linux-kernel - Re: [radeon agp] add blacklist for thinkpad T40p

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Message-ID: <CADnq5_PHYZdVP1DZj-asumTbBwmCDmuRBZmd8cyVUGZD=+pFAg@mail.gmail.com>
Date:	Wed, 2 Dec 2015 11:33:01 -0500
From:	Alex Deucher <alexdeucher@...il.com>
To:	Emil Velikov <emil.l.velikov@...il.com>
Cc:	Pavel Machek <pavel@....cz>,
	Trivial patch monkey <trivial@...nel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Maling list - DRI developers 
	<dri-devel@...ts.freedesktop.org>,
	"Deucher, Alexander" <alexander.deucher@....com>,
	Christian Koenig <christian.koenig@....com>
Subject: Re: [radeon agp] add blacklist for thinkpad T40p

On Wed, Dec 2, 2015 at 6:15 AM, Emil Velikov <emil.l.velikov@...il.com> wrote:
> On 30 November 2015 at 19:47, Alex Deucher <alexdeucher@...il.com> wrote:
>> On Sat, Nov 28, 2015 at 4:01 PM, Pavel Machek <pavel@....cz> wrote:
>>>
>>> Thinkpad T40p needs agpmode 1.
>>>
>>> Signed-off-by: Pavel Machek <pavel@....cz>
>>
>> Seems odd that this wouldn't have been found earlier given how popular
>> thinkpads are.  Applied.  Thanks,
>>
> Wondering if it wouldn't be better to apply these restrictions within
> the AGP driver. I have a vague recollection that (at least?) some of
> these are chipset limitations/bugs ?

I think it's probably better in the GPU drivers.  AGP was always
problematic.  There are a number of quirks that were necessary for
some users but not others on the same hardware.  Additionally, the
combination of vendors or even driver versions/behaviors were
problematic.  E.g., with UMS, the drivers didn't use much gart since
there was just a single static allocation.  Once we switched to KMS,
lots of new bugs surfaced.  Chipset A plus GPU vendor B worked fined,
but chipset A with GPU vendor C was problematic.

Alex
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