Looked into this a bit more and tried turning on additional debugging information for kms by adding "drm.kernel=0x04" to the grub cmdline. The dmesg output is attached.
It looks like the issue is a warning generated around 78.3302, containing the text "WARNING: at /build/buildd/linux-2.6.38/kernel/power/suspend_test.c:53 suspend_test_finish+0x86/0x90()", while the radeon module is resuming.
Looked into this a bit more and tried turning on additional debugging information for kms by adding "drm.kernel=0x04" to the grub cmdline. The dmesg output is attached.
It looks like the issue is a warning generated around 78.3302, containing the text "WARNING: at /build/ buildd/ linux-2. 6.38/kernel/ power/suspend_ test.c: 53 suspend_ test_finish+ 0x86/0x90( )", while the radeon module is resuming.