First a description of my problem: Updated my drivers to 8.19.10 as described in the how to's fglrxinfo..and glxinfo all said ok...direct rendering ok etc.:)
ran xmoto...and my screen locked up, froze everything...only way out is a hard reboot...couldn't use keyboard or mouse to get out of the black screen.:(
ran glxgears same problem hard lock black screen. fgl_glxgears also but only after a few minutes...:(
search the fora and found a solution: disabled agp 8x and fastwrites...in xorg.conf set it to agp 4x and fastwrite off.
it worked::)
my xorg.conf lines I used: Option "VideoOverlay" "on" Option "OpenGLOverlay" "off"
=== Misc Options ===
Option "AGPMask" "0x00000210" Option "AGPv3Mask" "0x00000212" Option "UseFastTLS" "0" Option "BlockSignalsOnLock" "on" Option "UseInternalAGPGART" "no" Option "ForceGenericCPU" "no" Option "KernelModuleParm" "agplock=0" # AGP locked user pages: disabled BusID "PCI:1:0:0" # vendor=1002, device=4152
agpmask explained: AGPMask: 0x00000001 = AGP 1x disable (force 2x and/or 4x) 0x00000002 = AGP 2x disable (force 1x and/or 4x) 0x00000004 = AGP 4x disable (force 1x and/or 2x) 0x00000010 = fast writes disable 0x00000200 = Sidebanding disabled
AGPv3Mask: 0x00000001 = disable AGP 4x (force 8x) 0x00000002 = disable AGP 8x (force 4x)
Hope this helps somebody else too :)