Comment # 44 on bug 111481 from Marko Popovic

Another Update:

Unfortunately even with WIP patch applied I got another random desktop freeze
in Gnome shell of SDMA type.

Turned back the nodma tweak in order to avoid having those until further fixes
are found.

Another note: I use the most recent firmware libraries and there don't seem to
be any improvements on the sdma freezes front.