[Bug 211807] New: [drm:drm_dp_mst_dpcd_read] *ERROR* mstb 000000004e6288dd port 3: DPCD read on addr 0x60 for 1 bytes NAKed

[Bug 211807] New: [drm:drm_dp_mst_dpcd_read] *ERROR* mstb 000000004e6288dd port 3: DPCD read on addr 0x60 for 1 bytes NAKed

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=211807

            Bug ID: 211807
           Summary: [drm:drm_dp_mst_dpcd_read] *ERROR* mstb
                    000000004e6288dd port 3: DPCD read on addr 0x60 for 1
                    bytes NAKed
           Product: Drivers
           Version: 2.5
    Kernel Version: 5.10.16
          Hardware: All
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: low
          Priority: P1
         Component: Video(DRI - non Intel)
          Assignee: drivers_video-dri@kernel-bugs.osdl.org
          Reporter: kernelbugs@equaeghe.nospammail.net
        Regression: No

In my logs, I see the following error:


[drm:drm_dp_mst_dpcd_read] *ERROR* mstb 000000004e6288dd port 3: DPCD read on
addr 0x60 for 1 bytes NAKed


It has not caused any detected issues, but I guess that if the kernel complains
this loudy, it is good to report it.

This is on a laptop with a Ryzen Pro 4750U APU. I custom-build the kernel, so
do not hesitate to request changing some config options to investigate.

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[Bug 211807] [drm:drm_dp_mst_dpcd_read] *ERROR* mstb 000000004e6288dd port 3: DPCD read on addr 0x60 for 1 bytes NAKed

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=211807

naon@disroot.org changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |naon@disroot.org

--- Comment #1 from naon@disroot.org ---
I have just discovered after months of searching that I recieve this same
error. I have a desktop computer than uses both a AMD WX3100 and a AMD RX570.
When I turn off my monitor connected to either of my graphics cards (an
effective hotplug), then turn my monitor back on, I recieve the error

[drm:drm_dp_mst_dpcd_read [drm_kms_helper]] *ERROR* mstb 000000008ff61da7 port
8: DPCD read on addr 0x60 for 1 bytes NAKed

xorg crashes, I recieve the message

[drm:drm_dp_check_act_status [drm_kms_helper]] *ERROR* Failed to get ACT after
3000ms, last status: 01

and it takes up to 40 seconds for display of the vt to resume. The longer the
monitor remains off, the higher the chance that display of the vt will never
resume after the monitor is turned on, needing a hard restart. This error has
persisted for about 3 months, ever since i've first installed linux on this
computer, on every kernel variation and build I have tried to date. Currently
reproduceable on 5.11.16.

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[Bug 211807] [drm:drm_dp_mst_dpcd_read] *ERROR* mstb 000000004e6288dd port 3: DPCD read on addr 0x60 for 1 bytes NAKed

[bugzilla-daemon]

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pavol.harar@gmail.com changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |pavol.harar@gmail.com

--- Comment #2 from pavol.harar@gmail.com ---
I am experiencing the aforementioned error as well.

[drm:drm_dp_mst_dpcd_read [drm_kms_helper]] *ERROR* mstb 00000000f00db6df port
0: DPCD read on addr 0x4b0 for 1 bytes NAKed

I have problems connecting my ThinkPad X1 Carbon 7gen to two external DP
monitors via a ThinkPad USB-C gen2 docking station. Linux is not officially
supported for this dock unfortunately. The problem is that the monitors work,
but seemingly randomly they stop working, either I try to go to Ubuntu settings
or try to open some program with a keyboard shortcut. The monitors flicker,
then die and I have to reboot. Sometimes just reconnecting the cable works, but
usually not. Sometimes when I connect my phone to the dock the monitors start
working again, but most often not. There is a lot of people having these
problems but I have not found any solution. In dmseg only this error appears. I
am to the best of my knowledge up to date with everything, kernel, bios,
firmware etc.

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[Bug 211807] [drm:drm_dp_mst_dpcd_read] *ERROR* mstb 000000004e6288dd port 3: DPCD read on addr 0x60 for 1 bytes NAKed

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Nils Tonnätt (nils.tonnaett@posteo.de) changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |nils.tonnaett@posteo.de

--- Comment #3 from Nils Tonnätt (nils.tonnaett@posteo.de) ---
Same with Radeon RX5500 and Dell P2815Q display.

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[Bug 211807] [drm:drm_dp_mst_dpcd_read] *ERROR* mstb 000000004e6288dd port 3: DPCD read on addr 0x60 for 1 bytes NAKed

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Parker Reed (parker.l.reed@gmail.com) changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |parker.l.reed@gmail.com

--- Comment #4 from Parker Reed (parker.l.reed@gmail.com) ---
I get full on driver "crashes" when trying two DisplayPort monitors with the
aforementioned ThinkPad USB-C Gen 2 dock (T495 AMD)

I can use either or DisplaPort port but both causes the crashes.

