Manually adding resolution works.

$ xrandr --newmode 1920x1080 148.5 1920 2008 2052 2200 1080 1089 1095 1125 
+hsync +vsync
$ xrandr --addmode DisplayPort-1 1920x1080
$ xrandr --output DisplayPort-1 --mode 1920x1080

Seems like the problem is related to detecting display modes.

Note that the display was able to handle refresh rate up to 144Hz.

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https://bugs.launchpad.net/bugs/1552693

Title:
  Radeon driver only provides 1024x768 resolution

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