Static switcher background flicker

Bug #1191455 reported by kolya on 2013-06-16
This bug affects 4 people
Affects Status Importance Assigned to Milestone

Bug Description

Way to reproduce:

1) enable static switcher.

2) Press alt+tab

3) Release tab and hold alt

After some time background starts to flicker. It looks like switcher's window transparency changes momentarily and then goes back. Also shadow becomes more pronounced in the same moment.
It looks like this happens only when system is relatively idle. It doesn't seem to be happening if one application does active screen output, like terminal with 'tail -f' for some actively updated file.

Expected behaviour - no sudden background flickering.

Switcher (not 'static') also has this problem but it is only reproducible if transparency/brightness/saturation are set to 100 and zooming is disabled.

This problem didn't exist in compiz that came with Ubuntu Natty.

kolya (mar-kolya) wrote :

I've tried to do some 'gdb-ing' but after several hours I got nothing useful. It is possible though that I was just looking in the wrong place.

I would be happy to help diagnosing this issue but I would need a little help on where I should start looking.


MC Return (mc-return) on 2013-06-17
Changed in compiz:
milestone: none →
importance: Undecided → Medium
MC Return (mc-return) on 2013-07-24
Changed in compiz:
milestone: →
kolya (mar-kolya) wrote :

Some additional information about this bug: it looks like it is being caused by screen updates that happening while static switcher is being shown.

I've tried new-clean account with all clean profile and Iwas able to reproduce bug on two different machines: the only thing user needs to do it to put 'System Monitor' applet on to the panel (I'm using Mate DE). Once applet if there is starts rendering cpu usage and stuff and this cause flicker to be very prominent.

Hope this helps finding the root cause.


Changed in compiz:
status: New → Confirmed
Eleni Maria Stea (hikiko) wrote :

Thank you for taking the time to report that bug. As part of a general clean-up we decided to close it since the static switcher is not part of the unity desktop and has conflicts with the unityshell plugin. Therefore I changed the status to Won't Fix.

Changed in compiz:
status: Confirmed → Won't Fix
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