Video problems with Gentoo on Toshiba portege 7200 laptop

[benjo417]

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
video=tridentfb:1024x768,bpp=16,redraw,fp
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.

/Benny

[jaboua]

Not quite sure why, but you did include the vesafb-tng option in the kernel instead of vesafb? If not, you apply the option like this instead:

kernel /vmlinuz bla bla bla vga=773

Also, it might be worth a shot to change the default framebuffer mode in the kernel if you do have vesafb-tng

Tell us if you used genkernel as well!

EDIT: Settings used by livecd is at here from the livecd:

zcat /proc/config.gz|less

[variant]

my laptops BIOS has a "stretch display" option, if its disabled then i get the same problem