[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 #32 from Matt Turner <mattst88 at gmail.com> ---
(In reply to comment #30)
> 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

Good call! ASRock's website doesn't appear to have direct links to older BIOS
versions, but if you guess the links, and it turns up these versions:

http://download.asrock.com/bios/1155/H67M(1.60)WIN.zip
http://download.asrock.com/bios/1155/H67M(1.70)WIN.zip
http://download.asrock.com/bios/1155/H67M(1.80)WIN.zip

So if someone has an older revision B2 chipset they can try these versions. I
RMA'd my board (given that it /was/ recalled because of the SATA issues) and
got a new B3 chipset that supports Ivy Bridge and has BIOS v2.10.

No more rc6 failures with this board.

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