Bug#683327: [wheezy] corrupted screen using KMS and Radeon 6550D and missing (non-free) firmware

[Ivan Shmakov <oneingray@gmail.com>]

>>>>> Jonathan Nieder <jrnieder@gmail.com> writes:
>>>>> Ivan Shmakov wrote:

[…]

 >> FTR: this bug also manifests itself with the newer

 > Why the indent?

	For symmetry.  (If the question is about the leading TAB, that
	is.)

 >> linux-image-3.2.0-4-amd64 package (as of 3.2.32-1) and
 >> A8-3870-integrated Radeon HD 6550D graphics.  (Or should I try the
 >> version currently in Sid?)

 > Yes, please do.  It contains the following change, which we want to
 > ensure works well.

 > * radeon: Disable KMS earlier if firmware is not installed (Closes:
 > #607194)

	ACK, thanks!

	As of 3.2.35-2, the issue seems to be no more (at least on one
	of my hosts.)  The KMS is not enabled when there's no firmware,
	and then correctly enabled should firmware be installed and the
	‘radeon’ module reloaded, like:

[   10.931935] [drm] radeon kernel modesetting disabled; it requires firmware-linux-nonfree.
[   10.934973] [drm] Initialized radeon 1.33.0 20080528 for 0000:00:01.0 on minor 0

# rmmod radeon 
# insmod /lib/modules/3.2.0-4-amd64/kernel/drivers/gpu/drm/radeon/radeon.ko \
      modeset=1 
# 

[  654.039721] [drm] radeon kernel modesetting enabled.

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