[ltp] Thinkpad T21 Accelerated video problem

[Alex Deucher]

Sorry for the top post.  try:
Option "DmaMode" "None"


---------- Forwarded message ----------
From: harry wert <hwert@earthlink.net>
Date: Mar 8, 2006 7:48 AM
Subject: Re: [ltp] Thinkpad T21 Accelerated video problem
To: linux-thinkpad@linux-thinkpad.org


 On Wed, 2006-03-08 at 00:35 -0500, Alex Deucher wrote:

 On 3/7/06, harry wert <hwert@earthlink.net> wrote:
> Hello, I have a Thinkpad T21 running Ubuntu Dapper Drake. Everything is
> working extremely well except I cannot find a repeatable combination of
> video driver settings which will survive a reboot or cold start. When
> working, performance is an acceptable increase from 70fps to 355fps. The
> internal video card is a Savage /IX-MV, with a chip ID of 8c12 which
> contains 8192kb of video memory. The accelerated video will not run in th=
e
> 24 depth mode because it needs more than 8092kb of memory. I am able to
> coax it tho run in the 16 depth mode with a lot of experimentation but al=
l
> is lost on reboot or a cold start. When it fails to start I experience a
> hard freeze which will require a power off shutdown to free up. On the ne=
xt
> boot the screen appears to be attempting to find a workable video mode bu=
t
> will ultimately lock into a dark screen and a hard freeze. It is then
> necessary to boot up in the recovery mode and change the video depth from=
 16
> back to 24 to restore normal (no video acceleration) video operation. I
> have been searching with Google and reading whatever I can locate on this
> subject but seem to have struck out!
>
> The only video tool I can find to use is xvidtune which is not easy to us=
e.
> Two questions:
>
> 1. Are there better tools out there for video tuning and adjustment such =
as
> SAX on SuSE?
>
> 2. Does anyone have a working xorg with acceleration on a T21 and Ubuntu?
>
> This is not a crisis - just a curiosity as I don't usually run many
> programs which require video acceleration.
>
> Thanks in advance for any comments and/or guidance in this matter.
>

Try setting:
Option "BusType" "PCI"
AGP hasn't worked reliably on thinkpads with savages in a while.

Alex

> Harry Wert
> Physicist
>
>

 Thanks Alex.  I incorporated your suggestion and major progress has
been achieved.  Now xorg reliably boots into the 16 depth mode and no
errors are reported in the xorg.0.0 log.  Unfortunately when I attempt
to use 3D using glxgears the program attempt to start but cannot
apparently find the correct mode for several seconds, then stops and
freezes the system into a hard lock.  Reboot restores the screen for
normal 16 depth again.  Another program I use for testing "TORCS" goes
to a full-scale dark screen but does not freeze the system.
Consequently I can go to another console and kill the process to
restore normal operation.  I'll continue to investigate as I have time
and report back if I find a solution.

 Thanks for your help.

 Harry Wert
 Physicist

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