I have systems that start applications that switch to fullscreen mode on their own. Most of the time this works as expected, sometime this results in a small window in top left corner. This happens with different applications (reproduced with a VMware client and python with webview), different window managers (reproduced with openbox and fluxbox) and different hardware/driver. I think this is a regression from xorg-server 1.18.x to 1.19.0, had the first reports in December 2016. With debugging output enabled in openbox I see a number of configuration events. In case of issue there are extra configuration events that switch the applications view to a small area in top left corner.
Created attachment 133769 [details] debug output when issue occured
Created attachment 133770 [details] debug output with expected result
Created attachment 133772 [details] xev log when issue occured
Created attachment 133773 [details] xev log with expected result
(In reply to Christian Hesse from comment #0) > I think this is a regression from xorg-server 1.18.x to 1.19.0, [...] Can you or somebody bisect between those? Does it still happen with current xserver Git master or at least the 1.19.3 release?
(In reply to Michel Dänzer from comment #5) > (In reply to Christian Hesse from comment #0) > > I think this is a regression from xorg-server 1.18.x to 1.19.0, [...] > > Can you or somebody bisect between those? Does it still happen with current > xserver Git master or at least the 1.19.3 release? It does happen with 1.19.3, yes. I did not yet try git master as ABI changed and I have to rebuild a number of drivers. Same for bisecting... Next problem is that it happens very seldom and I did not find a way to reproduce reliably.
This is still an issue with 1.19.4.
This still happens with xorg-server 1.20.0.
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