Comment 8 for bug 1211394

Still got the trace message in dmesg with v3.11-rc5-saucy, while dual screen works on reboot.
Switching screen layout might generate more trace messages, but screen display is fine.

[ 89.480071] ------------[ cut here ]------------
[ 89.480122] WARNING: CPU: 2 PID: 2859 at /home/apw/COD/linux/drivers/gpu/drm/i915/intel_display.c:822 intel_wait_for_pipe_off+0x1bc/0x1d0 [i915]()
[ 89.480126] pipe_off wait timed out
[ 89.480128] Modules linked in: pci_stub vboxpci(OF) vboxnetadp(OF) vboxnetflt(OF) vboxdrv(OF) zram(C) deflate ctr twofish_generic twofish_x86_64_3way twofish_x86_64 twofish_common camellia
_generic camellia_x86_64 serpent_sse2_x86_64 xts serpent_generic lrw gf128mul glue_helper blowfish_generic blowfish_x86_64 blowfish_common cast5_generic cast_common ablk_helper cryptd des_gen
eric cmac xcbc rmd160 crypto_null af_key xfrm_algo dm_crypt arc4 parport_pc ppdev iwldvm usblp bnep mac80211 rfcomm btusb bluetooth i915 iwlwifi joydev snd_hda_codec_hdmi snd_hda_codec_conexa
nt snd_hda_intel snd_hda_codec dm_multipath cfg80211 scsi_dh drm_kms_helper psmouse drm i2c_algo_bit snd_hwdep snd_pcm serio_raw mei_me mei tpm_tis snd_page_alloc video lpc_ich mac_hid intel_
ips wmi nfsd sata_sil24 auth_rpcgss nfs_acl thinkpad_acpi nfs nvram snd_seq_midi snd_seq_midi_event lockd snd_rawmidi snd_seq snd_seq_device sunrpc snd_timer fscache snd binfmt_misc soundcore
 kvm_intel kvm intelfb coretemp lp parport ext2 zfs(POF) zunicode(POF) zavl(POF) zcommon(POF) znvpair(POF) spl(OF) zlib_deflate hid_generic usbhid hid e1000e ahci ptp libahci pps_core microco
de
[ 89.480224] CPU: 2 PID: 2859 Comm: Xorg Tainted: PF WC O 3.11.0-031100rc5-generic #201308112135
[ 89.480225] Hardware name: LENOVO 3680N48/3680N48, BIOS 6QET70WW (1.40 ) 10/11/2012
[ 89.480227] 0000000000000336 ffff8801f6567a18 ffffffff8171f5a0 0000000000000007
[ 89.480229] ffff8801f6567a68 ffff8801f6567a58 ffffffff8106532c ffff8802301c0000
[ 89.480231] ffff88020aa74000 0000000000071008 00000000ffff322f ffff8801f6567fd8
[ 89.480234] Call Trace:
[ 89.480241] [<ffffffff8171f5a0>] dump_stack+0x46/0x58
[ 89.480245] [<ffffffff8106532c>] warn_slowpath_common+0x8c/0xc0
[ 89.480248] [<ffffffff81065416>] warn_slowpath_fmt+0x46/0x50
[ 89.480260] [<ffffffffa075badc>] intel_wait_for_pipe_off+0x1bc/0x1d0 [i915]
[ 89.480271] [<ffffffffa075bb9e>] intel_disable_pipe+0xae/0xb0 [i915]
[ 89.480281] [<ffffffffa075d1f2>] ironlake_crtc_disable+0xd2/0x290 [i915]
[ 89.480292] [<ffffffffa075ff48>] __intel_set_mode+0x168/0x370 [i915]
[ 89.480303] [<ffffffffa0761306>] intel_set_mode+0x16/0x30 [i915]
[ 89.480313] [<ffffffffa07615bd>] intel_crtc_set_config+0x29d/0x310 [i915]
[ 89.480326] [<ffffffffa0538fcc>] drm_mode_set_config_internal+0x5c/0xe0 [drm]
[ 89.480335] [<ffffffffa053bbd8>] drm_mode_setcrtc+0x328/0x560 [drm]
[ 89.480345] [<ffffffffa075b6e9>] ? intel_crtc_load_lut+0xd9/0x190 [i915]
[ 89.480352] [<ffffffffa052b48a>] drm_ioctl+0x50a/0x640 [drm]
[ 89.480360] [<ffffffffa053b8b0>] ? drm_mode_setplane+0x3f0/0x3f0 [drm]
[ 89.480364] [<ffffffff811c429c>] do_vfs_ioctl+0x7c/0x2f0
[ 89.480368] [<ffffffff810210e9>] ? syscall_trace_enter+0x29/0x270
[ 89.480370] [<ffffffff811c45a1>] SyS_ioctl+0x91/0xb0
[ 89.480373] [<ffffffff8173426f>] tracesys+0xe1/0xe6
[ 89.480374] ---[ end trace 6f81e2e3b1ce3f4a ]---
[ 127.841078] Bluetooth: HIDP (Human Interface Emulation) ver 1.2
