.782532] BUG: soft lockup - CPU#1 stuck for 503s! [Xorg:897]
Modules linked in: nls_iso8859_1 nls_cp437 vfat fat nls_utf8 isofs binfmt_misc snd_hda_codec_realtek snd_hda_intel radeon snd_hda_codec arc4 snd_hwdep snd_pcm rt61pci crc_itu_t snd_seq_midi rt2x00pci rt2x00lib ttm led_class snd_rawmidi mac80211 drm_kms_helper snd_seq_midi_event snd_seq snd_timer snd_seq_device ppdev drm snd cfg80211 ati_agp psmouse soundcore parport_pc serio_raw eeprom_93cx6 i2c_piix4 snd_page_alloc i2c_algo_bit agpgart lp parport usb_storage floppy 8139too 8139cp pata_atiixp sata_sil mii
Modules linked in: nls_iso8859_1 nls_cp437 vfat fat nls_utf8 isofs binfmt_misc snd_hda_codec_realtek snd_hda_intel radeon snd_hda_codec arc4 snd_hwdep snd_pcm rt61pci crc_itu_t snd_seq_midi rt2x00pci rt2x00lib ttm led_class snd_rawmidi mac80211 drm_kms_helper snd_seq_midi_event snd_seq snd_timer snd_seq_device ppdev drm snd cfg80211 ati_agp psmouse soundcore parport_pc serio_raw eeprom_93cx6 i2c_piix4 snd_page_alloc i2c_algo_bit agpgart lp parport usb_storage floppy 8139too 8139cp pata_atiixp sata_sil mii

Pid: 897, comm: Xorg Not tainted 2.6.35-22-generic #32-Ubuntu D101GGC                        /        
EIP: 0060:[<c0159099>] EFLAGS: 00203207 CPU: 1
EIP is at run_timer_softirq+0x139/0x210
EAX: f7090000 EBX: f0c6bf24 ECX: 000ad72d EDX: f0c6bf24
ESI: f7090000 EDI: f0c6bf24 EBP: f0c6bf38 ESP: f0c6bef8
 DS: 007b ES: 007b FS: 00d8 GS: 00e0 SS: 0068
Process Xorg (pid: 897, ti=f0c6a000 task=f1350000 task.ti=f0c6a000)
Stack:
 f0c6bf24 c0175802 809c86d9 000002db f0c6bf38 f7090e10 f7090c10 f7090a10
<0> 00000000 c0172250 f7090810 f0c6bf24 f0c6bf24 00000004 00000141 00000001
<0> f0c6bf80 c015127c f0648630 b63c6000 f2366c38 809a5f58 000002db c2104264
Call Trace: