Re: [git pull] agp patches for 2.6.28-rc1.

From: Andres Freund
Date: Sun Oct 19 2008 - 20:34:42 EST


On Monday 20 October 2008 02:19:37 you wrote:
> The GM45/G45 support in both kernel and user space was horribly broken,
> causing the kernel to either overwrite stolen entries with freshly
> allocated pages, and potentially corrupt the system, or leave some GTT
> entries uninitialized and cause the hardware to lock up.
I had some crashes with 3d, but none in 2d as far as I know.

> You appear to have a happy situation where this bug isn't obviously
> breaking things. We couldn't find any machines where even simple 2D
> graphics was stable for very long.
Interesting. I had the system running for some days without problems related
to graphics.

> We applied a patch to both kernel and 2D driver (as both end up
> computing the size of the GTT stolen area for historical reasons) to fix
> this mistake. Updating your 2D driver to 2.4.98 should get you the other
> half of the fix.
Ok, will try, and also report this to ubuntu and maybe other distributions...

> Yeah, I'm getting information about how 'hybrid' graphics hardware
> works.
If you need some information/testing/whatever...

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