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

[bugzilla-daemon at freedesktop.org]

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

--- Comment #32 from Jiri Kosina <jikos at jikos.cz> ---
(In reply to comment #31)
> Now that the proper fallback handling is on track, have we attempted to
> bisect where the underlying root-cause (ring init failure on resume) was
> made much worse? I guess on some older kernels this worked better.

I am afraid this is close to impossible.

The frequency of the problem happening fluctuates *a lot* between different
kernel.

- I am pretty sure that I've *never ever* seen it happening on 3.7 kernel, and
it has been excercised a lot on the system in question

- Around 3.13, this seems to happen in a rather "time to time" manner (say once
in 40 resumes, but with rather large standard deviation)

- with current Linus' tree and with the drm tree as well, this happens
super-reliably on almost every resume from hibernation

I don't have enough data from the kernels in between to be able claim the ratio
reliably.

I am afraid this pretty much implies that bisecting this reliably would consume
incredible amount of time and might still produce unreliable result.

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