[Bug 76554] [gm45] [drm:init_ring_common]: *ERROR* render ring initialization failed

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=76554

--- Comment #107 from Jan Niggemann <jn at hz6.de> ---
I applied Jiris patch (attachment 104224) against a vanilla 3.16.3 and I can
confirm that it mitigates the issue. I see no more "render ring initialization
failed" errors, but there seem to be side effects, at least on my Thinkpad T400
(GM45, Debian stable).

I noticed that mouse movement becomes sluggish (without applications open,
didn't find the reason) and as a showstopper, my whole system froze. I coudn't
get out of X with ctrl-alt-backspace, and when I tried to switch to tty1 I
briefly saw a stack dump before the screen went entirely black (not off).

Would you like a dmesg or a drm debug log?
If there are any other patches available, please tell me.

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