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alexmalmis@PC:~$ xrandr
xrandr: Failed to get size of gamma for output default
Screen 0: minimum 800 x 600, current 800 x 600, maximum 800 x 600
default connected 800x600+0+0 0mm x 0mm
800x600 75.00*
Maybe the drivers is not installed. The output of lspci | grep VGA is
Since you did not mention firmware, my first guess is, you need firmware. Go thru the wiki and see if you can get it working. https://wiki.debian.org/AtiHowTo
Look thru the whole output of lspci and make sure you have only one display device. There are a few systems with hybrid graphics.
sudo apt-get install firmware-linux
Reading package lists... Done
Building dependency tree
Reading state information... Done
Package firmware-linux is not available, but is referred to by another package.
This may mean that the package is missing, has been obsoleted, or
is only available from another source
E: Package 'firmware-linux' has no installation candidate
Don't stab blindly, that is a classic newbie mistake. Follow instructions in the wiki. Add non-free and contrib to sources.list and install the firmware-amd-graphics pkg. If that doesn't get it working, then try backports for a newer kernel and firmware.
There are instructions in there about how to confirm the firmware is loading, check dmesg.