I've been having quite an odd issue with my Ubuntu 9.04. For some reason every other (or third) time I boot up my laptop the visible screen becomes square and doesn't extend to the full resolution I expect of 1366x768. So essentially there is about an inch or so of black on either side of the screen. This is a *STOCK* installation and I have not edited the X server. I will be happy to provide more information or logs, just ask what you need!
I have also attached the xlog from a boot where I got a square screen
ryan@TehLaptop:~$ lspci | grep VGA
00:02.0 VGA compatible controller: Intel Corporation Mobile 4 Series Chipset Integrated Graphics Controller (rev 07)
ryan@TehLaptop:~$ cat /etc/X11/xorg.conf
Identifier "Configured Video Device"
Identifier "Configured Monitor"
Identifier "Default Screen"
Monitor "Configured Monitor"
Device "Configured Video Device"