[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

--- Comment #30 from Jerome <an.inbox at free.fr> ---
It looks like it's not a graphics issue but a generic x86-64 PM bug, see kernel
bug 104771:
   https://bugzilla.kernel.org/show_bug.cgi?id=104771

The discussion mentions a patch for this issue:
   https://patchwork.kernel.org/patch/9172981/

It applies cleanly to the Intel DRM kernel (I used 4.7.0-rc4, commit
5c244f4b128c6274755007e080d46e0a61b71534). From the comments it needs a recent
kernel: someone tried a 4.6.2 ok, but the patch didn't apply to a 4.5.

It's too early to say this patch fixes the issue completely for sure, more
testing is needed, but it certainly helps a lot. No crash so far with 20
cycles. For those having the issue I recommend trying it.
>From comments, the patch should be in the final 4.7.0.

Also from comments, the hang is more likely when more memory is allocated at
suspend time. In the kernel bugzilla entry there's a small app to allocate as
many blocks of 1 GB as possible, you can try it.

I will report back later after more cycles.

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