SL410 1280х800 resolution instead of native 1366x768

[pit___]

Hi there,
ocassionally, my sl410 started to display in 1280х800 instead of 1366x768, so I see an image shifted to the left and down and black ribbons at the top and on the right. And this happens even in bios. In ubuntu, display setting do not let me change to 1366x768 as there is no such option in a list, only 1280х800, 800х600 and less.
Did anybody face such a problem, don't you think if bios firmware upgrade can help?

Thanks, Alexander

[RealBlackStuff]

Either a wrong graphics driver, or a wrong screen installed.