Comment 18 for bug 1183804

[ 20.095355] ------------[ cut here ]------------
[ 20.095385] WARNING: at /build/buildd/linux-3.8.0/drivers/gpu/drm/i915/intel_display.c:1028 intel_wait_for_pipe_off+0xe2/0x1a0 [i915]()
[ 20.095387] Hardware name:
[ 20.095388] pipe_off wait timed out
[ 20.095390] Modules linked in: snd_hda_codec_hdmi snd_hda_codec_realtek nfsv4(F) parport_pc(F) ppdev(F) bnep rfcomm bluetooth binfmt_misc(F) nfsd(F) auth_rpcgss(F) nfs_acl(F) nfs(F) lockd(F) sunrpc(F) fscache(F) coretemp kvm_intel kvm ghash_clmulni_intel(F) aesni_intel(F) aes_x86_64(F) xts(F) lrw(F) gf128mul(F) ablk_helper(F) cryptd(F) snd_hda_intel snd_hda_codec snd_hwdep(F) snd_pcm(F) snd_page_alloc(F) snd_seq_midi(F) snd_seq_midi_event(F) snd_rawmidi(F) snd_seq(F) i915 snd_seq_device(F) snd_timer(F) video(F) drm_kms_helper gpio_ich snd(F) drm soundcore(F) lpc_ich mac_hid psmouse(F) microcode(F) serio_raw(F) i2c_algo_bit mei lp(F) parport(F) hid_generic usbhid hid firewire_ohci firewire_core ahci(F) libahci(F) crc_itu_t(F) e1000e(F)
[ 20.095440] Pid: 1194, comm: Xorg Tainted: GF 3.8.0-19-generic #29-Ubuntu
[ 20.095442] Call Trace:
[ 20.095455] [<ffffffff810587ef>] warn_slowpath_common+0x7f/0xc0
[ 20.095456] [<ffffffff810588ec>] warn_slowpath_fmt+0x4c/0x50
[ 20.095463] [<ffffffffa01cdd12>] intel_wait_for_pipe_off+0xe2/0x1a0 [i915]
[ 20.095469] [<ffffffffa01cdee6>] intel_disable_pipe+0x116/0x190 [i915]
[ 20.095475] [<ffffffffa01ce68b>] ironlake_crtc_disable+0xdb/0x880 [i915]
[ 20.095483] [<ffffffffa013494c>] ? drm_mode_create+0x4c/0x80 [drm]
[ 20.095489] [<ffffffffa01d634b>] intel_set_mode+0x36b/0xa30 [i915]
[ 20.095496] [<ffffffffa01d7126>] intel_crtc_set_config+0x716/0x950 [i915]
[ 20.095502] [<ffffffffa0136c11>] drm_mode_setcrtc+0x121/0x5a0 [drm]
[ 20.095507] [<ffffffffa0127559>] drm_ioctl+0x4e9/0x5b0 [drm]
[ 20.095513] [<ffffffffa0136af0>] ? drm_mode_setplane+0x370/0x370 [drm]
[ 20.095516] [<ffffffff811a5919>] do_vfs_ioctl+0x99/0x570
[ 20.095517] [<ffffffff811a5e81>] sys_ioctl+0x91/0xb0
[ 20.095521] [<ffffffff816d379d>] system_call_fastpath+0x1a/0x1f
[ 20.095522] ---[ end trace cf98203b2e7bf046 ]---

Looks like I'm getting this same stacktrace, on a PC with fresh 13.04 installed, booted with dual heads.