Messages in this thread | | | Date | Mon, 20 Oct 2003 12:01:23 +0200 | Subject | PROBLEM: Hangup with Radeon9200 accel. Does not happen when not using agpgart or disabling CPU internal cache. | From | Juanjo García Carré <> |
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-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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