [GeForce GTX 760]
        Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr-
Stepping- SERR- FastB2B- DisINTx+
        Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort-
<MAbort- >SERR- <PERR- INTx-
        Latency: 0, Cache Line Size: 64 bytes
        Interrupt: pin A routed to IRQ 24
        Region 0: Memory at ee000000 (32-bit, non-prefetchable) [size=16M]
        Region 1: Memory at e0000000 (64-bit, prefetchable) [size=128M]
        Region 3: Memory at e8000000 (64-bit, prefetchable) [size=32M]
        Region 5: I/O ports at e000 [size=128]
        Expansion ROM at 000c0000 [disabled] [size=128K]
        Capabilities: [60] Power Management version 3
                Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA
PME(D0-,D1-,D2-,D3hot-,D3cold-)
                Status: D0 NoSoftRst+ PME-Enable- DSel=0 DScale=0 PME-
        Capabilities: [68] MSI: Enable+ Count=1/1 Maskable- 64bit+
                Address: 00000000feeff00c  Data: 4181
        Capabilities: [78] Express (v2) Endpoint, MSI 00
                DevCap: MaxPayload 256 bytes, PhantFunc 0, Latency L0s
unlimited, L1 <64us
                        ExtTag+ AttnBtn- AttnInd- PwrInd- RBE+ FLReset-
SlotPowerLimit 75.000W
                DevCtl: Report errors: Correctable- Non-Fatal- Fatal-
Unsupported-
                        RlxdOrd- ExtTag+ PhantFunc- AuxPwr- NoSnoop+
                        MaxPayload 256 bytes, MaxReadReq 512 bytes
                DevSta: CorrErr- UncorrErr- FatalErr- UnsuppReq- AuxPwr-
TransPend-
                LnkCap: Port #0, Speed 8GT/s, Width x16, ASPM L0s L1, Exit
Latency L0s <512ns, L1 <4us
                        ClockPM+ Surprise- LLActRep- BwNot- ASPMOptComp+
                LnkCtl: ASPM Disabled; RCB 64 bytes Disabled- CommClk+
                        ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-
                LnkSta: Speed 2.5GT/s, Width x16, TrErr- Train- SlotClk+
DLActive- BWMgmt- ABWMgmt-
                DevCap2: Completion Timeout: Range AB, TimeoutDis+, LTR-, OBFF
Not Supported
                DevCtl2: Completion Timeout: 50us to 50ms, TimeoutDis-, LTR-,
OBFF Disabled
                LnkCtl2: Target Link Speed: 8GT/s, EnterCompliance- SpeedDis-
                         Transmit Margin: Normal Operating Range,
EnterModifiedCompliance- ComplianceSOS-
                         Compliance De-emphasis: -6dB
                LnkSta2: Current De-emphasis Level: -3.5dB,
EqualizationComplete+, EqualizationPhase1+
                         EqualizationPhase2+, EqualizationPhase3+,
LinkEqualizationRequest+
        Capabilities: [b4] Vendor Specific Information: Len=14 <?>
        Capabilities: [100 v1] Virtual Channel
                Caps:   LPEVC=0 RefClk=100ns PATEntryBits=1
                Arb:    Fixed- WRR32- WRR64- WRR128-
                Ctrl:   ArbSelect=Fixed
                Status: InProgress-
                VC0:    Caps:   PATOffset=00 MaxTimeSlots=1 RejSnoopTrans-
                        Arb:    Fixed- WRR32- WRR64- WRR128- TWRR128- WRR256-
                        Ctrl:   Enable+ ID=0 ArbSelect=Fixed TC/VC=01
                        Status: NegoPending- InProgress-
        Capabilities: [128 v1] Power Budgeting <?>
        Capabilities: [600 v1] Vendor Specific Information: ID=0001 Rev=1
Len=024 <?>
        Capabilities: [900 v1] #19
        Kernel driver in use: nouveau


