[systemsettings] [Bug 322653] New: Setup for rotated displays is not saved correctly

[Bogdan]

https://bugs.kde.org/show_bug.cgi?id=322653

            Bug ID: 322653
           Summary: Setup for rotated displays is not saved correctly
    Classification: Unclassified
           Product: systemsettings
           Version: unspecified
          Platform: Other
                OS: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: kcm_randr
          Assignee: unassigned-bugs at kde.org
          Reporter: bogdanb at gmail.com
                CC: hbock at providence.edu

I have a multi-monitor setup and I recently noticed that I was affected by bug
#183143. I looked into some of the work-arounds posted there, but while doing
so I noticed that the xrandr line written into krandrrc for the rotated screen
is wrong (i.e., xrandr does not accept it).

Reproducible: Always

Steps to Reproduce:
1. Get a multi-monitor setup;
2. Rotate one of the screens;
3. Save the configuration as default;
4. Examine the StartupCommands line in ~/.kde/share/config/krandrrc, and
isolate the command for the rotated screen.
Actual Results:  
xrandr --output DVI-I-1 --pos 1920x0 --mode 1200x1920 --rotate left --refresh
59.9502

Expected Results:  
xrandr --output DVI-I-1 --pos 1920x0 --mode 1920x1200 --rotate left --refresh
59.9502

If you’re wondering what the difference is, it’s the mode. 

$ xrandr --output DVI-I-1 --pos 1920x0 --mode 1200x1920 --rotate left --refresh
59.9502
xrandr: cannot find mode 1200x1920

For some reason whoever generates the krandrrc rotates the mode according to
the screen rotation. Apparently xrandr wants to set the mode in unrotated
coordinates, which sort of makes sense. (Presumably the mode is needed to
configure the data link to the screen, which doesn’t care if the image is
rotated. I’m not sure where those refresh values come from, xrandr shows 60.0.)

This is the configuration I’m supposed to have:

$ xrandr 
Screen 0: minimum 8 x 8, current 3120 x 1920, maximum 8192 x 8192
DVI-I-0 disconnected (normal left inverted right x axis y axis)
VGA-0 disconnected (normal left inverted right x axis y axis)
DVI-I-1 connected 1200x1920+1920+0 left (normal left inverted right x axis y
axis) 546mm x 352mm
   1920x1200      60.0*+   59.9  
   1680x1050      60.0  
   1600x1200      60.0  
   1600x1000      60.0  
   1280x1024      75.0     60.0  
   1280x960       60.0  
   1024x768       75.0     60.0  
   800x600        75.0     60.3  
   640x480        75.0     59.9  
HDMI-0 connected 1920x1200+0+430 (normal left inverted right x axis y axis)
546mm x 352mm
   1920x1200      60.0*+
   1920x1080      59.9     50.0     30.0     30.0     25.0  
   1680x1050      60.0  
   1600x1200      60.0  
   1600x1000      60.0  
   1280x1024      75.0  
   1280x960       60.0  
   1280x720       60.0     59.9     50.0  
   1024x768       75.0     60.0  
   800x600        75.0     60.3  
   720x576        50.0     25.0  
   720x480        59.9     30.0  
   640x480        75.0     59.9     59.9

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