Comment 25 for bug 185440

I have the same problem.
I think this bug was introduced with an update because with the an older CD ( I believe 8.04) it worked fine.
After all the updates (when version became 8.04.1) it started happening. The link above to the Ubuntu forum might work because of this.
dpkg -l *trident* returns:
ii xserver-xorg-video-tri 1:1.2.4-1 X.Org X server -- Trident display driver

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root@neta-toshiba:/etc/X11# ddcprobe
vbe: VESA 2.0 detected.
oem: Trident CYBER 8820
memory: 16384kb
mode: 1280x1024x16m
mode: 1280x1024x64k
mode: 1280x1024x32k
mode: 1024x768x16m
mode: 1280x1024x256
mode: 640x480x16m
mode: 800x600x16m
mode: 1024x768x32k
mode: 1024x768x64k
mode: 800x600x32k
mode: 800x600x64k
mode: 640x480x32k
mode: 640x480x64k
mode: 1024x768x256
mode: 1280x1024x16
mode: 320x200x32k
mode: 320x200x64k
mode: 320x200x16m
mode: 640x400x256
mode: 640x480x256
mode: 800x600x256
mode: 1024x768x16
mode: 132x25 (text)
mode: 132x43 (text)
mode: 132x60 (text)
mode: 80x60 (text)
mode: 800x600x16
edid:
edid: 1 3
id: 5082
eisa: TOS5082
serial: 00000000
manufacture: 0 1990
input: analog signal.
screensize: 29 22
gamma: 1.000000
dpms: RGB, no active off, suspend, standby
timing: 720x400@70 Hz (VGA 640x400, IBM)
timing: 640x480@75 Hz (VESA)
timing: 800x600@72 Hz (VESA)
timing: 1024x768@87 Hz Interlaced (8514A)
ctiming: 1280x1024@60
ctiming: 1600x1200@60
dtiming: 1024x768@74
monitorname: TOSHIBA Inte
monitorname: rnal Panel
monitorname:

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I have tried to leave the xorg.conf blank and also added the driver and various HorizSync and VertRefresh.
In a previous file I also tried to manually set modes with up to 16bit color but still the same.