Dmesg attached

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[Bug 211807] [drm:drm_dp_mst_dpcd_read] *ERROR* mstb 000000004e6288dd port 3: DPCD read on addr 0x60 for 1 bytes NAKed

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--- Comment #5 from Parker Reed (parker.l.reed@gmail.com) ---
Created attachment 298847
  --> https://bugzilla.kernel.org/attachment.cgi?id=298847&action=edit
dmesg from 5.14.3

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[Bug 211807] [drm:drm_dp_mst_dpcd_read] *ERROR* mstb 000000004e6288dd port 3: DPCD read on addr 0x60 for 1 bytes NAKed

[bugzilla-daemon]

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--- Comment #6 from Parker Reed (parker.l.reed@gmail.com) ---
Created attachment 298867
  --> https://bugzilla.kernel.org/attachment.cgi?id=298867&action=edit
dmesg 5.14.5

I can reliably get both 1440p monitors working now with pure DP but only at 60
Hz

If I try switching either one to 75 Hz it kills that monitor.

Attached new dmesg

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[Bug 211807] [drm:drm_dp_mst_dpcd_read] *ERROR* mstb 000000004e6288dd port 3: DPCD read on addr 0x60 for 1 bytes NAKed

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Alex Deucher (alexdeucher@gmail.com) changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |alexdeucher@gmail.com

--- Comment #7 from Alex Deucher (alexdeucher@gmail.com) ---
Does this patch help?
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=90517c9838602846daa0feec7b37382fed61b001

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[Bug 211807] [drm:drm_dp_mst_dpcd_read] *ERROR* mstb 000000004e6288dd port 3: DPCD read on addr 0x60 for 1 bytes NAKed

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--- Comment #8 from Parker Reed (parker.l.reed@gmail.com) ---
Just built 5.15 rc1 (master) and I'm hung up right after bootloader. Maybe
someone else can test that patch. I'll be unable to get back around to this
until next week. 

Thanks for the prompt reply.

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[Bug 211807] [drm:drm_dp_mst_dpcd_read] *ERROR* mstb 000000004e6288dd port 3: DPCD read on addr 0x60 for 1 bytes NAKed

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--- Comment #9 from Nils Tonnätt (nils.tonnaett@posteo.de) ---
I've tested 5.15.0-0.rc1.20210917gitbdb575f87217 from Fedora's mainline kernel
repo where this is already applied. But this triggers a segfault in gnome-shell
(even with DP 1.2 turned off):
[   23.621514] gnome-shell[2126]: segfault at 0 ip 0000000000000000 sp
00007ffdc1fa6af8 error 14

I'll try to patch 5.14 now.

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[Bug 211807] [drm:drm_dp_mst_dpcd_read] *ERROR* mstb 000000004e6288dd port 3: DPCD read on addr 0x60 for 1 bytes NAKed

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--- Comment #10 from Nils Tonnätt (nils.tonnaett@posteo.de) ---
I patched 5.14.5. I see now difference in behavior. When the screen stays black
it often works to switch to a tty or turn off and on the display. Dmesg seems
to became a little more verbose about this:

[   64.800268] [drm] DM_MST: stopping TM on aconnector: 000000007957d743 [id:
97]
[   64.820206] amdgpu 0000:09:00.0: [drm] Cannot find any crtc or sizes
[   66.970887] [drm] DM_MST: starting TM on aconnector: 000000007957d743 [id:
97]
[   67.173165] amdgpu 0000:09:00.0: [drm] *ERROR* mstb 00000000ca721b5e port 8:
DPCD read on addr 0x60 for 1 bytes NAKed
[   67.176906] [drm] fb mappable at 0x7C00502000
[   67.176907] [drm] vram apper at 0x7C00000000
[   67.176907] [drm] size 33177600
[   67.176908] [drm] fb depth is 24
[   67.176908] [drm]    pitch is 15360
[   67.176965] fbcon: amdgpu (fb0) is primary device
[   67.192813] amdgpu 0000:09:00.0: [drm] *ERROR* mstb 00000000ca721b5e port 8:
DPCD read on addr 0x60 for 1 bytes NAKed
[   67.670123] Console: switching to colour frame buffer device 480x135
[   67.708683] amdgpu 0000:09:00.0: [drm] fb0: amdgpu frame buffer device
[   72.960002] rfkill: input handler disabled
[   73.139379] amdgpu 0000:09:00.0: [drm] *ERROR* mstb 00000000ca721b5e port 8:
DPCD read on addr 0x60 for 1 bytes NAKed
[   80.216335] rfkill: input handler enabled
[   80.534571] amdgpu 0000:09:00.0: [drm] *ERROR* mstb 00000000ca721b5e port 8:
DPCD read on addr 0x60 for 1 bytes NAKed

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[Bug 211807] [drm:drm_dp_mst_dpcd_read] *ERROR* mstb 000000004e6288dd port 3: DPCD read on addr 0x60 for 1 bytes NAKed

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Matt Berry (matthew.william.berry@gmail.com) changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |matthew.william.berry@gmail
                   |                            |.com

