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Old 07-30-05, 10:21 AM   #1
FredL2
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Default Kernel panic while using OpenGL programs

Hi!
I'm a pretty experienced Linux user, and I haven't used windoze for about 3 years now
Anyway, I installed a GeForce 2 GTS/Pro on AGP (rate 2x). My motherboard is an Aopen (unspecified model) with an ALi chipset. The CPU is an AMD K6-2 @ 350 MHz, which supports 2 MTRR:s and no PAT. (which X continously complains about). I'm using the 7167 driver. I remember everything worked as expected before upgrading from the 6xxx series, except some minor bugs which are gone with the 7xxx series, so I won't go back to the 6xxx series.

Anyway, when I run OpenGL apps and games, such as blender, quake2forge and quake3, the entire system freezes with blinking keyboard leds (kernel panic), I can't switch to the console to find out the reason for the panic, because the system is locked, and I'm stuck in X.
I've also found out that windowed OpenGL apps like glxgears doesn't crash the computer, but the GL output disappears, leaving a black box. I've had this problem in a previous thread (except for the kernel panic)

Is this issue familiar? If so, help would be appreciated
Thanks in advance,
Fredrik Lindroth

Last edited by FredL2; 07-30-05 at 03:54 PM. Reason: spelling correction
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Old 07-30-05, 10:23 AM   #2
FredL2
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Default Re: Kernel panic while using OpenGL programs

Anyway, the X output is:

NVIDIA: failed to set MTRR 0xb8000000, 128M (write-combining)
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Old 07-30-05, 11:41 AM   #3
FredL2
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Default Re: Kernel panic while using OpenGL programs

And the output from /proc/mtrr is:

reg00: base=0x000a0000 (0MB) size= 128KB: write-combining, count=1
reg01: base=0xe0000000 (3584MB) size= 128MB: write-combining, count=1

also, my system has 64MB of RAM, and 64MB of Video RAM
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Old 07-30-05, 04:06 PM   #4
FredL2
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Default Re: Kernel panic while using OpenGL programs

It seems that I have solved the problem. I found out that my AAS (AGP Aperture Size, a BIOS setting) was set alot higher than my RAM size. Decreasing the AAS seems to solve the problem. I hope this will become helpful to other people with this problem
For those who don't know, AAS defines how much system memory that is shared with your graphics card for calculations and textures. Setting this above your RAM size may confuse the computer, but setting it right may increase the performance in some games.
Experiment with this to find the best performance setting.

Last edited by FredL2; 07-30-05 at 04:09 PM. Reason: explained the meaning of AAS
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