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SubjectPROBLEM: Hangup with Radeon9200 accel. Does not happen when not using agpgart or disabling CPU internal cache.
From

-Foreword: I am not complaining; just hoping to help in developing
a better kernel.

-Symptom: When accelerating graphics, the machine freezes completely
(no response to emergency sys req keys or net access).
As a consequence, NOTHING GETS LOGGED (sorry).

-How to reproduce:
1) Use the following hardware:
Radeon 9200 AGP graphics card.
CPU PentiumII Deschutes (Tried the same card on an
Athlon machine -all the rest being equal- and the problem did not happen).
baseplate Tyan (This means Intel 440BX chipset)

2) Enable in BIOS the CPU internal cache to
"Write Back" mode.
(Either "Write Thru" or "Disabled" will eliminate the problem,
at the expense of an extremely low performance).

3) Use ANY Linux-2.6.0-test kernel, or ANY
Linux-2.4 kernel, (in which case you will need
an updated version for the radeon module).

4) Use XFree86 4.3.0 or over (for radeon acceleration support) with ANY
dri version (older or newest).
I have tried the latest DRI CVS without success.

5) In the XF86Config-4 file, specify the chipset of a Radeon 9100 or
another radeon for which acceleration is already supported (I know this is not
the factor to blame, since -as I said before- it works on an Athlon machine).

6) In the XF86Config-4 file, make sure the option ForcePCIMode is off
(when it is enabled, everything works fine and you need no agpgart
module, but performance is halved).
_ALL_ the other options are indifferent in order to reproduce the
problem, (even the option to use the XFree GPL radeon driver or the propietary
FireGL drivers from Ati).

7) Make sure the agpgart module (and the intel_agp module for 2.6
kernels) are loaded before launching XFree.

8) Launch X. Everything seems to work; glxinfo says Yes as to direct
rendering. Now launch an OpenGL application, like glxgears:
It runs for some instants, then becomes blocked, as does the rest of the
system.

Observation: When a big Graphics Aperture Size (256MB) is specified in
BIOS (thus adopted by the agpgart module) and a small one (4MB) in the
XF86Config-4 file, then the time until crash is considerably increased.
(Does this mean anything to you?)

Please reply with Cc to juanjo@eurogaran.com because I am not
suscribed to any kernel mailing list.

Thank you.

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