Created attachment 133816 [details]
/sys/class/drm/card0/error (requested by syslog message)

I'm using debian jessie with uptodate packages.
It is the second time that IGP is crashing during the wallpaper.
Wallpaper was active long time before crash.
I hope that the attached dump will be useful.

   * What led up to the situation?
maybe the wallpaper, but I don't really believe it
   * What exactly did you do (or not do) that was effective (or
     ineffective)?
nothing
   * What outcome did you expect instead?
I'm expecting no crash

I'm using intel core i5-7600 with 4k@60Hz desktop.

syslog extract :
Aug 26 21:02:40 lemon kernel: [23694.914814] [drm] GPU HANG: ecode 9:0:0xfffffffe, in Xorg [738], reason: Hang on render ring, action: reset
Aug 26 21:02:40 lemon kernel: [23694.914817] [drm] GPU hangs can indicate a bug anywhere in the entire gfx stack, including userspace.
Aug 26 21:02:40 lemon kernel: [23694.914818] [drm] Please file a _new_ bug report on bugs.freedesktop.org against DRI -> DRM/Intel
Aug 26 21:02:40 lemon kernel: [23694.914819] [drm] drm/i915 developers can then reassign to the right component if it's not a kernel issue.
Aug 26 21:02:40 lemon kernel: [23694.914820] [drm] The gpu crash dump is required to analyze gpu hangs, so please always attach it.
Aug 26 21:02:40 lemon kernel: [23694.914821] [drm] GPU crash dump saved to /sys/class/drm/card0/error
Aug 26 21:02:40 lemon kernel: [23694.914873] drm/i915: Resetting chip after gpu hang
Aug 26 21:02:40 lemon kernel: [23694.914933] [drm] RC6 on
Aug 26 21:02:40 lemon kernel: [23694.930508] [drm] GuC firmware load skipped
Aug 26 21:02:52 lemon kernel: [23706.914579] drm/i915: Resetting chip after gpu hang
Aug 26 21:02:52 lemon kernel: [23706.914640] [drm] RC6 on
Aug 26 21:02:52 lemon kernel: [23706.929619] [drm] GuC firmware load skipped

xorg conf:
Section "Device"
        Identifier  "Intel_HD_Graphics_630"
        Driver      "intel"
        BusID       "PCI:0:2:0"
        Option      "AccelMethod"   "sna"
        Option      "TearFree"   "true"
        Option      "VSync"   "true"
EndSection