--- Comment #11 from Matt Berry (matthew.william.berry@gmail.com) ---
I'm seeing this when I use my work laptop (HP SKU 3YG73UC) with a Startech DP
KVM (sv231dpu2) on Ubuntu 20.04 (5.11.0-37-generic). It doesn't happen every
time, but when I switch the KVM over I'll hear the fan kick on and when I
switch the KVM back I'll see the following in `dmesg`. Given that it's a work
laptop, I'll have to follow their kernel release cycle, but will report back if
I see it on newer kernels as they roll out.

```
sudo journalctl -b 0 | grep -i firmware | grep i915
Oct 12 14:44:59 u41fc3826021951.ant.amazon.com kernel: i915 0000:00:02.0: [drm]
Finished loading DMC firmware i915/kbl_dmc_ver1_04.bin (v1.4)

sudo dmesg | egrep -vi 'audit|usb |hub |input: '
[941754.942373] [drm:drm_dp_mst_dpcd_read [drm_kms_helper]] *ERROR* mstb
000000003ba372b9 port 1: DPCD read on addr 0x4b0 for 1 bytes NAKed
[941754.964462] [drm:drm_dp_mst_dpcd_read [drm_kms_helper]] *ERROR* mstb
000000003ba372b9 port 3: DPCD read on addr 0x4b0 for 1 bytes NAKed
[941953.993504] [drm:drm_dp_mst_dpcd_read [drm_kms_helper]] *ERROR* mstb
000000003ba372b9 port 3: DPCD read on addr 0x4b0 for 1 bytes NAKed
[942109.330113] loop12: detected capacity change from 0 to 1232
[942125.974833] loop13: detected capacity change from 0 to 337424
[942146.986960] [drm:drm_dp_mst_dpcd_read [drm_kms_helper]] *ERROR* mstb
000000003ba372b9 port 3: DPCD read on addr 0x4b0 for 1 bytes NAKed
[942392.995237] [drm:drm_dp_mst_dpcd_read [drm_kms_helper]] *ERROR* mstb
000000003ba372b9 port 3: DPCD read on addr 0x4b0 for 1 bytes NAKed
[942967.950060] [drm:drm_dp_mst_dpcd_read [drm_kms_helper]] *ERROR* mstb
000000003ba372b9 port 1: DPCD read on addr 0x4b0 for 1 bytes NAKed
[942967.972573] [drm:drm_dp_mst_dpcd_read [drm_kms_helper]] *ERROR* mstb
000000003ba372b9 port 3: DPCD read on addr 0x4b0 for 1 bytes NAKed
[942990.984072] [drm:drm_dp_mst_dpcd_read [drm_kms_helper]] *ERROR* mstb
000000003ba372b9 port 3: DPCD read on addr 0x4b0 for 1 bytes NAKed
[943003.939382] [drm:drm_dp_mst_dpcd_read [drm_kms_helper]] *ERROR* mstb
000000003ba372b9 port 1: DPCD read on addr 0x4b0 for 1 bytes NAKed
[943003.962504] [drm:drm_dp_mst_dpcd_read [drm_kms_helper]] *ERROR* mstb
000000003ba372b9 port 3: DPCD read on addr 0x4b0 for 1 bytes NAKed
[943227.981538] [drm:drm_dp_mst_dpcd_read [drm_kms_helper]] *ERROR* mstb
000000003ba372b9 port 3: DPCD read on addr 0x4b0 for 1 bytes NAKed
[943765.979086] [drm:drm_dp_mst_dpcd_read [drm_kms_helper]] *ERROR* mstb
000000003ba372b9 port 3: DPCD read on addr 0x4b0 for 1 bytes NAKed
[943775.950453] [drm:drm_dp_mst_dpcd_read [drm_kms_helper]] *ERROR* mstb
000000003ba372b9 port 1: DPCD read on addr 0x4b0 for 1 bytes NAKed
[943775.981195] [drm:drm_dp_mst_dpcd_read [drm_kms_helper]] *ERROR* mstb
000000003ba372b9 port 3: DPCD read on addr 0x4b0 for 1 bytes NAKed
[944033.975975] [drm:drm_dp_mst_dpcd_read [drm_kms_helper]] *ERROR* mstb
000000003ba372b9 port 3: DPCD read on addr 0x4b0 for 1 bytes NAKed
[945830.946882] [drm:drm_dp_mst_dpcd_read [drm_kms_helper]] *ERROR* mstb
000000003ba372b9 port 1: DPCD read on addr 0x4b0 for 1 bytes NAKed
[945830.969342] [drm:drm_dp_mst_dpcd_read [drm_kms_helper]] *ERROR* mstb
000000003ba372b9 port 3: DPCD read on addr 0x4b0 for 1 bytes NAKed
[946098.985432] [drm:drm_dp_mst_dpcd_read [drm_kms_helper]] *ERROR* mstb
000000003ba372b9 port 3: DPCD read on addr 0x4b0 for 1 bytes NAKed
[947569.935525] [drm:drm_dp_mst_dpcd_read [drm_kms_helper]] *ERROR* mstb
000000003ba372b9 port 1: DPCD read on addr 0x4b0 for 1 bytes NAKed
[947569.957792] [drm:drm_dp_mst_dpcd_read [drm_kms_helper]] *ERROR* mstb
000000003ba372b9 port 3: DPCD read on addr 0x4b0 for 1 bytes NAKed
[947604.971146] [drm:drm_dp_mst_dpcd_read [drm_kms_helper]] *ERROR* mstb
000000003ba372b9 port 3: DPCD read on addr 0x4b0 for 1 bytes NAKed
```

