Unity (launcher, panel) becomes unresponsive when all windows are minimized

I experience this same problem.

It appears to occur when the last open window is minimized. The CPU will experience heavy load (see attached top) and in my experience the processes do not stop until the user attempts to interact with the Launcher.

Same symptoms as indicated above.

Also Precise 64-bit with NVIDIA drivers (several versions) and TwinView setup. I did an upgrade from 11.04 -> 11.10 -> 12.04.

seeing this as well with 64-bit with NVIDIA drivers wand twinview setup under precise

I am experiencing this problem as well. However, I have Intel Sandybridge integrated graphics on a single monitor setup. Fresh install of 12.04 64-bit.

so i started a batch top capture and then minimized all my windows (including top capture shell ), system hangs for more than 5 seconds before i can click anything, then i open restore top capture shell

top -b > top.log

grep PID -A 10 top.log

here's some interesting output when all windows minimized , note only middle entries are the relevant parts to the bug

  PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
 9880 rhuddusa 10 -10 1021m 41m 28m S 6 0.5 3:45.07 vlc
 3925 rhuddusa 21 1 854m 204m 47m S 4 2.6 6:00.96 chrome
 4942 rhuddusa 20 0 922m 86m 22m S 2 1.1 4:33.05 chrome
11039 rhuddusa 20 0 17336 1316 916 R 2 0.0 0:00.01 top
21595 root 20 0 335m 233m 28m S 2 2.9 77:41.10 Xorg
22500 rhuddusa 20 0 1280m 266m 49m S 2 3.3 45:12.97 compiz
22527 rhuddusa 0 -20 410m 6992 4828 S 2 0.1 6:33.12 pulseaudio
    1 root 20 0 24456 2444 1380 S 0 0.0 0:01.85 init
    2 root 20 0 0 0 0 S 0 0.0 0:00.04 kthreadd
    3 root 20 0 0 0 0 S 0 0.0 0:03.93 ksoftirqd/0
--
  PID USER PR NI VIRT RES SHR S %CPU %MEM TIME+ COMMAND
21595 root 20 0 340m 238m 33m R 23 3.0 77:41.79 Xorg
22500 rhuddusa 20 0 1280m 266m 49m R 16 3.3 45:13.45 compiz
 9880 rhuddusa 10 -10 1021m 41m 28m S 5 0.5 3:45.23 vlc
10935 rhuddusa 20 0 522m 16m 10m S 4 0.2 0:00.88 gnome-terminal ...