Same problem, with version: 1:0.9.4+bzr20110406-0ubuntu1


this is my syslog

Apr  7 14:41:00 alessio kernel: [  319.120950] radeon 0000:02:00.0:   R_000E50_SRBM_STATUS=0x200080C0
Apr  7 14:41:00 alessio kernel: [  319.121948] radeon 0000:02:00.0: GPU reset succeed
Apr  7 14:41:00 alessio kernel: [  319.161652] radeon 0000:02:00.0: WB enabled
Apr  7 14:41:00 alessio kernel: [  319.200500] [drm] ring test succeeded in 1 usecs
Apr  7 14:41:00 alessio kernel: [  319.200515] [drm] ib test succeeded in 1 usecs
Apr  7 14:41:00 alessio kernel: [  319.200520] [drm] Enabling audio support
Apr  7 14:41:00 alessio kernel: [  319.200547] HDMI hot plug event: Pin=3 Presence_Detect=0 ELD_Valid=0
Apr  7 14:41:15 alessio kernel: [  334.504074] radeon 0000:02:00.0: GPU lockup CP stall for more than 10000msec
Apr  7 14:41:15 alessio kernel: [  334.504083] ------------[ cut here ]------------
Apr  7 14:41:15 alessio kernel: [  334.504139] WARNING: at /build/buildd/linux-2.6.38/drivers/gpu/drm/radeon/radeon_fence.c:248 radeon_fence_wait+0x2ea/0x350 [radeon]()
Apr  7 14:41:15 alessio kernel: [  334.504146] Hardware name: HP Compaq dx2450 Microtower PC
Apr  7 14:41:15 alessio kernel: [  334.504151] GPU lockup (waiting for 0x000007CC last fence id 0x000007C9)
Apr  7 14:41:15 alessio kernel: [  334.504156] Modules linked in: parport_pc ppdev snd_hda_codec_hdmi snd_hda_codec_realtek binfmt_misc vboxnetadp vboxnetflt vboxdrv snd_hda_intel snd_hda_codec snd_hwdep snd_pcm radeon snd_seq_midi snd_rawmidi snd_seq_midi_event ttm snd_seq snd_timer drm_kms_helper snd_seq_device drm psmouse snd serio_raw soundcore k8temp i2c_algo_bit snd_page_alloc i2c_nforce2 lp parport forcedeth sata_nv
Apr  7 14:41:15 alessio kernel: [  334.504209] Pid: 1454, comm: compiz Tainted: G        W   2.6.38-7-generic #39-Ubuntu
Apr  7 14:41:15 alessio kernel: [  334.504214] Call Trace:
Apr  7 14:41:15 alessio kernel: [  334.504230]  [<c104f912>] ? warn_slowpath_common+0x72/0xa0
Apr  7 14:41:15 alessio kernel: [  334.504266]  [<f855b5da>] ? radeon_fence_wait+0x2ea/0x350 [radeon]
Apr  7 14:41:15 alessio kernel: [  334.504300]  [<f855b5da>] ? radeon_fence_wait+0x2ea/0x350 [radeon]
Apr  7 14:41:15 alessio kernel: [  334.504309]  [<c104f9e3>] ? warn_slowpath_fmt+0x33/0x40
Apr  7 14:41:15 alessio kernel: [  334.504344]  [<f855b5da>] ? radeon_fence_wait+0x2ea/0x350 [radeon]
Apr  7 14:41:15 alessio kernel: [  334.504356]  [<c106d290>] ? autoremove_wake_function+0x0/0x50
Apr  7 14:41:15 alessio kernel: [  334.504390]  [<f855be41>] ? radeon_sync_obj_wait+0x11/0x20 [radeon]
Apr  7 14:41:15 alessio kernel: [  334.504408]  [<f8375719>] ? ttm_bo_wait+0xd9/0x170 [ttm]
Apr  7 14:41:15 alessio kernel: [  334.504423]  [<f8377dc2>] ? ttm_bo_move_accel_cleanup+0x162/0x1e0 [ttm]
