Am Freitag, den 17.02.2006, 21:02 +0100 schrieb Markus Dahms:
Hi there,
I have some stability problems with radeon cards in my system. Doing
something involving 3D graphics (e.g. Blender) after a while
(often within minutes) the screen locks up (mouse is still movable)
and the Xorg process goes up to 99% CPU. To use the screen again I
have to reboot.
From the GDB backtrace of the X server I suspect it's a kernel
module problem:
#0 0xa7f11cc4 in ioctl () from /lib/tls/libc.so.6
#1 0x080a2890 in xf86ioctl ()
#2 0xa7a92672 in drmCommandNone () from
/usr/X11R6/lib/modules/linux/libdrm.so
#3 0xa7a5181a in RADEONWaitForIdleCP () from
/usr/X11R6/lib/modules/drivers/radeon_drv.so
#4 0xa786758d in XAAInit () from /usr/X11R6/lib/modules/libxaa.so
#5 0xa78b19d7 in xf86InitCursor () from /usr/X11R6/lib/modules/libramdac.so
#6 0x08089e03 in xf86Wakeup ()
#7 0x080ca3f3 in WakeupHandler ()
#8 0x080e8731 in WaitForSomething ()
#9 0x080c9970 in Dispatch ()
#10 0x080d6765 in main ()
(at least the upper 4 calls are always the same, the rest differs)
The backtrace only tells you that the engine stopped processing
commands. But it doesn't tell you why. Finding the exact trigger can be
very hard.
Does somebody have a hint? I don't want to believe it's a broken
mainboard or something...
Software:
* Debian Etch (testing)
* Xorg 6.9.0 (same with 6.8.0)
* Linux Kernel 2.6.16-rc2+e (GIT, same with older kernels)
* radeon.ko from kernel
Hardware:
* 2 x P3 1000MHz on Asus CUV266-D, 1 GB RAM
* Radeon 9250, same problem with Radeon 7500
Everything is done with AGP 1x mode, as higher rates increase the
chance to crash this system (even in 2D mode).
If you have AGPFastWrites enabled, do disable them. Did you set any
other funny options in the configuration file? It may also be related to
AGP writeback of engine status. It doesn't work reliably with some AGP
bridges and leads to the symptoms described above. In that case the
engine is finished processing commands and ready for new ones, but the
driver never knows about it.
It's pretty simple to disable this feature in the radeon.ko source.
Search for Writeback in radeon_cp.c. There is a test whether writeback
works. At the end of the test just set dev_priv-writeback_works = 0;
unconditionally.
I don't think it's a heat problem as there are enough fans and the
cooler on the graphics card stays cold.
Markus
Hope this helps,
Felix
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