[Mesa-dev] [Bug 104655] AMD R9 Fury + BenQ XL2546: Setting 240 Hz results in screen distortion

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=104655

            Bug ID: 104655
           Summary: AMD R9 Fury + BenQ XL2546: Setting 240 Hz results in
                    screen distortion
           Product: Mesa
           Version: unspecified
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Other
          Assignee: mesa-dev at lists.freedesktop.org
          Reporter: ominous at autistici.org
        QA Contact: mesa-dev at lists.freedesktop.org

I recently obtained this monitor and running it on Debian via an AMD R9 Fury.

When I try to set the monitor at 1920 x 1080 @ 240 Hz it will show distortion
on the right side of the screen, and the screen reports to be running at 1920 x
1080 @ 241 Hz via the Information section of the monitor's OSD.

This does not happen on Windows. I have tested this on Debian stable, Debian
testing and Ubuntu 17.10, with all expressing the same result.

The value is 239.76, yet when I switch to it, the monitor will report 241 Hz,
which most likely causes the screen distortion.

user at fdt:~$ xrandr
Screen 0: minimum 320 x 200, current 1920 x 1080, maximum 16384 x 16384
DisplayPort-0 connected primary 1920x1080+0+0 (normal left inverted right x
axis y axis) 544mm x 303mm
   1920x1080     60.00 + 239.76   143.98*  119.98    99.93    50.00    59.94  
   1920x1080i    60.00    50.00    59.94  
   1680x1050     59.95  
   1600x900      60.00  
   1280x1024    239.77   120.05    75.02    60.02  
   1280x800      59.81  
   1152x864      75.00  
   1280x720      60.00    50.00    59.94  
   1024x768      75.03    60.00  
   832x624       74.55  
   800x600       75.00    60.32  
   720x576       50.00  
   720x480       60.00    59.94  
   640x480       75.00    60.00    59.94  
   720x400       70.08  
DisplayPort-1 disconnected (normal left inverted right x axis y axis)
DisplayPort-2 disconnected (normal left inverted right x axis y axis)
HDMI-A-0 disconnected (normal left inverted right x axis y axis)
DVI-D-0 disconnected (normal left inverted right x axis y axis)

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