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[Bug 211807] [drm:drm_dp_mst_dpcd_read] *ERROR* mstb 000000004e6288dd port 3: DPCD read on addr 0x60 for 1 bytes NAKed

[bugzilla-daemon]

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--- Comment #12 from zwerg12@mail.de ---
As mentioned before, I get the same error with a monitor connected with DP to a
Lenovo ThinkPad USB-C Dock Gen2. My Laptop has an Intel i7 10510U no additional
graphics card. I am using Debian testing with the provided kernel.

Furthermore sudo dmesg output says:
[  148.088024] wrong crc01 50 63 ff ff 00 00 00 00 50 63 ff ff 00 00 00
[  148.088028] wrong crc00 04 90 c0 01 00 00 00 00 00 00 00 00 00 00 00
[  148.088029] wrong crc00 00 00 00 95 00 00 00 00 00 00 00 00
[  148.152590] [drm:drm_dp_mst_dpcd_read [drm_kms_helper]] *ERROR* mstb
00000000deb5c7d4 port 1: DPCD read on addr 0x4b0 for 1 bytes NAKed
[  148.182726] [drm:drm_dp_mst_dpcd_read [drm_kms_helper]] *ERROR* mstb
00000000deb5c7d4 port 0: DPCD read on addr 0x4b0 for 1 bytes NAKed
[  148.202439] [drm:drm_dp_mst_dpcd_read [drm_kms_helper]] *ERROR* mstb
00000000deb5c7d4 port 3: DPCD read on addr 0x4b0 for 1 bytes NAKed
[  148.557719] [drm:drm_dp_mst_hpd_irq [drm_kms_helper]] *ERROR* Got unknown
reply 0x00 (GET_MSG_TRANSACTION_VERSION)
[  148.812803] [drm:drm_dp_mst_dpcd_read [drm_kms_helper]] *ERROR* mstb
00000000e591bea5 port 1: DPCD read on addr 0x4b0 for 1 bytes NAKed
[  149.036253] wrong crc80 81 40 95 00 a9 40 b3 00 d1 00 e1 c0 37 38 51
[  149.036257] wrong crc56 0a 20 20 20 20 20 00 00 00 ff 00 4c 35 4c 4d
[  149.036259] wrong crc51 53 31 37 34 34 38 33 0a 01 05 02 00
[  149.119816] wrong crc80 81 40 95 00 a9 40 b3 00 d1 00 e1 c0 37 38 51
[  149.119819] wrong crc56 0a 20 20 20 20 20 00 00 00 ff 00 4c 35 4c 4d
[  149.119821] wrong crc51 53 31 37 34 34 38 33 0a 01 05 02 00
[  149.161970] wrong crc20 20 20 20 20 00 00 00 fc 00 50 41 32 37 38 51
[  149.161973] wrong crc56 0a 20 20 20 20 20 00 00 00 ff 00 4c 00 00 00
[  149.161975] wrong crc00 00 00 00 00 00 00 00 00 00 00 00
[  149.219517] wrong crc80 81 40 95 00 a9 40 b3 00 d1 00 e1 c0 37 38 51
[  149.219520] wrong crc56 0a 20 20 20 20 20 00 00 00 ff 00 4c 35 4c 4d
[  149.219522] wrong crc51 53 31 37 34 34 38 33 0a 01 05 02 00
[  149.248529] wrong crc22 02 80 00 ff ff ff ff ff ff 00 06 b3 56 5e 00
[  149.248532] wrong crca0 a0 a0 29 50 30 20 35 00 55 50 21 00 00 1a 00
[  149.248534] wrong crc00 00 fd 00 2e 4b 70 70 1e 01 0a 20 d3
[  149.357568] [drm:drm_dp_mst_dpcd_read [drm_kms_helper]] *ERROR* mstb
00000000e591bea5 port 3: DPCD read on addr 0x4b0 for 1 bytes NAKed
[  149.386520] wrong crc22 02 80 00 ff ff ff ff ff ff 00 06 b3 00 27 01
[  149.386523] wrong crc01 01 01 16 1e 01 04 a5 3c 22 78 3b ff 00 1a 00
[  149.386524] wrong crc00 00 fd 00 2e 4b 70 70 1e 01 0a 20 d3
[  149.433016] wrong crc80 81 40 95 00 a9 40 b3 00 d1 00 e1 c0 37 38 51
[  149.433019] wrong crc56 0a 20 20 20 20 20 00 00 00 ff 00 4c 35 4c 4d
[  149.433020] wrong crc51 53 31 37 34 34 38 33 0a 01 05 02 00
[  149.452176] wrong crc22 02 80 00 ff ff ff ff ff ff 00 06 b3 00 27 01
[  149.452179] wrong crc01 01 01 16 1e 01 04 a5 3c 22 78 3b ff 00 1a 00
[  149.452180] wrong crc00 00 fd 00 2e 4b 70 70 1e 01 0a 20 d3
[  149.465498] wrong crc80 81 40 95 00 a9 40 b3 00 d1 00 e1 c0 56 5e 00
[  149.465501] wrong crca0 a0 a0 29 50 30 20 35 00 55 50 21 00 35 4c 4d
