This affects also Ubuntu 13.04, it could be the same bug as
 
- https://bugs.launchpad.net/ubuntu/+source/unity/+bug/892544
- https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/887993
- https://bugs.launchpad.net/ubuntu/+source/compiz/+bug/1004475
- https://bugs.launchpad.net/compiz/+bug/1113325

and maybe there are more of them. In the other Bugreports it seems, that
the Gallium radeon driver has something to do with the problems.

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https://bugs.launchpad.net/bugs/887993

Title:
  desktop sluggish after resume from suspend

Status in Unity:
  Confirmed
Status in “xorg” package in Ubuntu:
  Confirmed

Bug description:
  after resuming from suspend unity/ compiz feels like it renders much less 
frames per second. Moving windows around is very jerky as are the animations of 
the sidebar.
  While moving around a window the Xorg CPU utilization spikes to 48%, so its 
eating up one of my 2 cores.

  logging out and logging in again solves the problem. Switching to VTs
  however does not.

  furthermore I got this on my kernel log:

  Nov  9 11:51:32 deepblue kernel: [39839.124572] ------------[ cut here 
]------------
  Nov  9 11:51:32 deepblue kernel: [39839.124580] WARNING: at 
/build/buildd/linux-3.0.0/kernel/power/suspend_test.c:53 
suspend_test_finish+0x89/0x90()
  Nov  9 11:51:32 deepblue kernel: [39839.124582] Hardware name: 2007FVG
  Nov  9 11:51:32 deepblue kernel: [39839.124584] Component: resume devices, 
time: 10812
  Nov  9 11:51:32 deepblue kernel: [39839.124587] Modules linked in: bnep 
rfcomm parport_pc ppdev binfmt_misc joydev snd_hda_codec_analog pcmcia 
snd_hda_intel snd_hda_codec snd_hwdep snd_pcm snd_seq_midi hdj_mod btusb arc4 
bluetooth snd_rawmidi snd_seq_midi_event ath9k yenta_socket psmouse pcmcia_rsrc 
serio_raw pcmcia_core mac80211 ath9k_common snd_seq ath9k_hw thinkpad_acpi 
nvram nsc_ircc irda ath radeon snd_timer snd_seq_device crc_ccitt tpm_tis 
cfg80211 video snd ttm drm_kms_helper drm i2c_algo_bit soundcore snd_page_alloc 
lp parport usbhid hid ahci libahci xhci_hcd e1000e btrfs zlib_deflate libcrc32c
  Nov  9 11:51:32 deepblue kernel: [39839.124644] Pid: 20240, comm: pm-suspend 
Not tainted 3.0.0-13-generic #22-Ubuntu
  Nov  9 11:51:32 deepblue kernel: [39839.124646] Call Trace:
  Nov  9 11:51:32 deepblue kernel: [39839.124652]  [<c1047982>] 
warn_slowpath_common+0x72/0xa0
  Nov  9 11:51:32 deepblue kernel: [39839.124666]  [<c1084af9>] ? 
suspend_test_finish+0x89/0x90
  Nov  9 11:51:32 deepblue kernel: [39839.124670]  [<c1084af9>] ? 
suspend_test_finish+0x89/0x90
  Nov  9 11:51:32 deepblue kernel: [39839.124674]  [<c1047a53>] 
warn_slowpath_fmt+0x33/0x40
  Nov  9 11:51:32 deepblue kernel: [39839.124678]  [<c1084af9>] 
suspend_test_finish+0x89/0x90
  Nov  9 11:51:32 deepblue kernel: [39839.124681]  [<c108483a>] 
suspend_devices_and_enter+0xba/0x180
  Nov  9 11:51:32 deepblue kernel: [39839.124685]  [<c10849fe>] 
enter_state+0xfe/0x130
  Nov  9 11:51:32 deepblue kernel: [39839.124688]  [<c1083f4a>] 
state_store+0x8a/0xc0
  Nov  9 11:51:32 deepblue kernel: [39839.124692]  [<c1083ec0>] ? 
pm_trace_dev_match_show+0x20/0x20
  Nov  9 11:51:32 deepblue kernel: [39839.124697]  [<c127eecb>] 
kobj_attr_store+0x1b/0x30
  Nov  9 11:51:32 deepblue kernel: [39839.124702]  [<c1185656>] 
sysfs_write_file+0xa6/0x100
  Nov  9 11:51:32 deepblue kernel: [39839.124716]  [<c112876f>] 
vfs_write+0x8f/0x160
  Nov  9 11:51:32 deepblue kernel: [39839.124719]  [<c11855b0>] ? 
sysfs_poll+0x80/0x80
  Nov  9 11:51:32 deepblue kernel: [39839.124723]  [<c1128a4d>] 
sys_write+0x3d/0x70
  Nov  9 11:51:32 deepblue kernel: [39839.124727]  [<c152cc24>] 
syscall_call+0x7/0xb
  Nov  9 11:51:32 deepblue kernel: [39839.124730] ---[ end trace 
307b324cec6bf296 ]---

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