I installed Debian 8.3 LXDE today and I cannot adjust the resolution of my monitor. I have a 1920x1080 resolution, but allows you to install Debian to me only 1280x1024. I tried to make as here: https://wiki.archlinux.org/index.php/xrandr, using xrandr to do manually, but there is no connected interfaces:

drahenfels@debian:~$ xrandr 
xrandr: Failed to get size of gamma for output default
Screen 0: minimum 640 x 400, current 1280 x 1024, maximum 1280 x 1024
default connected 1280x1024+0+0 0mm x 0mm
1280x1024      0.00* 
1152x864       0.00  
1024x768       0.00  
800x600        0.00  
640x480        0.00  
720x400        0.00 

My GPU: AMD/ATI RS780L [Radeon 3000]

  • check in /var/log/Xorg.0.log. Probably the wrong driver took priority (possibly VESA). – Giacomo Catenazzi Mar 18 '16 at 20:15

You probably need some non-free firmware/driver for your video card. Read https://wiki.debian.org/AtiHowTo

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