linux-kernel - Re: Regression DRM/i915/KMS: VGA connector unusable after 2.6.31-rc8-git1, DVI connector ok

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Date:	Wed, 09 Sep 2009 23:35:38 +0200
From:	Knut Petersen <Knut_Petersen@...nline.de>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
CC:	airlied@...ux.ie, linux-kernel@...r.kernel.org,
	ykzhao <yakui.zhao@...el.com>,
	Jesse Barnes <jbarnes@...tuousgeek.org>
Subject: Re: Regression DRM/i915/KMS: VGA connector unusable after 2.6.31-rc8-git1,
 DVI connector ok

Linus Torvalds schrieb:
> On Wed, 9 Sep 2009, Knut Petersen wrote:
>   
>> As the old X does not work with the new kernel, I cannot decide if the 
>> kernel or X is to blame.
>>     
>
> Hmm. Doesn't old X work if you disable KMS? Either with "i915.modeset=0" 
> or by just compiling it out?
>
>   
It does work somehow, but very slow and jerky as long as DRI is
enabled in the kernel.

It´s not a a problem related to KMS. Allocation of tiled buffers fails with
that old X, although it worked with 2.6.22.6, that results in a massive
performance drop (more than 70 percent).

Jerky drawing can only be avoided if DRI is disabled in the kernel.


cu,
 Knut
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