[Bug 94241] Blanks screen on hibernation but does not switch off the machine

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=94241

Ilya Tumaykin <itumaykin at gmail.com> changed:

           What    |Removed                     |Added
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                 CC|                            |itumaykin at gmail.com

--- Comment #8 from Ilya Tumaykin <itumaykin at gmail.com> ---
Created attachment 172481
  --> https://bugzilla.kernel.org/attachment.cgi?id=172481&action=edit
acer-gen5.patch

Hello.

I also experience this issue since 3.19.0 on my machine, which is the Acer
Aspire 1830T laptop with Ironlake i3-330UM. The symptoms are exactly as
described in the comment #0 or at
http://lists.freedesktop.org/archives/intel-gfx/2015-February/060633.html.

I've adjusted the solution from http://patchwork.freedesktop.org/patch/43731/
to cover my hardware (Gen5 + PCI_VENDOR_ID_AI) and I can confirm that the
hibernation/thaw cycle works properly with it. I do not have any problems
similar to those described in the comment #4, but an error appears in dmesg
during the hibernation:

kern  :info  : [ 1108.276140] PM: Syncing filesystems ...
kern  :err   : [ 1108.292664] [drm:ironlake_irq_handler [i915]] *ERROR* PCH
transcoder A FIFO underrun
kern  :warn  : [ 1108.391303] done.
kern  :warn  : [ 1108.391315] Freezing user space processes ... (elapsed 0.407
seconds) done.

The rest of the hibernation process completes without any errors or warnings.
I've attached the patch (against linux-stable:v3.19.3) I've used though it is
very simple.

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