processor       : [0-7]
vendor_id       : GenuineIntel
cpu family      : 6
model           : 60
model name      : Intel(R) Core(TM) i7-4770K CPU @ 3.50GHz
stepping        : 3
microcode       : 0x19
cpu MHz         : 800.000
cache size      : 8192 KB
physical id     : 0
siblings        : 8
core id         : 0
cpu cores       : 4
apicid          : 0
initial apicid  : 0
fpu             : yes
fpu_exception   : yes
cpuid level     : 13
wp              : yes
flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov
pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx pdpe1gb
rdtscp lm constant_tsc arch_perfmon pebs bts rep_good nopl xtopology
nonstop_tsc aperfmperf eagerfpu pni pclmulqdq dtes64 monitor ds_cpl vmx est tm2
ssse3 sdbg fma cx16 xtpr pdcm pcid sse4_1 sse4_2 movbe popcnt
tsc_deadline_timer aes xsave avx f16c rdrand lahf_lm abm epb tpr_shadow vnmi
flexpriority ept vpid fsgsbase tsc_adjust bmi1 avx2 smep bmi2 erms invpcid
xsaveopt dtherm ida arat pln pts
bugs            :
bogomips        : 6996.12
clflush size    : 64
cache_alignment : 64
address sizes   : 39 bits physical, 48 bits virtual
power management:

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[Bug 99841] Switching to VT freezes X only on a dual screen

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ]

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https://bugs.freedesktop.org/show_bug.cgi?id=99841

--- Comment #4 from Elimar Riesebieter <riesebie-xZYEWGoilGM@public.gmane.org> ---
Graphics and CPU:

01:00.0 VGA compatible controller: NVIDIA Corporation GK104 [GeForce GTX 760]
(rev a1) (prog-if 00 [VGA controller])
        Subsystem: Gigabyte Technology Co., Ltd GK104 [GeForce GTX 760]
        Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr-
Stepping- SERR- FastB2B- DisINTx+
        Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort-
<MAbort- >SERR- <PERR- INTx-
        Latency: 0, Cache Line Size: 64 bytes
        Interrupt: pin A routed to IRQ 24
        Region 0: Memory at ee000000 (32-bit, non-prefetchable) [size=16M]
        Region 1: Memory at e0000000 (64-bit, prefetchable) [size=128M]
        Region 3: Memory at e8000000 (64-bit, prefetchable) [size=32M]
        Region 5: I/O ports at e000 [size=128]
        Expansion ROM at 000c0000 [disabled] [size=128K]
        Capabilities: [60] Power Management version 3
                Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA
PME(D0-,D1-,D2-,D3hot-,D3cold-)
                Status: D0 NoSoftRst+ PME-Enable- DSel=0 DScale=0 PME-
        Capabilities: [68] MSI: Enable+ Count=1/1 Maskable- 64bit+
                Address: 00000000feeff00c  Data: 4181
        Capabilities: [78] Express (v2) Endpoint, MSI 00
                DevCap: MaxPayload 256 bytes, PhantFunc 0, Latency L0s
unlimited, L1 <64us
                        ExtTag+ AttnBtn- AttnInd- PwrInd- RBE+ FLReset-
SlotPowerLimit 75.000W
                DevCtl: Report errors: Correctable- Non-Fatal- Fatal-
Unsupported-
                        RlxdOrd- ExtTag+ PhantFunc- AuxPwr- NoSnoop+
                        MaxPayload 256 bytes, MaxReadReq 512 bytes
                DevSta: CorrErr- UncorrErr- FatalErr- UnsuppReq- AuxPwr-
TransPend-
                LnkCap: Port #0, Speed 8GT/s, Width x16, ASPM L0s L1, Exit
Latency L0s <512ns, L1 <4us
                        ClockPM+ Surprise- LLActRep- BwNot- ASPMOptComp+
                LnkCtl: ASPM Disabled; RCB 64 bytes Disabled- CommClk+
                        ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-
                LnkSta: Speed 2.5GT/s, Width x16, TrErr- Train- SlotClk+
DLActive- BWMgmt- ABWMgmt-
                DevCap2: Completion Timeout: Range AB, TimeoutDis+, LTR-, OBFF
Not Supported
                DevCtl2: Completion Timeout: 50us to 50ms, TimeoutDis-, LTR-,
OBFF Disabled
                LnkCtl2: Target Link Speed: 8GT/s, EnterCompliance- SpeedDis-
                         Transmit Margin: Normal Operating Range,
EnterModifiedCompliance- ComplianceSOS-
                         Compliance De-emphasis: -6dB
                LnkSta2: Current De-emphasis Level: -3.5dB,
EqualizationComplete+, EqualizationPhase1+
                         EqualizationPhase2+, EqualizationPhase3+,
LinkEqualizationRequest+
        Capabilities: [b4] Vendor Specific Information: Len=14 <?>
        Capabilities: [100 v1] Virtual Channel
                Caps:   LPEVC=0 RefClk=100ns PATEntryBits=1
                Arb:    Fixed- WRR32- WRR64- WRR128-
                Ctrl:   ArbSelect=Fixed
                Status: InProgress-
                VC0:    Caps:   PATOffset=00 MaxTimeSlots=1 RejSnoopTrans-
                        Arb:    Fixed- WRR32- WRR64- WRR128- TWRR128- WRR256-
                        Ctrl:   Enable+ ID=0 ArbSelect=Fixed TC/VC=01
                        Status: NegoPending- InProgress-
        Capabilities: [128 v1] Power Budgeting <?>
        Capabilities: [600 v1] Vendor Specific Information: ID=0001 Rev=1
Len=024 <?>
        Capabilities: [900 v1] #19
        Kernel driver in use: nouveau


