[Bug 81710] after Kernel Update to 3.15.6-40.2.gfdb2dde i915 G850 GPU HANG: ecode 0:0xf4e9fffe, in Xorg [698], reason: Ring hung, action: reset

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=81710

--- Comment #6 from Chris Wilson <chris at chris-wilson.co.uk> ---
(In reply to comment #3)
> booting with i915.semaphores=1 doesn't solve the problem

No, i915.semaphores=0 would. Well that's a guess since you didn't follow:

[drm] The gpu crash dump is required to analyze gpu hangs, so please always
attach it.
[drm] GPU crash dump saved to /sys/class/drm/card0/error

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