Created attachment 1148541 [details] system journal during system hang Description of problem: I have two 1920x1080 displays. When I run liveusb-creator and try to move it to a different display, its window immediately enlarges and the whole system gets stuck, the liveusb-creator window flickers. After a minute or two, the system runs out of memory and kills liveusb-creator, often taking down the whole session with it. Version-Release number of selected component (if applicable): liveusb-creator-3.92.1-1.fc23.noarch (also fc24 version) How reproducible: Tested on 4 different computers, reproduced 4 out of 4 times. Steps to Reproduce: 0. save your data 1. run liveusb-creator in a multihead setup 2. move it to a different display 3. see system get stuck
What environment are you running in? X or Wayland? This seems to be caused by the window scaling code. On my Xorg GNOME 3.18.4 it's okay though.
I think this might be related to some broken high DPI detection in QT. Because when I don't try to move the window from one screen to another, but run it directly from that particular screen, on one of the screens (external display) I have "normal"-sized UI, but on the other screen (internal laptop display) I have "doubled"-sized UI. Both screens are 1920x1080. All of this is reported on X11. xrandr output: $ xrandr Screen 0: minimum 8 x 8, current 3840 x 1080, maximum 32767 x 32767 eDP1 connected 1920x1080+0+0 (normal left inverted right x axis y axis) 309mm x 173mm 1920x1080 60.05*+ 1400x1050 59.98 1600x900 60.00 1280x1024 60.02 1280x960 60.00 1368x768 60.00 1280x720 60.00 1024x768 60.00 1024x576 60.00 960x540 60.00 800x600 60.32 56.25 864x486 60.00 640x480 59.94 720x405 60.00 640x360 60.00 DP1 disconnected (normal left inverted right x axis y axis) DP2 disconnected (normal left inverted right x axis y axis) DP2-1 connected primary 1920x1080+1920+0 (normal left inverted right x axis y axis) 510mm x 287mm 1920x1080 60.00*+ 1680x1050 59.95 1400x1050 59.98 1600x900 60.00 1280x1024 75.02 60.02 1440x900 59.89 1280x960 60.00 1280x800 59.81 1152x864 75.00 1280x720 60.00 1024x768 75.08 70.07 60.00 832x624 74.55 800x600 72.19 75.00 60.32 56.25 640x480 75.00 72.81 66.67 60.00 720x400 70.08 DP2-2 disconnected (normal left inverted right x axis y axis) DP2-3 disconnected (normal left inverted right x axis y axis) HDMI1 disconnected (normal left inverted right x axis y axis) HDMI2 disconnected (normal left inverted right x axis y axis) VIRTUAL1 disconnected (normal left inverted right x axis y axis) Attaching screenshots, compare UI sizes between left and right display.
Created attachment 1148543 [details] normal size
Created attachment 1148544 [details] bigger size
I have the same problem here with my three screens.
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