processor       : [0-7]
vendor_id       : GenuineIntel
cpu family      : 6
model           : 60
model name      : Intel(R) Core(TM) i7-4770K CPU @ 3.50GHz
stepping        : 3
microcode       : 0x19
cpu MHz         : 800.000
cache size      : 8192 KB
physical id     : 0
siblings        : 8
core id         : 0
cpu cores       : 4
apicid          : 0
initial apicid  : 0
fpu             : yes
fpu_exception   : yes
cpuid level     : 13
wp              : yes
flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov
pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx pdpe1gb
rdtscp lm constant_tsc arch_perfmon pebs bts rep_good nopl xtopology
nonstop_tsc aperfmperf eagerfpu pni pclmulqdq dtes64 monitor ds_cpl vmx est tm2
ssse3 sdbg fma cx16 xtpr pdcm pcid sse4_1 sse4_2 movbe popcnt
tsc_deadline_timer aes xsave avx f16c rdrand lahf_lm abm epb tpr_shadow vnmi
flexpriority ept vpid fsgsbase tsc_adjust bmi1 avx2 smep bmi2 erms invpcid
xsaveopt dtherm ida arat pln pts
bugs            :
bogomips        : 6996.12
clflush size    : 64
cache_alignment : 64
address sizes   : 39 bits physical, 48 bits virtual
power management:

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[Bug 99841] Switching to VT freezes X only on a dual screen

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ]

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https://bugs.freedesktop.org/show_bug.cgi?id=99841

--- Comment #5 from kevin-Fk+Xth6EFAKtEw7EPzjzzg@public.gmane.org ---
I have the same issue, I think—X freezes when switching to a TTY, but switching
back to X unfreezes the display. Furthermore, keyboard input works in the TTY,
even if it displays no output—blind login is possible.

GPU:

