Comment 15 for bug 728923

It almost always happens for me during start up when the purple background with the Ubuntu logo and the dots underneath it. I can get into a virtual terminal by pressing CTRL-ALT-F1. I have it set to automatically login as a user.

If I log in with Ubuntu Classic it seems to fix this.

[ 39.930073] radeon 0000:01:05.0: GPU lockup CP stall for more than 10000msec
[ 39.930077] ------------[ cut here ]------------
[ 39.930095] WARNING: at /build/buildd/linux-2.6.38/drivers/gpu/drm/radeon/radeon_fence.c:248 radeon_fence_wait+0x36f/0x3e0 [radeon]()
[ 39.930097] Hardware name: GA-880GMA-UD2H
[ 39.930099] GPU lockup (waiting for 0x000000B4 last fence id 0x000000B1)
[ 39.930100] Modules linked in: binfmt_misc vboxnetadp vboxnetflt vboxdrv parport_pc ppdev usbhid hid snd_hda_codec_hdmi snd_hda_codec_realtek snd_hda_intel snd_hda_codec snd_hwdep snd_seq_midi snd_pcm snd_rawmidi radeon snd_seq_midi_event snd_seq snd_timer snd_seq_device snd edac_core edac_mce_amd ttm drm_kms_helper drm k10temp soundcore snd_page_alloc i2c_algo_bit xhci_hcd sp5100_tco i2c_piix4 shpchp lp parport ahci floppy libahci firewire_ohci firewire_core crc_itu_t pata_atiixp pata_jmicron r8169
[ 39.930122] Pid: 1026, comm: Xorg Not tainted 2.6.38-8-generic #42-Ubuntu
[ 39.930123] Call Trace:
[ 39.930129] [<ffffffff81065cef>] ? warn_slowpath_common+0x7f/0xc0
[ 39.930131] [<ffffffff81065de6>] ? warn_slowpath_fmt+0x46/0x50
[ 39.930141] [<ffffffffa01766df>] ? radeon_fence_wait+0x36f/0x3e0 [radeon]
[ 39.930145] [<ffffffff81087f30>] ? autoremove_wake_function+0x0/0x40
[ 39.930154] [<ffffffffa0176fc1>] ? radeon_sync_obj_wait+0x11/0x20 [radeon]
[ 39.930160] [<ffffffffa00fab0d>] ? ttm_bo_wait+0xfd/0x1b0 [ttm]
[ 39.930164] [<ffffffffa00fae88>] ? ttm_bo_list_ref_sub+0x28/0x30 [ttm]
[ 39.930175] [<ffffffffa018f9e3>] ? radeon_gem_wait_idle_ioctl+0x93/0x110 [radeon]
[ 39.930184] [<ffffffffa00c2384>] ? drm_ioctl+0x3e4/0x4c0 [drm]
[ 39.930195] [<ffffffffa018f950>] ? radeon_gem_wait_idle_ioctl+0x0/0x110 [radeon]
[ 39.930198] [<ffffffff8100b7b1>] ? handle_signal+0x131/0x260
[ 39.930200] [<ffffffff810156d1>] ? fpu_finit+0x21/0x40
[ 39.930202] [<ffffffff810157fa>] ? init_fpu+0x4a/0x150
[ 39.930205] [<ffffffff8117648f>] ? do_vfs_ioctl+0x8f/0x360
[ 39.930207] [<ffffffff8100bd06>] ? sys_rt_sigreturn+0x106/0x140
[ 39.930209] [<ffffffff811767f1>] ? sys_ioctl+0x91/0xa0
[ 39.930211] [<ffffffff8100c002>] ? system_call_fastpath+0x16/0x1b
[ 39.930213] ---[ end trace ec6fb88f63359be6 ]---