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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.

Screen Glitch

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Proprietary or open source drivers? – KGIII Oct 22 '15 at 23:27
    
I see garbled text too sometimes. Using intel gpu. – o9000 Oct 22 '15 at 23:50
    
Open source drivers. – mindentropy Oct 23 '15 at 6:11
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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.

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up vote 0 down vote

This is a kernel bug. Downgrading to the The 15.04 kernel fixes the issue.

see: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1509556

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