00:10.0 VGA compatible controller: NVIDIA Corporation GK104 [GeForce GTX 770]
(rev a1) (prog-if 00 [VGA controller])[160/1837]
        Subsystem: Micro-Star International Co., Ltd. [MSI] Device 2825
        Physical Slot: 16
        Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr-
Stepping- SERR- FastB2B- DisINTx+
        Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort-
<MAbort- >SERR- <PERR- INTx-
        Latency: 0, Cache Line Size: 64 bytes
        Interrupt: pin A routed to IRQ 45
        Region 0: Memory at c0000000 (32-bit, non-prefetchable) [size=16M]
        Region 1: Memory at 800000000 (64-bit, prefetchable) [size=128M]
        Region 3: Memory at 808000000 (64-bit, prefetchable) [size=32M]
        Region 5: I/O ports at 1000 [size=128]
        Expansion ROM at 000c0000 [disabled] [size=128K]
        Capabilities: [60] Power Management version 3
                Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA
PME(D0-,D1-,D2-,D3hot-,D3cold-)
                Status: D0 NoSoftRst+ PME-Enable- DSel=0 DScale=0 PME-
        Capabilities: [68] MSI: Enable+ Count=1/1 Maskable- 64bit+
                Address: 00000000feeff00c  Data: 41d2
        Capabilities: [78] Express (v2) Endpoint, MSI 00
                DevCap: MaxPayload 256 bytes, PhantFunc 0, Latency L0s
unlimited, L1 <64us
                        ExtTag+ AttnBtn- AttnInd- PwrInd- RBE+ FLReset-
SlotPowerLimit 75.000W
                DevCtl: Report errors: Correctable- Non-Fatal- Fatal-
Unsupported-
                        RlxdOrd- ExtTag+ PhantFunc- AuxPwr- NoSnoop+
                        MaxPayload 256 bytes, MaxReadReq 512 bytes
                DevSta: CorrErr- UncorrErr- FatalErr- UnsuppReq- AuxPwr-
TransPend-
                LnkCap: Port #0, Speed 8GT/s, Width x16, ASPM L0s L1, Exit
Latency L0s <1us, L1 <4us
                        ClockPM+ Surprise- LLActRep- BwNot- ASPMOptComp+
                LnkCtl: ASPM Disabled; RCB 64 bytes Disabled- CommClk+
                        ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-
                LnkSta: Speed 8GT/s, Width x16, TrErr- Train- SlotClk+
DLActive- BWMgmt- ABWMgmt-
                DevCap2: Completion Timeout: Range AB, TimeoutDis+, LTR-, OBFF
Not Supported
                DevCtl2: Completion Timeout: 50us to 50ms, TimeoutDis-, LTR-,
OBFF Disabled
                LnkSta2: Current De-emphasis Level: -6dB,
EqualizationComplete+, EqualizationPhase1+
                         EqualizationPhase2+, EqualizationPhase3+,
LinkEqualizationRequest+
        Capabilities: [b4] Vendor Specific Information: Len=14 <?>
        Kernel driver in use: nouveau
        Kernel modules: nouveau

CPU:

processor       : [0-7]
vendor_id       : GenuineIntel
cpu family      : 6
model           : 62
model name      : Intel(R) Core(TM) i7-4820K CPU @ 3.70GHz
stepping        : 4
microcode       : 0x1
cpu MHz         : 3699.939
cache size      : 4096 KB
physical id     : 0
siblings        : 8
core id         : 7
cpu cores       : 8
apicid          : 7
initial apicid  : 7
fpu             : yes
fpu_exception   : yes
cpuid level     : 13
wp              : yes
flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov
pat pse36 clflush mmx fxsr sse sse2 ss ht syscall nx pdpe1gb rdtscp lm
constant_tsc arch_perfmon rep_good nopl xtopology pni pclmulqdq vmx ssse3 cx16
pcid sse4_1 sse4_2 x2apic popcnt tsc_deadline_timer aes xsave avx f16c rdrand
hypervisor lahf_lm tpr_shadow vnmi flexpriority ept vpid fsgsbase tsc_adjust
smep erms xsaveopt arat
bugs            :
bogomips        : 7415.70
clflush size    : 64
cache_alignment : 64
address sizes   : 40 bits physical, 48 bits virtual
power management:

xrandr:

Screen 0: minimum 320 x 200, current 5120 x 1080, maximum 16384 x 16384
DVI-I-1 connected 1280x1024+2560+0 (normal left inverted right x axis y axis)
338mm x 270mm
   1280x1024     60.02 +  75.02*
   1152x864      75.00
   1024x768      75.03    60.00
   800x600       75.00    60.32
   640x480       75.00    59.94
   720x400       70.08
DVI-D-1 connected 1280x1024+3840+0 (normal left inverted right x axis y axis)
338mm x 270mm
   1280x1024     60.02 +  75.02*
   1152x864      75.00
   1024x768      75.03    60.00
   800x600       75.00    60.32
   640x480       75.00    59.94
   720x400       70.08
HDMI-1 connected primary 2560x1080+0+0 (normal left inverted right x axis y
axis) 798mm x 334mm
   2560x1080     60.00*+
   1920x1080     60.00    50.00    59.94    30.00    29.97
   1920x1080i    60.00    50.00    59.94
   1680x1050     59.88
   1600x900      60.00
   1280x1024     75.02    60.02
   1152x864      75.00
   1280x720      60.00    50.00    59.94
   1024x768      75.03    60.00
   800x600       75.00    60.32
   720x576       50.00
   720x480       60.00    59.94
   640x480       75.00    60.00    59.94
   720x400       70.08
DP-1 disconnected (normal left inverted right x axis y axis)

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[Bug 99841] Switching to VT freezes X only on a dual screen

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ]

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https://bugs.freedesktop.org/show_bug.cgi?id=99841

