I have this one too. Asus K8V SE M/B; Asus graphics card Radeon XPRESS
9250 128M. Kubuntu 8.10. Exact same crashing and cut-off Xorg log
behaviour.

In Bug #141551 I read about AGP bus modes causing such problems with
other Radeons, so I experimented with that.

System BIOS only lets me choose AGP8X or 4X. I set it to 4X, and in
xorg.conf added "AGPMode" "2". This still fails, but examination of the
truncated Xorg.0.log shows why: when it tries to set 2X, it reports
ILLEGAL MODE - forcing AGP 4X

next I tried:
"BusType" "PCI", and sure enough it works. the log reports:
(--) RADEON(0): Chipset: "ATI Radeon 9250 5960 (AGP)" (ChipID = 0x5960)
(--) RADEON(0): Linear framebuffer at 0x00000000e8000000
(II) RADEON(0): AGP card detected
(**) RADEON(0): Forced into PCI mode

Sadly, like other users in  Bug #141551, this slows everything down very
badly.

The VESA driver works perfectly, but of course I am looking for the
extra features of radeon driver!

-- 
No signal to monitor in 8.04 with Ati Radeon 9250 and open source driver
https://bugs.launchpad.net/bugs/293698
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