Help! Screen resolution problem with Via P4M890 S3 Unichrome Pro

[gurogarry]

Hello. Linux/Ubuntu newbie here. I am running Ubuntu 8.10 with a Via Technologies P4M890 S3 Unichrome Pro (Rev 01) graphics chipset. When I first installed Ubuntu, it started correctly with 1024x768 screen resolution, with options for higher resolutions. Everything was fine for about a month.

Then one day while shutting down, the colors of the logo weren't correct. When I rebooted, the computer came up in 800x600 resolution and only give options for 800x600 and 640x480.

I've tried booting with the LiveCD and a complete reinstall. Both gave the same results. I've spent hours searching through this forum for an answer, and trying out the solutions I sort of understand, but nothing has worked so far.

Can someone please help me?

Thx,

G.

[overdrank]

HI and have you tried booting into recovery mode and using the xfix option. Recovery mode is usually the second choice from the grub. Then you can choose the xfix option. Then you should be given the choice of booting normally after the configuration of you x is complete.

[gurogarry]

Tried it. No go. Same problem. Any other suggestions?

[overdrank]

Tried it. No go. Same problem. Any other suggestions?

The amount of memory shared with the graphics in bios. If you can adjust this it may help.

[gurogarry]

OK. I increased the shared memory from 64M to 128MB, but still no change. Also, I have a dual boot setup with XP, and the XP works just fine in 1280x768 mode.

[gurogarry]

I'm still not getting anywhere with this and am still stuck in 800x600 resolution. Today I tried following the directions at https://help.ubuntu.com/community/OpenChrome.

I got as far as "...change Section "Device" Driver "vesa" to Driver "openchrome".

This is what I got:

Section "Device"
Identifier "Configured Video Device"
EndSection

Section "Monitor"
Identifier "Configured Monitor"
EndSection

Section "Screen"
Identifier "Default Screen"
Monitor "Configured Monitor"
Device "Configured Video Device"
EndSection

It's not showing any drivers. I also tried running sudo dpkg-reconfigure -phigh xserver-xorg as mentioned, but all I got was:

xserver-xorg postinst warning: overwriting possibly-customised configuration file; backup in /etc/X11/xorg.conf.20090222175002

...and was returned to the command prompt.

Can someone please help me?

Thx,

Garry