--- Comment #6 from Joseph Thommes <joseph-thommes-Mmb7MZpHnFY@public.gmane.org> ---
Created attachment 129956
  --> https://bugs.freedesktop.org/attachment.cgi?id=129956&action=edit
Xorg-log right after switching to tty and back

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[Bug 99841] Switching to VT freezes X only on a dual screen

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ]

[-- Attachment #1.1: Type: text/plain, Size: 4432 bytes --]

https://bugs.freedesktop.org/show_bug.cgi?id=99841

--- Comment #7 from Joseph Thommes <joseph-thommes-Mmb7MZpHnFY@public.gmane.org> ---
I can confirm what kevin-Fk+Xth6EFAKtEw7EPzjzzg@public.gmane.org said, same for me with 4.10.1-gentoo.
I am using a triple monitor setup with different monitors in different
resolutions and everything is fine in X.
If I press Ctrl-Alt-F1, the screens do not change but I can login in tty1.
If I kill X from there, screens turn off and a press of Ctrl-Alt-F1 brings me
to tty1.
If I restart X  from there, it's the same as in the beginning.
lspci -vv:
[...]
01:00.0 VGA compatible controller: NVIDIA Corporation GK104 [GeForce GTX 770]
(rev a1) (prog-if 00 [VGA controller])
        Subsystem: Palit Microsystems Inc. GK104 [GeForce GTX 770]
        Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr-
Stepping- SERR- FastB2B- DisINTx+
        Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort-
<MAbort- >SERR- <PERR- INTx-
        Latency: 0, Cache Line Size: 64 bytes
        Interrupt: pin A routed to IRQ 25
        Region 0: Memory at ee000000 (32-bit, non-prefetchable) [size=16M]
        Region 1: Memory at e0000000 (64-bit, prefetchable) [size=128M]
        Region 3: Memory at e8000000 (64-bit, prefetchable) [size=32M]
        Region 5: I/O ports at e000 [size=128]
        Expansion ROM at ef000000 [disabled] [size=512K]
        Capabilities: [60] Power Management version 3
                Flags: PMEClk- DSI- D1- D2- AuxCurrent=0mA
PME(D0-,D1-,D2-,D3hot-,D3cold-)
                Status: D0 NoSoftRst+ PME-Enable- DSel=0 DScale=0 PME-
        Capabilities: [68] MSI: Enable+ Count=1/1 Maskable- 64bit+
                Address: 00000000feeff00c  Data: 4191
        Capabilities: [78] Express (v2) Endpoint, MSI 00
                DevCap: MaxPayload 256 bytes, PhantFunc 0, Latency L0s
unlimited, L1 <64us
                        ExtTag+ AttnBtn- AttnInd- PwrInd- RBE+ FLReset-
SlotPowerLimit 75.000W
                DevCtl: Report errors: Correctable- Non-Fatal- Fatal-
Unsupported-
                        RlxdOrd- ExtTag+ PhantFunc- AuxPwr- NoSnoop+
                        MaxPayload 256 bytes, MaxReadReq 512 bytes
                DevSta: CorrErr- UncorrErr- FatalErr- UnsuppReq- AuxPwr-
TransPend-
                LnkCap: Port #0, Speed 8GT/s, Width x16, ASPM L0s L1, Exit
Latency L0s <512ns, L1 <4us
                        ClockPM+ Surprise- LLActRep- BwNot- ASPMOptComp+
                LnkCtl: ASPM Disabled; RCB 64 bytes Disabled- CommClk+
                        ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-
                LnkSta: Speed 2.5GT/s, Width x16, TrErr- Train- SlotClk+
DLActive- BWMgmt- ABWMgmt-
                DevCap2: Completion Timeout: Range AB, TimeoutDis+, LTR-, OBFF
Not Supported
                DevCtl2: Completion Timeout: 50us to 50ms, TimeoutDis-, LTR-,
OBFF Disabled
                LnkCtl2: Target Link Speed: 8GT/s, EnterCompliance- SpeedDis-
                         Transmit Margin: Normal Operating Range,
EnterModifiedCompliance- ComplianceSOS-
                         Compliance De-emphasis: -6dB
                LnkSta2: Current De-emphasis Level: -3.5dB,
EqualizationComplete+, EqualizationPhase1+
                         EqualizationPhase2-, EqualizationPhase3-,
LinkEqualizationRequest+
        Capabilities: [b4] Vendor Specific Information: Len=14 <?>
        Capabilities: [100 v1] Virtual Channel
                Caps:   LPEVC=0 RefClk=100ns PATEntryBits=1
                Arb:    Fixed- WRR32- WRR64- WRR128-
                Ctrl:   ArbSelect=Fixed
                Status: InProgress-
                VC0:    Caps:   PATOffset=00 MaxTimeSlots=1 RejSnoopTrans-
                        Arb:    Fixed- WRR32- WRR64- WRR128- TWRR128- WRR256-
                        Ctrl:   Enable+ ID=0 ArbSelect=Fixed TC/VC=01
                        Status: NegoPending- InProgress-
        Capabilities: [128 v1] Power Budgeting <?>
        Capabilities: [600 v1] Vendor Specific Information: ID=0001 Rev=1
Len=024 <?>
        Capabilities: [900 v1] #19
        Kernel driver in use: nouveau
[...]