Apr  7 14:41:15 alessio kernel: [  334.504459]  [<f855c11a>] ? radeon_move_blit.clone.0+0x13a/0x1b0 [radeon]
Apr  7 14:41:15 alessio kernel: [  334.504495]  [<f855c3d5>] ? radeon_move_ram_vram.clone.2+0x105/0x120 [radeon]
Apr  7 14:41:15 alessio kernel: [  334.504510]  [<f83759f2>] ? ttm_bo_list_ref_sub+0x22/0x30 [ttm]
Apr  7 14:41:15 alessio kernel: [  334.504549]  [<f855c59a>] ? radeon_bo_move+0x1aa/0x1c0 [radeon]
Apr  7 14:41:15 alessio kernel: [  334.504564]  [<f83761c0>] ? ttm_bo_unmap_virtual_locked+0x50/0x60 [ttm]
Apr  7 14:41:15 alessio kernel: [  334.504599]  [<f855c3f0>] ? radeon_bo_move+0x0/0x1c0 [radeon]
Apr  7 14:41:15 alessio kernel: [  334.504614]  [<f83762fd>] ? ttm_bo_handle_move_mem+0x12d/0x380 [ttm]
Apr  7 14:41:15 alessio kernel: [  334.504651]  [<f855d8a0>] ? radeon_bo_move_notify+0x0/0x30 [radeon]
Apr  7 14:41:15 alessio kernel: [  334.504666]  [<f8377195>] ? ttm_bo_move_buffer+0x125/0x140 [ttm]
Apr  7 14:41:15 alessio kernel: [  334.504680]  [<f83759f2>] ? ttm_bo_list_ref_sub+0x22/0x30 [ttm]
Apr  7 14:41:15 alessio kernel: [  334.504697]  [<f8377258>] ? ttm_bo_validate+0xa8/0x120 [ttm]
Apr  7 14:41:15 alessio kernel: [  334.504733]  [<f855d4a3>] ? radeon_bo_list_validate+0x73/0xd0 [radeon]
Apr  7 14:41:15 alessio kernel: [  334.504774]  [<f8574509>] ? radeon_cs_parser_relocs+0x209/0x250 [radeon]
Apr  7 14:41:15 alessio kernel: [  334.504815]  [<f8574799>] ? radeon_cs_parser_init+0x249/0x2a0 [radeon]
Apr  7 14:41:15 alessio kernel: [  334.504855]  [<f8574915>] ? radeon_cs_ioctl+0x75/0x180 [radeon]
Apr  7 14:41:15 alessio kernel: [  334.504884]  [<f82a5cd1>] ? drm_ioctl+0x1e1/0x470 [drm]
Apr  7 14:41:15 alessio kernel: [  334.504927]  [<f85748a0>] ? radeon_cs_ioctl+0x0/0x180 [radeon]
Apr  7 14:41:15 alessio kernel: [  334.505008]  [<c1101467>] ? handle_mm_fault+0xb7/0x120
Apr  7 14:41:15 alessio kernel: [  334.504927]  [<f85748a0>] ? radeon_cs_ioctl+0x0/0x180 [radeon]
Apr  7 14:41:15 alessio kernel: [  334.505008]  [<c1101467>] ? handle_mm_fault+0xb7/0x120
Apr  7 14:41:15 alessio kernel: [  334.505018]  [<c150cb10>] ? do_page_fault+0x0/0x490
Apr  7 14:41:15 alessio kernel: [  334.505025]  [<c150cd3f>] ? do_page_fault+0x22f/0x490
Apr  7 14:41:15 alessio kernel: [  334.505047]  [<f82a5af0>] ? drm_ioctl+0x0/0x470 [drm]
Apr  7 14:41:15 alessio kernel: [  334.505055]  [<c11365eb>] ? do_vfs_ioctl+0x7b/0x2e0
Apr  7 14:41:15 alessio kernel: [  334.505063]  [<c11368d7>] ? sys_ioctl+0x87/0x90
Apr  7 14:41:15 alessio kernel: [  334.505073]  [<c1509904>] ? syscall_call+0x7/0xb
Apr  7 14:41:15 alessio kernel: [  334.505079] ---[ end trace eb66066f17024edb ]---
Apr  7 14:41:15 alessio kernel: [  334.505092] [drm] Disabling audio support
Apr  7 14:41:15 alessio kernel: [  334.506126] HDMI hot plug event: Pin=3 Presence_Detect=0 ELD_Valid=0
