[Intel-gfx] drm stuck on render ring starting xlock on a x201 using SNA

[Charles Devereaux]

Hello

Aftertrying to leave an xlock started with  xlock -nolock +use3d -mode
gears, I get a drm stuck on render ring error.

The funny thing is this problem did not happen on the exact same thinkpad
x201 laptop using an identical xorg.conf but with a debian jessie i386  (I
did a clean reinstall of debian jessie amd64)

xorg.conf contains:
Section "Device"
    Identifier  "i950"
    Driver      "intel"
    BusID       "PCI:0:2:0"
    Screen 0
    Option    "AccelMethod"    "SNA"
    Option  "FallbackDebug" "true"
EndSection

I'm using kernel  3.14.25, and I saved /sys/class/drm/card0/error and
gpucrash in case it's not a know bug.

Any suggestion?

[    0.396228] [drm] Initialized drm 1.1.0 20060810
[    0.396870] [drm] Memory usable by graphics device = 2048M
[    0.405464] i915 0000:00:02.0: irq 43 for MSI/MSI-X
[    0.405480] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
[    0.405483] [drm] Driver supports precise vblank timestamp query.
[    0.405586] vgaarb: device changed decodes:
PCI:0000:00:02.0,olddecodes=io+mem,decodes=io+mem:owns=io+mem
[    0.408539] ACPI: Battery Slot [BAT0] (battery present)
[    0.460085] [drm] Enabling RC6 states: RC6 off, RC6p off, RC6pp off
[    0.471385] fbcon: inteldrmfb (fb0) is primary device
(...)
[    1.077765] [drm] Initialized i915 1.6.0 20080730 for 0000:00:02.0 on
minor 0
(...)
[  207.574130] [drm] stuck on render ring
[  207.574149] [drm] GPU crash dump saved to /sys/class/drm/card0/error
[  207.574152] [drm] GPU hangs can indicate a bug anywhere in the entire
gfx stack, including userspace.
[  207.574154] [drm] Please file a _new_ bug report on bugs.freedesktop.org
against DRI -> DRM/Intel
[  207.574155] [drm] drm/i915 developers can then reassign to the right
component if it's not a kernel issue.
[  207.574157] [drm] The gpu crash dump is required to analyze gpu hangs,
so please always attach it.
[  207.581041] [drm:init_ring_common] *ERROR* failed to set render ring
head to zero ctl 00000000 head 008014dc tail 00000000 start 00003000
[  207.632121] [drm:init_ring_common] *ERROR* render ring initialization
failed ctl 0001f001 head 008014dc tail 00000000 start 00003000
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