[Bug 50619] [SNB rc6] drop MMIO writes leading to GPU hang

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=50619

--- Comment #30 from Stefan <sponk-pokorny at gmx.de> ---
Hello all, I used to see very similar behaviour on my Sandy Bridge box.
Interestingly I'm also using an Asrock Board (H67M-GE). That indicates that it
might be a hardware issue. I flashed the latest BIOS version provided bei
Asrock (V 2.10, used to have 1.40 or 1.50 before, don't remember exactly) and
the issue went away for me, hasn't ever re-appeared since.

If I remember correctly, the BIOS changelog mentioned something about fixing
the voltage settings of the GPU for the change to version 1.60. Asrock's
documentation is rather poor unfortunately, but searching the web for "h67m-ge
igpu voltage" yields several hits with descriptions of the BIOS update:
"Modify default setting for IGPU voltage."

As the bug seems to appear only with RC6 enabled there might be a connection
here.
If there's no new BIOS available for other boards, manually changing IGPU in
the BIOS/UEFI might also work around the issue maybe.

Maybe that helps someone.

Regards,
Stefan

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