Apr  7 14:41:15 alessio kernel: [  334.506357] radeon 0000:02:00.0: GPU softreset
Apr  7 14:41:15 alessio kernel: [  334.506363] radeon 0000:02:00.0:   R_008010_GRBM_STATUS=0xE57024E0
Apr  7 14:41:15 alessio kernel: [  334.506369] radeon 0000:02:00.0:   R_008014_GRBM_STATUS2=0x00110103
Apr  7 14:41:15 alessio kernel: [  334.506376] radeon 0000:02:00.0:   R_000E50_SRBM_STATUS=0x200000C0
Apr  7 14:41:15 alessio kernel: [  334.506387] radeon 0000:02:00.0:   R_008020_GRBM_SOFT_RESET=0x00007FEE
Apr  7 14:41:15 alessio kernel: [  334.521271] radeon 0000:02:00.0: R_008020_GRBM_SOFT_RESET=0x00000001
Apr  7 14:41:15 alessio kernel: [  334.537146] radeon 0000:02:00.0:   R_008010_GRBM_STATUS=0xA0003030
Apr  7 14:41:15 alessio kernel: [  334.537152] radeon 0000:02:00.0:   R_008014_GRBM_STATUS2=0x00000003
Apr  7 14:41:15 alessio kernel: [  334.537158] radeon 0000:02:00.0:   R_000E50_SRBM_STATUS=0x200080C0
Apr  7 14:41:15 alessio kernel: [  334.538156] radeon 0000:02:00.0: GPU reset succeed
Apr  7 14:41:15 alessio kernel: [  334.579793] radeon 0000:02:00.0: WB enabled
Apr  7 14:41:15 alessio kernel: [  334.611097] [drm] ring test succeeded in 1 usecs
Apr  7 14:41:15 alessio kernel: [  334.611111] [drm] ib test succeeded in 1 usecs
Apr  7 14:41:15 alessio kernel: [  334.611116] [drm] Enabling audio support
Apr  7 14:41:15 alessio kernel: [  334.611141] HDMI hot plug event: Pin=3 Presence_Detect=0 ELD_Valid=0
Apr  7 14:41:26 alessio kernel: [  345.608034] radeon 0000:02:00.0: GPU lockup CP stall for more than 10000msec
Apr  7 14:41:26 alessio kernel: [  345.608042] ------------[ cut here ]------------
Apr  7 14:41:26 alessio kernel: [  345.608098] WARNING: at /build/buildd/linux-2.6.38/drivers/gpu/drm/radeon/radeon_fence.c:248 radeon_fence_wait+0x2ea/0x350 [radeon]()
Apr  7 14:41:26 alessio kernel: [  345.608105] Hardware name: HP Compaq dx2450 Microtower PC
Apr  7 14:41:26 alessio kernel: [  345.608110] GPU lockup (waiting for 0x000007F5 last fence id 0x000007F2)
Apr  7 14:41:26 alessio kernel: [  345.608114] Modules linked in: parport_pc ppdev snd_hda_codec_hdmi snd_hda_codec_realtek binfmt_misc vboxnetadp vboxnetflt vboxdrv snd_hda_intel snd_hda_codec snd_hwdep snd_pcm radeon snd_seq_midi snd_rawmidi snd_seq_midi_event ttm snd_seq snd_timer drm_kms_helper snd_seq_device drm psmouse snd serio_raw soundcore k8temp i2c_algo_bit snd_page_alloc i2c_nforce2 lp parport forcedeth sata_nv
Apr  7 14:41:26 alessio kernel: [  345.608168] Pid: 1454, comm: compiz Tainted: G        W   2.6.38-7-generic #39-Ubuntu
Apr  7 14:41:26 alessio kernel: [  345.608174] Call Trace:
Apr  7 14:41:26 alessio kernel: [  345.608189]  [<c104f912>] ? warn_slowpath_common+0x72/0xa0
Apr  7 14:41:26 alessio kernel: [  345.608225]  [<f855b5da>] ? radeon_fence_wait+0x2ea/0x350 [radeon]
