I have upgraded to Wily and I am getting a weird screen glitch. I have uploaded the screen shot. Can somebody help me fix this? I have booted to Windows Vista and there are no glitches so I am ruling out hardware issue. Other windows managers too show the same glitch i.e. fluxbox, xfce etc. The graphics controller is an Intel 4 series with driver i915.
Older Intel graphics adapters may need UXA acceleration instead of the default. The work-around is to change the Xorg acceleration method to UXA.
Edit (or create) as root or sudo a file named /etc/X11/xorg.conf as follows (there should be a tab before each line except the first and the last):
Section "Device" Identifier "Intel Graphics" Driver "intel" Option "AccelMethod" "uxa" EndSection
Restart (reboot, restart your display manager, whatever). Problem solved.
This is a kernel bug. Downgrading to the The 15.04 kernel fixes the issue.