[Bug 91585] [BDW] System hard lock-up on resume from suspend

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=91585

Jerome <an.inbox at free.fr> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
      i915 platform|                            |BDW

--- Comment #6 from Jerome <an.inbox at free.fr> ---
With Intel kernel 4.2.0rc5, with old driver 2.21.15 (so LLVMpipe for 3D): I had
a lock-up at the 3rd resume (long hibernations, > 1h). I then tried quick
suspend/resume cycles and got 2 lock-ups in 6 cycles.

I then update the X Intel driver to 2.99.917 (still with Intel kernel
4.2.0rc5). Because glxgears may be too light to make a difference, I installed
and ran Tux racer. Then did suspend/resume cycles, mostly in short succession
but with some pauses of a few minutes at times: it locked-up at the 22nd resume
only.

So, to resume:
 - the issue occurs both with LLVMpipe (X driver 2.21.15) and real hardware
acceleration (X driver 2.99.917). Also both with kernels 4.1.3 (Debian testing)
and Intel 4.2.0rc5, all 4 combinations tested;

 - having running 3D clients when suspending does not seem to increase the
likelihood of a lock-up;

 - the lock-up seems to happen early, before the mode switch to a graphical
setting (still in console mode when it locks up). By this I mean that anytime I
saw the glitch/flicker that happens when switching to graphical mode, then the
resume went fine (no lock-up);

 - the lock-up frequency is highly variable, it's hard to make reliable
conclusion based on it. So ignore my previous comment on getting lock-up after
a long suspend duration, it's likely just chance and not relevant.

Please let me know how how you want to proceed here. Thanks

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