https://bugs.freedesktop.org/show_bug.cgi?id=81644
--- Comment #136 from Alex Deucher agd5f@yahoo.com --- (In reply to comment #131)
I have just played a youtube video (coincidentally the youtube message from AMD's John Byrne regarding Catalyst!) and I have just checked that the following messages show up in the dmesg log:
[ 2053.298531] radeon 0000:05:00.0: Packet0 not allowed! [ 2058.548486] radeon 0000:05:00.0: Packet0 not allowed! [ 2166.793537] radeon 0000:05:00.0: Packet0 not allowed!
These indicate that userspace is sending a broken command stream (e.g., a bad count for a packet most likely). The kernel will reject the command stream if a bad one is encountered. There still could be a bug in the command stream setup in userspace that is just masked in other cases due to the layout of the commands.