https://bugs.freedesktop.org/show_bug.cgi?id=38010
--- Comment #5 from Rafał Miłecki zajec5@gmail.com 2012-01-30 00:22:39 PST --- darkbasic: I've request to you, could you try switching to some updated kernel and trying radeon.audio=1 option in GRUB?
In case of 3.0, please use 3.0.18 or newer. In case of 3.1, please use 3.1.10 or newer. In case of 3.2. please use 3.2.2 or newer. Of course 3.3-rc1 is good as well.
The commit I want you to have is:
commit d21e9677f82d619967c6c918038343fe12bb0f4a Author: Rafał Miłecki zajec5@gmail.com Date: Fri Dec 23 20:32:18 2011 +0100
drm/radeon/kms: workaround invalid AVI infoframe checksum issue
Does you LG work fine with radeon after using radeon.audio=1?