uname -a:
Linux gentoo-PC 4.10.1-gentoo #2 SMP Mon Feb 27 13:38:23 CET 2017 x86_64
Intel(R) Core(TM) i7-4790 CPU @ 3.60GHz GenuineIntel GNU/Linux

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[Bug 99841] Switching to VT freezes X only on a dual screen

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ]

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https://bugs.freedesktop.org/show_bug.cgi?id=99841

--- Comment #8 from Shawn Starr <shawn.starr-bJEeYj9oJeDQT0dZR+AlfA@public.gmane.org> ---
This isn't just dual screen, I confirm this happening on single screen also
with 4.10 kernel.

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[Bug 99841] Switching to VT freezes X only on a dual screen

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ]

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https://bugs.freedesktop.org/show_bug.cgi?id=99841

Michel Dänzer <michel-otUistvHUpPR7s880joybQ@public.gmane.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
          Component|Driver/nouveau              |DRM/other
            Product|xorg                        |DRI
         QA Contact|xorg-team-go0+a7rfsptAfugRpC6u6w@public.gmane.org       |
           Assignee|nouveau-PD4FTy7X32lNgt0PjOBp93rCq3LdnpKM@public.gmane.org |dri-devel-PD4FTy7X32lNgt0PjOBp93gSJqDPrsil@public.gmane.org
                   |rg                          |.org

--- Comment #9 from Michel Dänzer <michel-otUistvHUpPR7s880joybQ@public.gmane.org> ---
This also happens with other drivers, seems to be a core DRM issue.

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[Bug 99841] Switching to VT freezes X only on a dual screen

[bugzilla-daemon]

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https://bugs.freedesktop.org/show_bug.cgi?id=99841

mattia.b89 <mattia.b89@gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |FIXED
             Status|NEW                         |RESOLVED

--- Comment #23 from mattia.b89 <mattia.b89@gmail.com> ---
I cannot reproduce it.

That patch has already been merged upstream, maybe?

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[Bug 99841] Switching to VT freezes X only on a dual screen

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https://bugs.freedesktop.org/show_bug.cgi?id=99841

Elimar Riesebieter <riesebie@lxtec.de> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |riesebie@lxtec.de

--- Comment #22 from Elimar Riesebieter <riesebie@lxtec.de> ---
I am running 4.10.6 patched with Michel's patch. There are no problems
switching to vt's and back.

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[Bug 99841] Switching to VT freezes X only on a dual screen

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https://bugs.freedesktop.org/show_bug.cgi?id=99841

--- Comment #21 from Michel Dänzer <michel@daenzer.net> ---
If people are okay with that before it lands in 4.10.y, sure.

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[Bug 99841] Switching to VT freezes X only on a dual screen

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[-- Attachment #1.1: Type: text/plain, Size: 534 bytes --]

https://bugs.freedesktop.org/show_bug.cgi?id=99841

--- Comment #20 from Jari Tahvanainen <jari.tahvanainen@intel.com> ---
Michel and others - landed to drm-tip. Ready for resolved+fixed ? Or even
verified...
commit 12ffed96d4369f086261ba2ee734fa8c932d7f55
Author:     Michel Dänzer <michel.daenzer@amd.com>
AuthorDate: Thu Mar 23 17:53:26 2017 +0900
Commit:     Daniel Vetter <daniel.vetter@ffwll.ch>
CommitDate: Thu Mar 23 15:12:07 2017 +0100

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[Bug 99841] Switching to VT freezes X only on a dual screen

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[-- Attachment #1.1: Type: text/plain, Size: 387 bytes --]

https://bugs.freedesktop.org/show_bug.cgi?id=99841

--- Comment #19 from Peter Mattern <pmattern@arcor.de> ---
The patch is fixing the problem on an ATI system as well here (Radeon HD 7480D
/ APU A4-5300, Arch Linux, kernel 4.10.{1-3}).

