I can tell by eye that my monitor is running at 1920x1080, but I want to confirm that it is running at 60hz. However, running xrandr
gives the following output:
xrandr: Failed to get size of gamma for output default
Screen 0: minimum 640 x 480, current 1920 x 1080, maximum 1920 x 1080
default connected 1920x1080+0+0 0mm x 0mm
1920x1080 0.0*
1024x768 0.0
800x600 0.0
640x480 0.0
So it recognizes the screen and resolution properly, but for some reason it doesn't know about the refresh rate.
Note: I just installed a fresh copy of debian stable (wheezy). I did not include a desktop environment, so don't assume I have all the standard graphics libraries. I manually installed xorg xcb libxcb-util0-dev libxcb-ewmh-dev libxcb-randr0-dev libxcb-icccm4-dev libxcb-keysyms1-dev libxcb-xinerama0-dev
and am running bspwm as my window manager.
I tried booting into tails (which has many, if not all, of the standard graphics packages) and had the same problem though. It recognizes the resolution but says 0.0 for the framerate.
How can I figure out what refresh rate I'm running?