I would kindly ask framebuffer users to test fbcat on their systems. Due
to limited hardware base we are unable to check whether fbcat works
correctly on less popular framebuffers.
If you would like to help us, the following steps should be followed:
1) Make sure that your framebuffer isn't present in our tested.txt.
2) Install fbcat on your machine.
3) Do `fbcat >screenshot.ppm` and check whether a PPM image of your
framebuffer is correctly grabbed.
4) File a bug report (using reportbug) with feedback if it has worked.
Our bug report script (/usr/share/bug/fbcat) uses fbset to report
parameters of your framebuffer so make sure that fbset is installed.
If you would like to get a PNG image instead of PPM, you can use fbgrab
wrapper (which is also provided by fbcat package).