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)
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.
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
800x600 60.32 56.25
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
1280x1024 75.02 60.02
1024x768 75.08 70.07 60.00
800x600 72.19 75.00 60.32 56.25
640x480 75.00 72.81 66.67 60.00
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]
Created attachment 1148544 [details]
I have the same problem here with my three screens.
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