reassign 637511 src:linux-2.6 3.0.0-1
forwarded 637511 https://bugs.freedesktop.org/show_bug.cgi?id=40181
quit

P. J. McDermott wrote:

> Investigation shows that the machine's Intel i915 GPU reproducibly hangs
> on the first display manager login attempt after boot, but so far never
> on subsequent attempts. Oddly we never saw this on Debian Squeeze live
> CDs, so I wonder if this is a new bug in Linux.

>From Chris Wilson, upstream:

| Short story, don't even think of using the GPU on the 845G. There's a
| fundamental silicon bug that the workaround for has been lost in the mists of
| time and continues to cause misery for everyone unfortunate to encounter the
| 845G.

"Lost in the mists of time" means "Could be discovered by finding out
how it regressed and staring at the old code". Because I don't
remember, I'll just ask: does the 845G use KMS in squeeze?

Thanks,
Jonathan



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Sorry for my late response; this thread was lost in the mists of my mail
client.

On 09/14/2011 02:19 PM, Jonathan Nieder wrote:
> "Lost in the mists of time" means "Could be discovered by finding out
> how it regressed and staring at the old code". Because I don't
> remember, I'll just ask: does the 845G use KMS in squeeze?
>
> Thanks,
> Jonathan

I would assume it does, but I don't currently have access to the machine
to tell for sure. I saved a few things from the system: $DEBUGFS/dri/,
/var/log/syslog, /var/log/kern.log, and /var/log/Xorg.0.log.
Unfortunately I don't see any clues in these; if I've missed something
in these files that may help, let me know. I also tried searching
through drivers/gpu/drm/i915/ of the Linux source, but my untrained eye
found no hints.

Next time I have access to the machine, I can check for KMS. And if I
have time and it might help, I can build a new Linux image with
additional debugging options (let me know which, if any) enabled in the
configuration.

Thanks,
P. J.



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