[Bug 97396] [drm] stuck on bsd ring (bisected)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=97396

--- Comment #11 from Jay <mymailclone at t-online.de> ---
I was just experiencing a problem after resume from s2disk: frozen windows,
missing titlebars, only partly rendered windows, keyboard not working. Could
solve it with log out/in but had to shoot a VM. Kernel was 4.4.18.

Among some of the new messages in dmesg (see new attachm.) :

...
[drm] stuck on render ring
[drm] GPU HANG: ecode 5:0:0xfdffffff, in Xorg [1183], reason: Ring hung,
action: reset
i915 0000:00:02.0: GEM idle failed, resume might fail
pci_pm_freeze(): i915_pm_suspend+0x0/0x40 [i915] returns -11
dpm_run_callback(): pci_pm_freeze+0x0/0xe0 returns -11
PM: Device 0000:00:02.0 failed to freeze async: error -11
drm/i915: Resetting chip after gpu hang
...

Seems more serious than I first thought. 

@Chris: Could you give me a hint concerning the patch that you mentioned in
your post? I could give it a try. Or is it a whole bunch? In that case I'd
rather wait until they are integrated in 4.8 (in git I have 4.8-rc2 and that
doesn't seem to have the patches for this problem).

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