[  149.465503] wrong crc51 53 31 37 34 34 38 33 0a 01 05 02 00
[  149.476472] i915 0000:00:02.0: [drm] DP-3: EDID is invalid:
[  149.476477]  [00] BAD  00 ff ff ff ff ff ff 00 06 b3 00 27 01 01 01 01
[  149.476479]  [00] BAD  16 1e 01 04 a5 3c 22 78 3b ff 00 1a 00 00 00 fd
[  149.476481]  [00] BAD  00 2e 4b 70 70 1e 01 0a 20 80 81 40 95 00 a9 40
[  149.476483]  [00] BAD  b3 00 d1 00 e1 c0 56 5e 00 a0 a0 a0 29 50 30 20
[  149.476484]  [00] BAD  35 00 55 50 21 00 35 4c 4d 51 53 31 37 34 34 38
[  149.476486]  [00] BAD  33 0a 01 05 02 20 20 20 20 20 00 00 00 fc 00 50
[  149.476487]  [00] BAD  41 32 37 38 51 56 0a 20 20 20 20 20 00 00 00 ff
[  149.476489]  [00] BAD  00 4c 35 4c 4d 51 53 31 37 34 34 38 33 0a 01 05
[  149.533039] wrong crc22 02 80 00 ff ff ff ff ff ff 00 06 b3 56 5e 00
[  149.533042] wrong crca0 a0 a0 29 50 30 20 35 00 55 50 21 00 00 1a 00
[  149.533044] wrong crc00 00 fd 00 2e 4b 70 70 1e 01 0a 20 d3
[  149.698698] wrong crc01 05 6c ff ff 00 00 00 00 05 6c ff ff 00 00 00
[  149.698702] wrong crc00 04 90 c0 01 00 00 00 00 00 00 00 00 00 00 00
[  149.698704] wrong crc00 00 00 00 95 00 00 00 00 00 00 00 00
[  149.732698] [drm:drm_dp_mst_dpcd_read [drm_kms_helper]] *ERROR* mstb
0000000076514e96 port 1: DPCD read on addr 0x4b0 for 1 bytes NAKed
[  149.750841] [drm:drm_dp_mst_dpcd_read [drm_kms_helper]] *ERROR* mstb
0000000076514e96 port 0: DPCD read on addr 0x4b0 for 1 bytes NAKed
[  149.772810] [drm:drm_dp_mst_dpcd_read [drm_kms_helper]] *ERROR* mstb
0000000076514e96 port 3: DPCD read on addr 0x4b0 for 1 bytes NAKed
[  150.080471] failed hdr00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
[  154.083081] [drm:drm_dp_send_link_address [drm_kms_helper]] *ERROR* Sending
link address failed with -5
[  156.605509] [drm:drm_dp_mst_dpcd_read [drm_kms_helper]] *ERROR* mstb
00000000f470192a port 1: DPCD read on addr 0x4b0 for 1 bytes NAKed
[  160.905655] wrong crc22 02 80 00 ff ff ff ff ff ff 00 06 b3 56 5e 00
[  160.905659] wrong crca0 a0 a0 29 50 30 20 35 00 55 50 21 00 00 1a 00
[  160.905661] wrong crc00 00 fd 00 2e 4b 70 70 1e 01 0a 20 d3
[  161.043938] wrong crc80 81 40 95 00 a9 40 b3 00 d1 00 e1 c0 56 5e 00
[  161.043941] wrong crca0 a0 a0 29 50 30 20 35 00 55 50 21 00 35 4c 4d
[  161.043942] wrong crc51 53 31 37 34 34 38 33 0a 01 05 02 00
[  161.355912] wrong crc22 02 80 00 ff ff ff ff ff ff 00 06 b3 00 27 01
[  161.355915] wrong crc01 01 01 16 1e 01 04 a5 3c 22 78 3b ff 00 1a 00
[  161.355916] wrong crc00 00 fd 00 2e 4b 70 70 1e 01 0a 20 d3

During this my notebook monitor is blinking.
This setup worked for around four weeks when suddenly these errors occurred.

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[Bug 211807] [drm:drm_dp_mst_dpcd_read] *ERROR* mstb 000000004e6288dd port 3: DPCD read on addr 0x60 for 1 bytes NAKed

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--- Comment #13 from Alex Deucher (alexdeucher@gmail.com) ---
(In reply to zwerg12 from comment #12)
> As mentioned before, I get the same error with a monitor connected with DP
> to a Lenovo ThinkPad USB-C Dock Gen2. My Laptop has an Intel i7 10510U no
> additional graphics card. I am using Debian testing with the provided kernel.
> 
> 
> During this my notebook monitor is blinking.
> This setup worked for around four weeks when suddenly these errors occurred.


