Comment 9 for bug 1178846

Here some more information

1. Attempt to change refresh rate
Show the output configuration:

sudo xrandr

Screen 0: minimum 320 x 200, current 1920 x 1080, maximum 16384 x 16384
DisplayPort-0 connected 1920x1080+0+0 (normal left inverted right x axis y axis) 509mm x 286mm
   1920x1080 60.0*+
   1600x1200 60.0
   1680x1050 59.9
   1600x900 60.0
   1280x1024 60.0
   1440x900 59.9
   1280x720 60.0
   1024x768 60.0
   800x600 60.3
   640x480 60.0
   720x400 70.1
DisplayPort-1 disconnected (normal left inverted right x axis y axis)

Trying to change the refresh rate does not work

sudo xrandr --output DisplayPort-1 --mode 1920x1080 --rate 50

xrandr: cannot find mode 1920x1080

Anybody has an idea how I can change the refresh rate manually (or a manual xorg.conf should look like)?

2. Mesa
Show the actual state of mesa:

sudo dpkg -l | grep mesa

ii libegl1-mesa:amd64 9.1.1-0ubuntu3 amd64 free implementation of the EGL API -- runtime
ii libegl1-mesa-drivers:amd64 9.1.1-0ubuntu3 amd64 free implementation of the EGL API -- hardware drivers
ii libgl1-mesa-dri:amd64 9.1.1-0ubuntu3 amd64 free implementation of the OpenGL API -- DRI modules
ii libgl1-mesa-glx:amd64 9.1.1-0ubuntu3 amd64 free implementation of the OpenGL API -- GLX runtime
ii libglapi-mesa:amd64 9.1.1-0ubuntu3 amd64 free implementation of the GL API -- shared library
ii libgles2-mesa:amd64 9.1.1-0ubuntu3 amd64 free implementation of the OpenGL|ES 2.x API -- runtime
ii libglu1-mesa:amd64 9.0.0-0ubuntu1 amd64 Mesa OpenGL utility library (GLU)
ii libopenvg1-mesa:amd64 9.1.1-0ubuntu3 amd64 free implementation of the OpenVG API -- runtime

Show available versions:
(install apt-get-versions by: sudo apt-get install apt-show-versions)

apt-show-versions -p libegl1-mesa
libegl1-mesa/raring uptodate 9.1.1-0ubuntu3

looks like everything is up-to-date