[ 127.841097] Bluetooth: HIDP socket layer initialized
[ 337.310514] ------------[ cut here ]------------
[ 337.310561] WARNING: CPU: 0 PID: 2859 at /home/apw/COD/linux/drivers/gpu/drm/i915/intel_display.c:822 intel_wait_for_pipe_off+0x1bc/0x1d0 [i915]()
[ 337.310563] pipe_off wait timed out
[ 337.310565] Modules linked in: hidp pci_stub vboxpci(OF) vboxnetadp(OF) vboxnetflt(OF) vboxdrv(OF) zram(C) deflate ctr twofish_generic twofish_x86_64_3way twofish_x86_64 twofish_common cam
ellia_generic camellia_x86_64 serpent_sse2_x86_64 xts serpent_generic lrw gf128mul glue_helper blowfish_generic blowfish_x86_64 blowfish_common cast5_generic cast_common ablk_helper cryptd de
s_generic cmac xcbc rmd160 crypto_null af_key xfrm_algo dm_crypt arc4 parport_pc ppdev iwldvm usblp bnep mac80211 rfcomm btusb bluetooth i915 iwlwifi joydev snd_hda_codec_hdmi snd_hda_codec_c
onexant snd_hda_intel snd_hda_codec dm_multipath cfg80211 scsi_dh drm_kms_helper psmouse drm i2c_algo_bit snd_hwdep snd_pcm serio_raw mei_me mei tpm_tis snd_page_alloc video lpc_ich mac_hid intel_ips wmi nfsd sata_sil24 auth_rpcgss nfs_acl thinkpad_acpi nfs nvram snd_seq_midi snd_seq_midi_event lockd snd_rawmidi snd_seq snd_seq_device sunrpc snd_timer fscache snd binfmt_misc soundcore kvm_intel kvm intelfb coretemp lp parport ext2 zfs(POF) zunicode(POF) zavl(POF) zcommon(POF) znvpair(POF) spl(OF) zlib_deflate hid_generic usbhid hid e1000e ahci ptp libahci pps_core microcode
[ 337.310670] CPU: 0 PID: 2859 Comm: Xorg Tainted: PF WC O 3.11.0-031100rc5-generic #201308112135
[ 337.310673] Hardware name: LENOVO 3680N48/3680N48, BIOS 6QET70WW (1.40 ) 10/11/2012
[ 337.310675] 0000000000000336 ffff8801f6567b58 ffffffff8171f5a0 0000000000000007
[ 337.310680] ffff8801f6567ba8 ffff8801f6567b98 ffffffff8106532c ffff8802301c0000
[ 337.310684] ffff88020aa74000 0000000000071008 000000010000240f ffff8801f6567fd8
[ 337.310688] Call Trace:
[ 337.310697] [<ffffffff8171f5a0>] dump_stack+0x46/0x58
[ 337.310704] [<ffffffff8106532c>] warn_slowpath_common+0x8c/0xc0
[ 337.310708] [<ffffffff81065416>] warn_slowpath_fmt+0x46/0x50
[ 337.310732] [<ffffffffa075badc>] intel_wait_for_pipe_off+0x1bc/0x1d0 [i915]
[ 337.310753] [<ffffffffa075bb9e>] intel_disable_pipe+0xae/0xb0 [i915]
[ 337.310774] [<ffffffffa075d1f2>] ironlake_crtc_disable+0xd2/0x290 [i915]
[ 337.310795] [<ffffffffa075f566>] intel_crtc_update_dpms+0x76/0xb0 [i915]
[ 337.310801] [<ffffffff811c5150>] ? __pollwait+0xf0/0xf0
[ 337.310821] [<ffffffffa075f64a>] intel_encoder_dpms+0x1a/0x30 [i915]
[ 337.310842] [<ffffffffa07612bc>] intel_connector_dpms+0x3c/0x70 [i915]
[ 337.310863] [<ffffffffa0536f34>] drm_mode_connector_set_obj_prop+0xb4/0xc0 [drm]
[ 337.310878] [<ffffffffa053cc62>] drm_mode_obj_set_property_ioctl+0x122/0x210 [drm]
[ 337.310895] [<ffffffffa053cd80>] drm_mode_connector_property_set_ioctl+0x30/0x40 [drm]
[ 337.310907] [<ffffffffa052b48a>] drm_ioctl+0x50a/0x640 [drm]
[ 337.310923] [<ffffffffa053cd50>] ? drm_mode_obj_set_property_ioctl+0x210/0x210 [drm]
[ 337.310931] [<ffffffff8110bbdc>] ? acct_account_cputime+0x1c/0x20
[ 337.310938] [<ffffffff8109cad6>] ? account_user_time+0xa6/0xc0
[ 337.310942] [<ffffffff811c429c>] do_vfs_ioctl+0x7c/0x2f0
[ 337.310948] [<ffffffff810210e9>] ? syscall_trace_enter+0x29/0x270
[ 337.310952] [<ffffffff811c45a1>] SyS_ioctl+0x91/0xb0
[ 337.310957] [<ffffffff8173426f>] tracesys+0xe1/0xe6
[ 337.310960] ---[ end trace 6f81e2e3b1ce3f4b ]---