Can you bisect?

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[Bug 211807] [drm:drm_dp_mst_dpcd_read] *ERROR* mstb 000000004e6288dd port 3: DPCD read on addr 0x60 for 1 bytes NAKed

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Daan (daandelombaert@gmail.com) changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |daandelombaert@gmail.com

--- Comment #14 from Daan (daandelombaert@gmail.com) ---
I also had this in my logs yesterday, right before my system locked completely
(had to do a hard reset).

I also have a Lenovo Thinkpad Thunderbolt Dock, which connects my Thinkpad T480
with two external monitors (one Hdmi, one Displayport). I didn't have this
lockup before, in the past both monitors were hdmi so maybe Displayport is the
culprit here?

Exact message:  i915 0000:00:02.0: [drm] *ERROR* mstb 00000000afedfd20 port 3:
DPCD read on addr 0x4b0 for 1 bytes NAKed

Setup: 
Thinkpad T480, i7, UHD Graphics 620 + Nvidia Mx150
Fedora (5.14.16-201.fc34.x86_64)

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[Bug 211807] [drm:drm_dp_mst_dpcd_read] *ERROR* mstb 000000004e6288dd port 3: DPCD read on addr 0x60 for 1 bytes NAKed

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--- Comment #15 from Michel Dänzer (michel@daenzer.net) ---
(In reply to Daan from comment #14)
> I also had this in my logs yesterday, right before my system locked
> completely (had to do a hard reset).

That's probably coincidence. I get these messages on a regular basis, without
any bad behaviour.

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[Bug 211807] [drm:drm_dp_mst_dpcd_read] *ERROR* mstb 000000004e6288dd port 3: DPCD read on addr 0x60 for 1 bytes NAKed

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--- Comment #16 from zwerg12@mail.de ---
(In reply to Alex Deucher from comment #13)
> (In reply to zwerg12 from comment #12)
> > As mentioned before, I get the same error with a monitor connected with DP
> > to a Lenovo ThinkPad USB-C Dock Gen2. My Laptop has an Intel i7 10510U no
> > additional graphics card. I am using Debian testing with the provided
> kernel.
> > 
> > 
> > During this my notebook monitor is blinking.
> > This setup worked for around four weeks when suddenly these errors
> occurred.
> 
> 
> Can you bisect?

I have never done it yet. But as soon as I am at home I can try.

(In reply to Michel Dänzer from comment #15)
> (In reply to Daan from comment #14)
> > I also had this in my logs yesterday, right before my system locked
> > completely (had to do a hard reset).
> 
> That's probably coincidence. I get these messages on a regular basis,
> without any bad behaviour.

Sometimes when I get this message there is no bad behavior but sometimes I also
have to do a hard reset. Without the docking station I never had to make a hard
reset.

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[Bug 211807] [drm:drm_dp_mst_dpcd_read] *ERROR* mstb 000000004e6288dd port 3: DPCD read on addr 0x60 for 1 bytes NAKed

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Chatty (mail@chatty.de) changed:

           What    |Removed                     |Added
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                 CC|                            |mail@chatty.de

--- Comment #17 from Chatty (mail@chatty.de) ---
My setup: MS Surface Book 2 + AOC U2879G6 via Surface Dock via DisplayPort
Tested kernels: 5.10.0 / 5.15.3 / 5.16.0-rc1

When connecting I get random results of:
* monitor remains black
* monitor exhibits 1080p@60 as max resolution
* monitor exhibits 1440p@60 as max resolution
* monitor exhibits 2160p@30 as max resolution
* monitor exhibits 2160p@30 as max resolution <== desired

On boot of 5.16.0-rc1 its initialized with:
> i915 0000:00:02.0: [drm] Finished loading DMC firmware
> i915/kbl_dmc_ver1_04.bin (v1.4)
> [drm] Initialized i915 1.6.0 20201103 for 0000:00:02.0 on minor 0

In the first case I see following dmesg output (black monitor):
> i915 0000:00:02.0: [drm] *ERROR* mstb 0000000009cd3ca6 port 1: DPCD read on
> addr 0x4b0 for 1 bytes NAKed

In the last case I see following dmesg output (despite monitor working):
> i915 0000:00:02.0: [drm] *ERROR* mstb 00000000f4b4c9f1 port 1: DPCD read on
> addr 0x4b0 for 1 bytes NAKed
> i915 0000:00:02.0: [drm] *ERROR* mstb 00000000f4b4c9f1 port 1: DPCD read on
> addr 0x4b0 for 1 bytes NAKed
> i915 0000:00:02.0: [drm] *ERROR* mstb 00000000f4b4c9f1 port 1: DPCD read on
> addr 0x4b0 for 1 bytes NAKed
> i915 0000:00:02.0: [drm] *ERROR* mstb 00000000f4b4c9f1 port 1: DPCD read on
> addr 0x4b0 for 1 bytes NAKed
> i915 0000:00:02.0: [drm] *ERROR* mstb 00000000f4b4c9f1 port 1: DPCD read on
> addr 0x4b0 for 1 bytes NAKed

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[Bug 211807] [drm:drm_dp_mst_dpcd_read] *ERROR* mstb 000000004e6288dd port 3: DPCD read on addr 0x60 for 1 bytes NAKed

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Renaud R. (kernelorg@iopsthecloud.com) changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |kernelorg@iopsthecloud.com

--- Comment #18 from Renaud R. (kernelorg@iopsthecloud.com) ---
My setup:
* Latitude E5570 via dock DisplayPort
* Kernel: https://bugzilla.kernel.org

I randomly have blackscreen and I see in my logs (dmesg):
* i915 0000:00:02.0: [drm] *ERROR* mstb 00000000adcef9b1 port 1: DPCD read on
addr 0x4b0 for 1 bytes NAKed
* [38971.851918] i915 0000:00:02.0: [drm] *ERROR* mstb 00000000adcef9b1 port 1:
DPCD read on addr 0x4b0 for 1 bytes NAKed

My laptop was reinstall from and old ubuntu 18.04 to 20.04. I can't remember
the kernel used in Unbuntu 18.04 but I didn't have this issue.

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--- Comment #19 from Renaud R. (kernelorg@iopsthecloud.com) ---
(In reply to Renaud R. from comment #18)
> My setup:
> * Latitude E5570 via dock DisplayPort
> * Kernel: https://bugzilla.kernel.org


Kernel: 5.15.7-051507-generic #202112080459 SMP

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[Bug 211807] [drm:drm_dp_mst_dpcd_read] *ERROR* mstb 000000004e6288dd port 3: DPCD read on addr 0x60 for 1 bytes NAKed

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notsyncing (song.fc@gmail.com) changed:

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                 CC|                            |song.fc@gmail.com

--- Comment #20 from notsyncing (song.fc@gmail.com) ---
I also have this on my laptop, using a USB-C to 3xHDMI adapter with 3 monitors.
When I unplug and replug it, sometimes the screen will freeze and I have to
force reboot.

log shows:

i915 0000:00:02.0: [drm] *ERROR* mstb 00000000c152fe9e port 1: DPCD read on
addr 0x4b0 for 1 bytes NAKed
i915 0000:00:02.0: [drm] *ERROR* mstb 00000000c152fe9e port 2: DPCD read on
addr 0x4b0 for 1 bytes NAKed

The machine also dies when resuming from suspend with the adapter plugged in,
but I could not get any log, just guessing it might be the same issue.

my setup:

HP Envy 13 ad110tu (i5-8250U, UHD 620)
Archlinux with kernel 5.16.13-arch1-1 x86_64, KDE Plasma 5.24.3 on Wayland

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Fiona Buckner (pheonix991@gmail.com) changed:

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                 CC|                            |pheonix991@gmail.com

--- Comment #21 from Fiona Buckner (pheonix991@gmail.com) ---
Seeing this on Ubuntu 22.04 pre-release. Ubuntu Kernel 5.15.0-23-generic.

> # dmesg | grep i915
> [    1.776895] i915 0000:00:02.0: [drm] VT-d active for gfx access
> [    1.776899] fb0: switching to i915 from EFI VGA
> [    1.776936] i915 0000:00:02.0: vgaarb: deactivate vga console
> [    1.780003] i915 0000:00:02.0: vgaarb: changed VGA decodes:
> olddecodes=io+mem,decodes=io+mem:owns=io+mem
> [    1.780279] i915 0000:00:02.0: [drm] Finished loading DMC firmware
> i915/kbl_dmc_ver1_04.bin (v1.4)
> [    2.675796] i915 0000:00:02.0: [drm] [ENCODER:113:DDI C/PHY C] is
> disabled/in DSI mode with an ungated DDI clock, gate it
> [    2.681117] i915 0000:00:02.0: [drm] [ENCODER:120:DDI D/PHY D] is
> disabled/in DSI mode with an ungated DDI clock, gate it
> [    3.015399] [drm] Initialized i915 1.6.0 20201103 for 0000:00:02.0 on
> minor 0
> [    3.068397] fbcon: i915drmfb (fb0) is primary device
> [    3.427857] i915 0000:00:02.0: [drm] fb0: i915drmfb frame buffer device
> [   25.814835] snd_hda_intel 0000:00:1f.3: bound 0000:00:02.0 (ops
> i915_audio_component_bind_ops [i915])
> [   26.218387] mei_hdcp 0000:00:16.0-b638ab7e-94e2-4ea2-a552-d1c54b627f04:
> bound 0000:00:02.0 (ops i915_hdcp_component_ops [i915])
> [   52.090727] mei_hdcp 0000:00:16.0-b638ab7e-94e2-4ea2-a552-d1c54b627f04:
> bound 0000:00:02.0 (ops i915_hdcp_component_ops [i915])
> [   84.800055] i915 0000:00:02.0: [drm] *ERROR* mstb 000000000a940675 port 2:
> DPCD read on addr 0x4b0 for 1 bytes NAKed
> [   84.811156] i915 0000:00:02.0: [drm] *ERROR* mstb 000000000a940675 port 3:
> DPCD read on addr 0x4b0 for 1 bytes NAKed
> [ 4814.933704] audit: type=1400 audit(1649342645.891:72): apparmor="DENIED"
> operation="open" profile="snap.chromium.chromium"
> name="/proc/sys/dev/i915/perf_stream_paranoid" pid=44648 comm="chrome"
> requested_mask="r" denied_mask="r" fsuid=1000 ouid=0
> [ 7139.378349] i915 0000:00:02.0: [drm] *ERROR* mstb 000000000a940675 port 2:
> DPCD read on addr 0x4b0 for 1 bytes NAKed
> [ 7139.388678] i915 0000:00:02.0: [drm] *ERROR* mstb 000000000a940675 port 3:
> DPCD read on addr 0x4b0 for 1 bytes NAKed