Is there any way to track when it will be included in mainline?

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[Bug 99841] Switching to VT freezes X only on a dual screen

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https://bugs.freedesktop.org/show_bug.cgi?id=99841

--- Comment #18 from Joseph Thommes <joseph-thommes@gmx.de> ---
The patch also solves the problem for me on 4.10.2-gentoo.
Thank You.

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[Bug 99841] Switching to VT freezes X only on a dual screen

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https://bugs.freedesktop.org/show_bug.cgi?id=99841

--- Comment #17 from Elimar Riesebieter <riesebie@lxtec.de> ---
Thanks Michel for your efforts. Hereby I confirm that your patch against 4.11
works fine as well ;-)

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[Bug 99841] Switching to VT freezes X only on a dual screen

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https://bugs.freedesktop.org/show_bug.cgi?id=99841

--- Comment #16 from Michel Dänzer <michel@daenzer.net> ---
Created attachment 130227
  --> https://bugs.freedesktop.org/attachment.cgi?id=130227&action=edit
Patch for 4.11

Here's the corresponding patch for 4.11. Elimar, please test this as well.

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[Bug 99841] Switching to VT freezes X only on a dual screen

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https://bugs.freedesktop.org/show_bug.cgi?id=99841

--- Comment #15 from Elimar Riesebieter <riesebie@lxtec.de> ---
The patch applied to 4.10.2 works just fine. Applying to 4.11-rc2 gives a
compile error:

drivers/gpu/drm/drm_fb_helper.c: In function ‘drm_fb_helper_check_var’:         
  drivers/gpu/drm/drm_fb_helper.c:1263:32: error: ‘struct drm_framebuffer’ has
no member named ‘bits_per_pixel’
        (var->bits_per_pixel != fb->bits_per_pixel ||
                                  ^~
make[5]: *** [drivers/gpu/drm/drm_fb_helper.o] Error 1

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[Bug 99841] Switching to VT freezes X only on a dual screen

[bugzilla-daemon]

[-- Attachment #1.1: Type: text/plain, Size: 269 bytes --]

https://bugs.freedesktop.org/show_bug.cgi?id=99841

--- Comment #14 from kevin@potatofrom.space ---
The patch indeed solves the issue -- VTs work on Linux 4.10.1 with the patch
applied.

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[Bug 99841] Switching to VT freezes X only on a dual screen

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https://bugs.freedesktop.org/show_bug.cgi?id=99841

--- Comment #13 from Michel Dänzer <michel@daenzer.net> ---
Created attachment 130207
  --> https://bugs.freedesktop.org/attachment.cgi?id=130207&action=edit
Only reject if FBINFO_MISC_USEREVENT is set

Does this patch (only compile tested) help?

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[Bug 99841] Switching to VT freezes X only on a dual screen

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https://bugs.freedesktop.org/show_bug.cgi?id=99841