Apr  7 14:41:26 alessio kernel: [  345.608259]  [<f855b5da>] ? radeon_fence_wait+0x2ea/0x350 [radeon]
Apr  7 14:41:26 alessio kernel: [  345.608268]  [<c104f9e3>] ? warn_slowpath_fmt+0x33/0x40
Apr  7 14:41:26 alessio kernel: [  345.608303]  [<f855b5da>] ? radeon_fence_wait+0x2ea/0x350 [radeon]
Apr  7 14:41:26 alessio kernel: [  345.608315]  [<c106d290>] ? autoremove_wake_function+0x0/0x50
Apr  7 14:41:26 alessio kernel: [  345.608349]  [<f855be41>] ? radeon_sync_obj_wait+0x11/0x20 [radeon]
Apr  7 14:41:26 alessio kernel: [  345.608366]  [<f8375719>] ? ttm_bo_wait+0xd9/0x170 [ttm]
Apr  7 14:41:26 alessio kernel: [  345.608381]  [<f8377dc2>] ? ttm_bo_move_accel_cleanup+0x162/0x1e0 [ttm]
Apr  7 14:41:26 alessio kernel: [  345.608417]  [<f855c11a>] ? radeon_move_blit.clone.0+0x13a/0x1b0 [radeon]
Apr  7 14:41:26 alessio kernel: [  345.608453]  [<f855c3d5>] ? radeon_move_ram_vram.clone.2+0x105/0x120 [radeon]
Apr  7 14:41:26 alessio kernel: [  345.608468]  [<f83759f2>] ? ttm_bo_list_ref_sub+0x22/0x30 [ttm]
Apr  7 14:41:26 alessio kernel: [  345.608453]  [<f855c3d5>] ? radeon_move_ram_vram.clone.2+0x105/0x120 [radeon]
Apr  7 14:41:26 alessio kernel: [  345.608468]  [<f83759f2>] ? ttm_bo_list_ref_sub+0x22/0x30 [ttm]
Apr  7 14:41:26 alessio kernel: [  345.608507]  [<f855c59a>] ? radeon_bo_move+0x1aa/0x1c0 [radeon]
Apr  7 14:41:26 alessio kernel: [  345.608522]  [<f83761c0>] ? ttm_bo_unmap_virtual_locked+0x50/0x60 [ttm]
Apr  7 14:41:26 alessio kernel: [  345.608557]  [<f855c3f0>] ? radeon_bo_move+0x0/0x1c0 [radeon]
Apr  7 14:41:26 alessio kernel: [  345.608572]  [<f83762fd>] ? ttm_bo_handle_move_mem+0x12d/0x380 [ttm]
Apr  7 14:41:26 alessio kernel: [  345.608609]  [<f855d8a0>] ? radeon_bo_move_notify+0x0/0x30 [radeon]
Apr  7 14:41:26 alessio kernel: [  345.608624]  [<f8377195>] ? ttm_bo_move_buffer+0x125/0x140 [ttm]
Apr  7 14:41:26 alessio kernel: [  345.608638]  [<f83759f2>] ? ttm_bo_list_ref_sub+0x22/0x30 [ttm]
Apr  7 14:41:26 alessio kernel: [  345.608655]  [<f8377258>] ? ttm_bo_validate+0xa8/0x120 [ttm]
Apr  7 14:41:26 alessio kernel: [  345.608691]  [<f855d4a3>] ? radeon_bo_list_validate+0x73/0xd0 [radeon]
Apr  7 14:41:26 alessio kernel: [  345.608733]  [<f8574509>] ? radeon_cs_parser_relocs+0x209/0x250 [radeon]
Apr  7 14:41:26 alessio kernel: [  345.608773]  [<f8574799>] ? radeon_cs_parser_init+0x249/0x2a0 [radeon]
Apr  7 14:41:26 alessio kernel: [  345.608813]  [<f8574915>] ? radeon_cs_ioctl+0x75/0x180 [radeon]
Apr  7 14:41:26 alessio kernel: [  345.608822]  [<c12726eb>] ? idr_pre_get+0x4b/0x80
Apr  7 14:41:26 alessio kernel: [  345.608851]  [<f82a5cd1>] ? drm_ioctl+0x1e1/0x470 [drm]
Apr  7 14:41:26 alessio kernel: [  345.608893]  [<f85748a0>] ? radeon_cs_ioctl+0x0/0x180 [radeon]
Apr  7 14:41:26 alessio kernel: [  345.608905]  [<c11051d0>] ? mmap_region+0x190/0x450
