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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
    Commented Oct 22, 2015 at 23:27
  • I see garbled text too sometimes. Using intel gpu.
    – o9000
    Commented Oct 22, 2015 at 23:50
  • Open source drivers. Commented Oct 23, 2015 at 6:11

2 Answers 2

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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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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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