Red Hat Bugzilla – Bug 1010577
Random application windows invisible after KDE updates
Last modified: 2015-02-17 12:17:10 EST
Description of problem:
The main thunderbird window is completely invisible. Running from a terminal shows nothing odd. TB appears in process list and KDE task bar. If I r-click entry in task bar, hit More Actions, and then Move as I push my mouse around KDE shows the dimensions and positions in the corners and center of the "window" as usually would, however they are merely floating over my desktop background image ... there is nothing of TB actually showing. If I hover over the task bar, I can see a preview of the TB window, but that's about as close as I can get.
Version-Release number of selected component (if applicable):
I will try an older kernel or two and report back my experience with those.
I've now also tried kernel-3.10.11-200.fc19.x86_64 and kernel-3.10.6-200.fc19.x86_64 and am still seeing the problem with those. Since this problem showed up just yesterday and this same system had been very stable otherwise, I'm inclined to think that the problem must somehow be related to the KDE updates that got applied yesterday taking the box from 4.10 to 4.11.
Another observation that is weird is that even though TB appears in the task bar, when I Alt-Tab to cycle through the windows, TB is not shown as an option.
I've also tried changing the Desktop Effects advance setting for the compositing type through various OpenGL versions and XRender and also tried disabling Desktop Effects completely. Nothing seems to help.
I'm fresh out of ideas. Any suggestions?
Okay, I found something. Yesterday after upgrading to KDE 4.11 I noticed that my desktop effects had been turned off, either from the upgrade or some mishap earlier. I have my home shared over NFS and use the same KDE setup on three very different computer systems hardware wise. When perusing the KDE desktop effects settings, several things seemed amiss so I tried the Defaults button thinking it was probably good to align my setup with mainstream since my ~/.kde dates back eons. All seemed well and improved ... until I noticed the TB problem.
What I just found is that toggling the Qt Graphics System setting from Native to Raster seemed to rectify the invisible TB problem. I can see it again.
Thus, I'm happy now, but I'll leave this BZ open for now in case this warrants further investigation. I'll be happy to do any other experimenting, testing or fact gathering that's requested.
I'm also seeing this with a custom (shareable, if that would be helpful) wxPython app I've written, so I don't believe this is has anything to do with Thunderbird specifically. Thunderbird is very sensitive to the setting for Qt Graphics System, but I cannot find any setting that makes the wxPython app visible.
Well, hold on! I have something here that seems to fix any of these, permanently where the Desktop Effects settings no longer matter. For both Thunderbird and my wxPython app, I have custom window rules set up. Thinking that these might be interfering somehow I changed the rule properties (title match or window class match) so that they would never match (by adding a few garbage characters). After applying (and IIRC, restarting the affected apps) the windows became visible again, working normally. Furthermore, reverting my window rules back to as they were gave me the pre-KDE-upgrade behavior: window rules applied and did what they should AND the windows were visible.
So, it looks like KDE 4.11 (and/or 4.11.1) somehow broke custom window rules setups, but doing a little fiddling with those rules somehow fixes them.
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