https://bugs.freedesktop.org/show_bug.cgi?id=85320
--- Comment #17 from Daniele daniele.rogora@gmail.com --- I see the same happening here with a HD4200 (RS880) GPU.
I tried with:
- kernel 3.18rc3 - latest radeon ucode firmware files from the 23rd of August - updated mesa, xserver and libs from the oibaf ubuntu ppa
I observed the same behavior: video starts well for a second, then the image freeze (but mouse cursor is still alive) and I can't do anything, not even switching to another vt. After a while the screen becomes black.
In the meantime I can hear the sound of the video correctly, and indeed if I log in with ssh from another pc everything is working well; still xserver doesn't work until a reboot is performed.
I attach a piece of the dmesg log taken from the ssh session right after the video was played where the GPU hang is reported. Xorg doesn't log any error.