--- Comment #12 from prg@cooco.de ---
# bad: [7ce7d89f48834cefece7804d38fc5d85382edf77] Linux 4.10-rc1
# good: [69973b830859bc6529a7a0468ba0d80ee5117826] Linux 4.9
git bisect start 'v4.10-rc1' 'v4.9'
# bad: [72cca7baf4fba777b8ab770b902cf2e08941773f] Merge tag 'staging-4.10-rc1'
of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging
git bisect bad 72cca7baf4fba777b8ab770b902cf2e08941773f
# good: [b8d2798f32785398fcd1c48ea80c0c6c5ab88537] Merge tag 'clk-for-linus' of
git://git.kernel.org/pub/scm/linux/kernel/git/clk/linux
git bisect good b8d2798f32785398fcd1c48ea80c0c6c5ab88537
# bad: [9439b3710df688d853eb6cb4851256f2c92b1797] Merge tag 'drm-for-v4.10' of
git://people.freedesktop.org/~airlied/linux
git bisect bad 9439b3710df688d853eb6cb4851256f2c92b1797
# bad: [628d16555e019c0cc6897b603bbea29c3b6d2c9f] Merge tag
'imx-drm-next-2016-11-10' of git://git.pengutronix.de/git/pza/linux into
drm-next
git bisect bad 628d16555e019c0cc6897b603bbea29c3b6d2c9f
# bad: [3f767e3d076dd2a24a614917c8f0b05d8d82b90b] drm/amdgpu: just not load smc
firmware if smu is already running
git bisect bad 3f767e3d076dd2a24a614917c8f0b05d8d82b90b
# good: [bf9d99ad17ff3d85dc8c807063f76560587d983a] drm/i915/gen9: Make
skl_pipe_wm_get_hw_state() reusable
git bisect good bf9d99ad17ff3d85dc8c807063f76560587d983a
# bad: [9405e47dbab33706c43caba72cf8d83b5746f843] drm/amdgpu/virtual_dce: clean
up interrupt handling
git bisect bad 9405e47dbab33706c43caba72cf8d83b5746f843
# bad: [d138dd3c0c70979215f3184cf36f95875e37932e] drm: Add support for optional
per-plane rotation property
git bisect bad d138dd3c0c70979215f3184cf36f95875e37932e
# bad: [9edbf1fa600a2ef17c7553c2103d0055d0320d15] drm: Add API for capturing
frame CRCs
git bisect bad 9edbf1fa600a2ef17c7553c2103d0055d0320d15
# good: [f7741aa75e76440f4e9ecfe512feebe9bce33ca8] drm/savage: dereferencing an
error pointer
git bisect good f7741aa75e76440f4e9ecfe512feebe9bce33ca8
# good: [6dffd431e2296cda08e7e4f0242e02df1d1698cd] drm: Add aspect ratio
parsing in DRM layer
git bisect good 6dffd431e2296cda08e7e4f0242e02df1d1698cd
# good: [f14f368670541bfa217573194027a58f2206e250] drm/edid: Rename local
variable block to edid
git bisect good f14f368670541bfa217573194027a58f2206e250
# bad: [865afb11949e5bf4bb32d9a2aa9867c1ac4d8da0] drm/fb-helper: reject any
changes to the fbdev
git bisect bad 865afb11949e5bf4bb32d9a2aa9867c1ac4d8da0
# good: [a28187ccab9410cad20e8808f00cfc07f99649c3] drm/edid: Use block local to
refer to the block
git bisect good a28187ccab9410cad20e8808f00cfc07f99649c3
# first bad commit: [865afb11949e5bf4bb32d9a2aa9867c1ac4d8da0] drm/fb-helper:
reject any changes to the fbdev

(Tested on a GTX660/GK106)

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[Bug 99841] Switching to VT freezes X only on a dual screen

[bugzilla-daemon]

[-- Attachment #1.1: Type: text/plain, Size: 251 bytes --]

https://bugs.freedesktop.org/show_bug.cgi?id=99841

--- Comment #11 from Michel Dänzer <michel@daenzer.net> ---
Somebody needs to bisect this between 4.9 and 4.10-rc1.

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[Bug 99841] Switching to VT freezes X only on a dual screen

[bugzilla-daemon]

[-- Attachment #1.1: Type: text/plain, Size: 229 bytes --]

https://bugs.freedesktop.org/show_bug.cgi?id=99841

--- Comment #10 from Elimar Riesebieter <riesebie@lxtec.de> ---
There is no change in 4.11-rc1

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[Bug 99841] Switching to VT freezes X only on a dual screen

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[-- Attachment #1.1: Type: text/plain, Size: 744 bytes --]

https://bugs.freedesktop.org/show_bug.cgi?id=99841

Michel Dänzer <michel@daenzer.net> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
          Component|Driver/nouveau              |DRM/other
            Product|xorg                        |DRI
         QA Contact|xorg-team@lists.x.org       |
           Assignee|nouveau@lists.freedesktop.o |dri-devel@lists.freedesktop
                   |rg                          |.org

--- Comment #9 from Michel Dänzer <michel@daenzer.net> ---
This also happens with other drivers, seems to be a core DRM issue.

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