This still happens but it seems to have happened while switching from lightdm
to gnome-session.
Here it changes the display resolution and shows the background of lightdm
several times as mosaik across the screen.
[ 44.805941] EXT4-fs (dm-3): re-mounted. Opts: commit=0
[ 51.624571] [drm] force priority to high
[ 51.626145] [drm] force priority to high
[ 54.848254] eth0: no IPv6 routers present
[ 87.672273] [drm:drm_mode_getfb] *ERROR* invalid framebuffer id
[ 98.128006] [drm:atom_op_jump] *ERROR* atombios stuck in loop for more than
5secs aborting
[ 98.128013] [drm:atom_execute_table_locked] *ERROR* atombios stuck executing
E1E8 (len 2585, WS 4, PS 4) @ 0xE8D2
[ 102.324596] [drm] force priority to high
[ 102.336424] [drm:radeon_dp_get_link_status] *ERROR* displayport link status
failed
[ 102.336426] [drm:radeon_dp_link_train_cr] *ERROR* clock recovery failed
[ 119.680350] init: tty2 main process ended, respawning
[ 121.851756] [drm:drm_mode_getfb] *ERROR* invalid framebuffer id
[ 121.851830] [drm] force priority to high
[ 158.560036] eth0: no IPv6 routers present
the mouse hanging could be at the time of
[drm] force priority to high
** Changed in: linux (Ubuntu)
Status: Incomplete => Confirmed
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https://bugs.launchpad.net/bugs/859171
Title:
[ATI Radeon] System unresponsive for short time within Lightdm
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