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Date:	Sun, 1 Mar 2009 12:39:48 +0100
From:	Ingo Molnar <>
To:	Sitsofe Wheeler <>
Cc:	Venkatesh Pallipadi <>,,
	LKML <>,
	Suresh Siddha <>,
	Jesse Barnes <>
Subject: Re: [TIP,regression,i915] /dev/dri/card0 is no longer present

* Sitsofe Wheeler <> wrote:

> Hi,
> With the latest -tip /dev/dri/card0 is MIA on my EeePC 900. A bisection
> has tracked the probem down to the following commit:
> commit 17581ad812a9abb0182260374ef2e52d4a808a64
> Author: Venkatesh Pallipadi <>
> Date:   Tue Feb 24 17:35:14 2009 -0800
>     gpu/drm, x86, PAT: PAT support for io_mapping_*
>     Make io_mapping_create_wc and io_mapping_free go through PAT to make sure
>     that there are no memory type aliases.
>     Signed-off-by: Venkatesh Pallipadi <>
>     Signed-off-by: Suresh Siddha <>
>     Cc: Dave Airlie <>
>     Cc: Jesse Barnes <>
>     Cc: Eric Anholt <>
>     Cc: Keith Packard <>
>     Signed-off-by: Ingo Molnar <>
> Reverting this made /dev/dri/card0 reappear. Here is the 
> bisection log:

Thanks, i've reverted the commit for now. Could you please send 
a 'dmesg' from the bootup with the failed driver? By all 
likelyhood an ioremap failure causes a driver failure.

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