Comment 19 for bug 130979

I also experience this bug. I'm completely ignorant apart from my knowledge of the information below:

xserver-xorg-video-ati:
  Installed: 1:6.12.99+git20090531.7599dc40-0ubuntu0tormod

01:00.0 VGA compatible controller [0300]: ATI Technologies Inc Mobility Radeon HD 3400 Series [1002:95c4]
 Subsystem: Dell Device [1028:029f]
 Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx-
 Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR+ <PERR- INTx-
 Latency: 0, Cache Line Size: 64 bytes
 Interrupt: pin A routed to IRQ 16
 Region 0: Memory at d0000000 (32-bit, prefetchable) [size=256M]
 Region 1: I/O ports at 2000 [size=256]
 Region 2: Memory at cfef0000 (32-bit, non-prefetchable) [size=64K]
 [virtual] Expansion ROM at cfe00000 [disabled] [size=128K]
 Capabilities: <access denied>

Relevant lines from dmesg after resume:

[46786.933471] [drm] Resetting GPU
[46795.967413] Modules linked in: usblp aes_x86_64 aes_generic ecb binfmt_misc ppdev radeon drm bridge stp bnep vboxnetflt vboxdrv kqemu input_polldev dm_crypt sbp2 lp parport joydev btusb psmouse dcdbas iTCO_wdt iTCO_vendor_support serio_raw pcspkr ricoh_mmc sdhci_pci sdhci ieee80211_crypt_tkip wl(P) ieee80211_crypt uvcvideo compat_ioctl32 videodev v4l1_compat snd_hda_intel snd_pcm_oss snd_mixer_oss snd_pcm snd_seq_dummy snd_seq_oss snd_seq_midi snd_rawmidi snd_seq_midi_event video output snd_seq snd_timer snd_seq_device snd soundcore snd_page_alloc intel_agp usbhid ohci1394 ieee1394 tg3 fbcon tileblit font bitblit softcursor
[46816.902145] [drm] Loading RV620 CP Microcode
[46816.902478] [drm] Loading RV620 PFP Microcode
[46816.917417] [drm] Resetting GPU