Ubuntu – How to resolve screen flickering on Ubuntu 14.04 LTS and Dell Inspiron 15 7000 Series 7548

compizdellunity

The monitor can go into a flickering mode which is easily triggered by going into "Search your computer and online sources." It is especially bad if other applications are open like Chrome (perhaps opengl related). It can go into a loop that will get so bad that a reboot is necessary. It is not reliable.

I have tried disabling (in compiz-settings-manager) "Unredirect Fullscreen Windows." Also tried increasing the "Launcher reveal Pressure."

So far, since I have only seen this triggered by using the "Search your computer and online sources," I'm wondering if there is a second interface (perhaps text only) that users can use until there is fix..

In the mean time, I have made it stable by decreased the display resolution from 3840 x 2160 to 1920 x 1080.

EDIT:

lspci | grep VGA
00:02.0 VGA compatible controller: Intel Corporation
Broadwell-U Integrated Graphics (rev 09) 08:00.0 VGA compatible
controller: Advanced Micro Devices, Inc. [AMD/ATI] Opal XT [Radeon R7
M265] (rev ff)

Best Answer

Possibly related: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1407913

Try going into CompizConfig Settings Manager and searching for workarounds.

Click on the only result:

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then scroll down to the bottom and select the Force full screen redraws (buffer swap) on repaint check box:

enter image description here

Close CompizConfig and reboot and see if this helps.

This resolved a screen flicker I was having with my NVIDIA GTX 750 Ti, so I'm not totally sure it will work, seeing as you don't give your GPU (if any.)

However, it never hurts (well, normally) to share - hope this helps :)

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