On Mon, 2015-11-30 at 23:11 -0800, Marc Shapiro wrote:
In Wheezy, the graphics card seems to have been found and a depth of
24bpp is being used by RADEON(0) with a GB of graphics memory, while
in
Jessie, Screen 0 is getting deleted and the radeon module is removed.
Instead of RADEON(0) we see FBDEV(0), instead of 24bbp, only 16bbp is
being used. Only 1536kB of video memory is being used and the screen
size is set to "Virtual size is 1024x768 (pitch 1024)".
I don't know enough to determine what is causing these differences,
let
alone how to correct the problem. If someone else can figure out a
solution I would be most grateful.
Most likely missing firmware as others have suggested, check dmesg and
grep for radeon and/or drm.