Apr  7 14:41:26 alessio kernel: [  345.608913]  [<c11056c1>] ? do_mmap_pgoff+0x231/0x300
Apr  7 14:41:26 alessio kernel: [  345.608933]  [<f82a5af0>] ? drm_ioctl+0x0/0x470 [drm]
Apr  7 14:41:26 alessio kernel: [  345.608941]  [<c11365eb>] ? do_vfs_ioctl+0x7b/0x2e0
Apr  7 14:41:26 alessio kernel: [  345.608948]  [<c11368d7>] ? sys_ioctl+0x87/0x90
Apr  7 14:41:26 alessio kernel: [  345.608959]  [<c1509904>] ? syscall_call+0x7/0xb
Apr  7 14:41:26 alessio kernel: [  345.608965] ---[ end trace eb66066f17024edc ]---
Apr  7 14:41:26 alessio kernel: [  345.608978] [drm] Disabling audio support
Apr  7 14:41:26 alessio kernel: [  345.610137] radeon 0000:02:00.0: GPU softreset
Apr  7 14:41:26 alessio kernel: [  345.610143] radeon 0000:02:00.0:   R_008010_GRBM_STATUS=0xE57024E0
Apr  7 14:41:26 alessio kernel: [  345.610149] radeon 0000:02:00.0:   R_008014_GRBM_STATUS2=0x00110103
Apr  7 14:41:26 alessio kernel: [  345.610155] radeon 0000:02:00.0:   R_000E50_SRBM_STATUS=0x200000C0
Apr  7 14:41:26 alessio kernel: [  345.610167] radeon 0000:02:00.0:   R_008020_GRBM_SOFT_RESET=0x00007FEE
Apr  7 14:41:26 alessio kernel: [  345.625051] radeon 0000:02:00.0: R_008020_GRBM_SOFT_RESET=0x00000001
Apr  7 14:41:26 alessio kernel: [  345.640926] radeon 0000:02:00.0:   R_008010_GRBM_STATUS=0xA0003030
Apr  7 14:41:26 alessio kernel: [  345.640932] radeon 0000:02:00.0:   R_008014_GRBM_STATUS2=0x00000003
Apr  7 14:41:26 alessio kernel: [  345.640938] radeon 0000:02:00.0:   R_000E50_SRBM_STATUS=0x200080C0
Apr  7 14:41:26 alessio kernel: [  345.641936] radeon 0000:02:00.0: GPU reset succeed
Apr  7 14:41:26 alessio kernel: [  345.641947] HDMI hot plug event: Pin=3 Presence_Detect=0 ELD_Valid=0
Apr  7 14:41:26 alessio kernel: [  345.682449] radeon 0000:02:00.0: WB enabled
Apr  7 14:41:26 alessio kernel: [  345.713431] [drm] ring test succeeded in 1 usecs
Apr  7 14:41:26 alessio kernel: [  345.713445] [drm] ib test succeeded in 1 usecs
Apr  7 14:41:26 alessio kernel: [  345.713450] [drm] Enabling audio support
Apr  7 14:41:26 alessio kernel: [  345.714088] HDMI hot plug event: Pin=3 Presence_Detect=0 ELD_Valid=0
Apr  7 14:42:35 alessio kernel: imklog 4.6.4, log source = /proc/kmsg started.
Apr  7 14:42:35 alessio rsyslogd: [origin software="rsyslogd" swVersion="4.6.4" x-pid="484" x-info="http://www.rsyslog.com"] (re)start
Apr  7 14:42:35 alessio rsyslogd: rsyslogd's groupid changed to 103
Apr  7 14:42:35 alessio rsyslogd: rsyslogd's userid changed to 101
Apr  7 14:42:35 alessio rsyslogd-2039: Could no open output pipe '/dev/xconsole' [try http://www.rsyslog.com/e/2039 ]
Apr  7 14:42:35 alessio kernel: [    0.000000] Initializing cgroup subsys cpuset
Apr  7 14:42:35 alessio kernel: [    0.000000] Initializing cgroup subsys cpu