[Bug 99505] New: Attempting to reclock GeForce GT740M (GK208) cause GPU and system to hang

[bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ@public.gmane.org]

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https://bugs.freedesktop.org/show_bug.cgi?id=99505

            Bug ID: 99505
           Summary: Attempting to reclock GeForce GT740M (GK208) cause GPU
                    and system to hang
           Product: xorg
           Version: unspecified
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/nouveau
          Assignee: nouveau-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org
          Reporter: stu_dby-KN7UnAbNpbg@public.gmane.org
        QA Contact: xorg-team-go0+a7rfsptAfugRpC6u6w@public.gmane.org

Created attachment 129107
  --> https://bugs.freedesktop.org/attachment.cgi?id=129107&action=edit
The dmesg output after reclocking

When I tried to reclock the GT740M (the GK208 one) on my laptop with:
# echo "07" > /sys/kernel/debug/dri/1/pstate
The shell process in which I enter the command became unkillable (state D+ in
ps) and the GPU would hang (rendering stops). Attempting to shutdown the
computer would completely freeze the system, only force reset can be used.

My computer is an Thinkpad E431 laptop running Arch Linux, kernel version is
4.8.13-1-ARCH

Output of lspci:
00:00.0 Host bridge: Intel Corporation 3rd Gen Core processor DRAM Controller
(rev 09)
00:01.0 PCI bridge: Intel Corporation Xeon E3-1200 v2/3rd Gen Core processor
PCI Express Root Port (rev 09)
00:02.0 VGA compatible controller: Intel Corporation 3rd Gen Core processor
Graphics Controller (rev 09)
00:14.0 USB controller: Intel Corporation 7 Series/C210 Series Chipset Family
USB xHCI Host Controller (rev 04)
00:16.0 Communication controller: Intel Corporation 7 Series/C216 Chipset
Family MEI Controller #1 (rev 04)
00:1a.0 USB controller: Intel Corporation 7 Series/C216 Chipset Family USB
Enhanced Host Controller #2 (rev 04)
00:1b.0 Audio device: Intel Corporation 7 Series/C216 Chipset Family High
Definition Audio Controller (rev 04)
00:1c.0 PCI bridge: Intel Corporation 7 Series/C216 Chipset Family PCI Express
Root Port 1 (rev c4)
00:1c.1 PCI bridge: Intel Corporation 7 Series/C210 Series Chipset Family PCI
Express Root Port 2 (rev c4)
00:1c.3 PCI bridge: Intel Corporation 7 Series/C216 Chipset Family PCI Express
Root Port 4 (rev c4)
00:1d.0 USB controller: Intel Corporation 7 Series/C216 Chipset Family USB
Enhanced Host Controller #1 (rev 04)
00:1f.0 ISA bridge: Intel Corporation HM77 Express Chipset LPC Controller (rev
04)
00:1f.2 SATA controller: Intel Corporation 7 Series Chipset Family 6-port SATA
Controller [AHCI mode] (rev 04)
00:1f.3 SMBus: Intel Corporation 7 Series/C216 Chipset Family SMBus Controller
(rev 04)
01:00.0 3D controller: NVIDIA Corporation GK208M [GeForce GT 740M] (rev a1)
03:00.0 Unassigned class [ff00]: Realtek Semiconductor Co., Ltd. RTS5229 PCI
Express Card Reader (rev 01)
04:00.0 Network controller: Broadcom Limited BCM43228 802.11a/b/g/n
05:00.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL8111/8168/8411
PCI Express Gigabit Ethernet Controller (rev 07)

Output of /sys/kernel/debug/dri/1/pstate before reclocking:
07: core 405 MHz memory 810 MHz
0a: core 405-1058 MHz memory 1620 MHz
0f: core 405-1058 MHz memory 2002 MHz
AC: core 0 MHz memory 0 MHz

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