Video problems with Gentoo on Toshiba portege 7200 laptop
I have problems with the video settings in Gentoo on my Toshiba portege 7200 laptop. The kernel is 2.6.12-gentoo-r6 and a I use a Trident Cyberblade 9540 vido card. When I boot Gentoo I can only use a part of the screen, a "rectangle" in the middle. The same problem occurs under Win XP with res 800x600 but it works with 1024x768 there. When I boot Gentoo from the universal installation cd I can use the full screen.
I have added in grub.conf
When I check dmesg after booting the 2.6.12-gentoo-r6 kernel it says:
tridentfb: 1024x768 flat panel found
Console switching to colour frame buffer device 640x480-8bpp
So, it looks like something is changing my resolution, or?
How do I solve this? One way would be to see what settings the installation cd uses, but I don't know how to find that.