Dell 
CPU: Intel® Core™ i7-9750H CPU @ 2.60GHz × 12 
GPU: Quadro T1000/PCIe/SSE2 / Quadro T1000/PCIe/SSE2
(forcing the Nvidia gpu through Nvidia Optimus because the Intel igpu isn't
enough for dual 4k monitors)
Dell WD19TB dock connected to the USBC Thunderbolt port.
2x HP z27 monitors. One connected to the USBC port on the dock, the other to
the Display Port.

Researching this error, I found this thread:
https://lists.freedesktop.org/archives/dri-devel/2022-February/342776.html

> This is normal (although not great TBH, I'm not sure we should be printing an
> error message for that), it's the result of fwupd trying to probe the MST hub
> to see if it's a specific Dell dock that can receive updates over DP aux, but
> it's not smart enough to know it doesn't need to poke the DP aux ranges of
> downstream branches or non-MST ports in general.
> Would definitely accept patches to make this a non-error, or at least make
> this a non-error when the read/writes come from userspace
- Lyude Paul

It might be good to speak with Lyude about it as she might be the expert on it.
 I hope this helps.

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crptdngl71@gmx.net changed:

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                 CC|                            |crptdngl71@gmx.net

--- Comment #22 from crptdngl71@gmx.net ---
I have the same issue. I have found a way to trigger issue quite reliably.

Operating System: Debian GNU/Linux
KDE Plasma Version: 5.25.3
KDE Frameworks Version: 5.94.0
Qt Version: 5.15.4
Kernel Version: 5.18.12-1-siduction-amd64 (64-bit)
Graphics Platform: X11
Processors: 4 × Intel® Core™ i7-6600U CPU @ 2.60GHz
Memory: 7.7 GiB of RAM
Graphics Processor: Mesa Intel® HD Graphics 520
Manufacturer: Dell Inc.
Product Name: Latitude E7470
I am using an external DELL monitor running @2560x1600 pixel @60Hz via
DisplayPort connection. Notebook lid is closed.
==> This system works really stable with no issues for most of time, apart from
the black screen that is described here.

While at first it seemed the issue occurs randomly and more or less seldom, I
finally have found a website that almost always triggers this issue. It occurs
that often now, that it even is not logged in dmesg all times.

Unfortumately, to reproduce the issue, you need to have an account at website
http://www.spinchat.de (there is an English version as well, if that should
matter to you).

How to replicate issue:
(1) Log into spinchat.
(2) Use spinchat as one would normally do, i.e. create an account if you do not
have one, create user name, log into standard server, enter any chat room, open
dialogue window with any chat buddy.

(3) Spinchat rooms have a kind of menu bar with soft buttons at bottom of
screen labelled "Hauptseite" ("Main Site", always visible), and a number of
room names and chat person buddy names. They are simply small rectangular boxes
with another room name, main site access, chat buddy nick name. You can hover
mouse arrow over them and mouse icon will become a hand etc.

(4) BUG, happens with this website always when I use it, sometimes it won't
show, sometimes it shows several times consecutively.
==> While in a chat room, hover mouse cursor over menu icon "Hauptseite" or
another room name menu icon button, or another chat person menu icon button.
The mouse button changes to a hand and after that screen becomes dark. issue
triggered.
==> This does not always happen.
==> This happens in many many cases, it happens way too often to say it is
unrelated to black screen issue.
==> Sometimes black screen is seen for several seconds until it wakes up,
sometimes it is very briefly.
==> Sometimes dmesg gets an extra log entry, mostly it does not after it has
been logged once or a few times.
==> Issue is triggered while only hovering mouse over soft menu key buttons and
also when actively pressing mouse button over such a soft menu key button.

This really is an annoying error and it has been around for such a long time I
wonder why it could not yet be fixed.

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--- Comment #23 from crptdngl71@gmx.net ---
Further details:
After logging into spinchat the issue does not occur straight away. It takes a
bit, use all buttons a while.

This seems to suggest that the issue is related to a memory buffer that leaks
somehow or gets corrupted, because after that has been reached the issue occurs
more frequently.

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