The 3.12.0-031200rc3-generic still has this problem, but I find I only get this when booting with a triple monitor setup.

[   28.320987] ------------[ cut here ]------------
[   28.321050] WARNING: CPU: 0 PID: 1816 at /home/apw/COD/linux/drivers/gpu/drm/i915/intel_display.c:844 intel_wait_for_pipe_off+0x1e1/0x1f0 [i915]()
[   28.321054] pipe_off wait timed out
[   28.321056] Modules linked in: dm_crypt vmnet(OF) parport_pc vmw_vsock_vmci_transport vsock vmw_vmci vmmon(OF) pci_stub vboxpci(OF) vboxnetadp(OF) vboxnetflt(OF) vboxdrv(OF) ip6table_filter ip6_tables iptable_filter ip_tables ebtable_nat ebtables x_tables zram(C) deflate ctr twofish_generic twofish_avx_x86_64 twofish_x86_64_3way twofish_x86_64 twofish_common camellia_generic camellia_aesni_avx_x86_64 camellia_x86_64 serpent_avx_x86_64 serpent_sse2_x86_64 xts serpent_generic lrw gf128mul glue_helper blowfish_generic blowfish_x86_64 blowfish_common cast5_avx_x86_64 cast5_generic cast_common ablk_helper cryptd des_generic cmac xcbc rmd160 crypto_null af_key xfrm_algo snd_hda_codec_hdmi snd_hda_codec_realtek joydev usb_storage hid_generic usbhid hid qmi_wwan cdc_wdm qcserial usb_wwan usbserial usbnet mii btusb snd_hda_intel snd_hda_codec snd_hwdep snd_pcm uvcvideo videobuf2_vmalloc tpm_infineon videobuf2_memops snd_page_alloc videobuf2_core snd_seq_midi videodev snd_seq_midi_event snd_rawmidi snd_seq snd_seq_device snd_timer bnep rfcomm arc4 ppdev snd bluetooth iwldvm mac80211 psmouse serio_raw i915 iwlwifi rtsx_pci_ms tpm_tis memstick cfg80211 lpc_ich fujitsu_laptop drm_kms_helper soundcore mei_me binfmt_misc mei video drm i2c_algo_bit mac_hid nls_iso8859_1 coretemp lp parport rtsx_pci_sdmmc e1000e rtsx_pci ahci ptp libahci pps_core [last unloaded: parport_pc]
[   28.321192] CPU: 0 PID: 1816 Comm: Xorg Tainted: GF       WC O 3.12.0-031200rc3-generic #201309291835
[   28.321196] Hardware name: FUJITSU LIFEBOOK U772/FJNB247, BIOS Version 1.08 12/14/2012
[   28.321199]  000000000000034c ffff8800cfb7fa18 ffffffff81747b27 0000000000000007
[   28.321207]  ffff8800cfb7fa68 ffff8800cfb7fa58 ffffffff8106759c ffffffff81eb1040
[   28.321213]  ffff880116c78000 0000000000070008 00000000fffef69f ffff8800cfb7ffd8
[   28.321219] Call Trace:
[   28.321233]  [<ffffffff81747b27>] dump_stack+0x46/0x58
[   28.321243]  [<ffffffff8106759c>] warn_slowpath_common+0x8c/0xc0
[   28.321249]  [<ffffffff81067686>] warn_slowpath_fmt+0x46/0x50
[   28.321287]  [<ffffffffa02341d1>] intel_wait_for_pipe_off+0x1e1/0x1f0 [i915]
[   28.321318]  [<ffffffffa0234293>] intel_disable_pipe+0xb3/0xc0 [i915]
[   28.321346]  [<ffffffffa0236c02>] ironlake_crtc_disable+0xd2/0x2a0 [i915]
[   28.321375]  [<ffffffffa02399b8>] __intel_set_mode+0x168/0x370 [i915]
[   28.321405]  [<ffffffffa023b816>] intel_set_mode+0x16/0x30 [i915]
[   28.321434]  [<ffffffffa023bacd>] intel_crtc_set_config+0x29d/0x310 [i915]
[   28.321467]  [<ffffffffa00b65dc>] drm_mode_set_config_internal+0x5c/0xe0 [drm]
[   28.321493]  [<ffffffffa00b92b8>] drm_mode_setcrtc+0x328/0x560 [drm]
[   28.321521]  [<ffffffffa02344ae>] ? intel_crtc_load_lut+0xde/0x180 [i915]
[   28.321548]  [<ffffffffa00a8f1a>] drm_ioctl+0x4fa/0x620 [drm]
[   28.321576]  [<ffffffffa00b8f90>] ? drm_mode_setplane+0x3f0/0x3f0 [drm]
[   28.321583]  [<ffffffff811cf5da>] do_vfs_ioctl+0x7a/0x2e0
[   28.321592]  [<ffffffff81022695>] ? syscall_trace_enter+0x165/0x280
[   28.321597]  [<ffffffff811cf8d1>] SyS_ioctl+0x91/0xb0
[   28.321604]  [<ffffffff8175e4bf>] tracesys+0xe1/0xe6
[   28.321607] ---[ end trace b4078958b6d0e2fe ]---