Bug#742307: xserver-xorg-video-radeon: Radeon HD 6570 ("Turks") - severe display corruption esp. after boot

[Benjamin Moody <benjamin.moody@gmail.com>]

To follow up on this issue:

Another person who was having similar problems contacted me privately
(thank you!) and informed me that adding "radeon.dpm=1" to the kernel
command line seems to fix the problem.

I've done so, and it now seems to be working perfectly with kernel
3.13.10-1~bpo70+1.

However:

 - the stable kernel is still broken, as it doesn't support the
"radeon.dpm" option (and I have no idea how hard it would be to
backport);

 - the backports kernel is broken, too, since dpm is not enabled by
default for this card.

Benjamin