I tried installing beryl on debian unstable. I then ran it using the command bery I got the following:
Detected xserver : AIGLX Checking Display :0.0 ... Checking for XComposite extension : failed No composite extension beryl: No composite extension I have VT8387 VGA controller. Running lspci gives the folllowing result: 01:00.0 VGA compatible controller: VIA Technologies, Inc. VT8378 [S3 UniChrome] Integrated Video (rev 01) -- Ori Idan