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?