[Fujitsu LIFEBOOK U772] WARNING: at /build/buildd/linux-3.8.0/drivers/gpu/drm/i915/intel_display.c:1028 intel_wait_for_pipe_off+0xe2/0x1a0 [i915]()

This change was made by a bot.

Would it be possible for you to test the latest upstream kernel? Refer to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest v3.10 kernel[0].

If this bug is fixed in the mainline kernel, please add the following tag 'kernel-fixed-upstream'.

If the mainline kernel does not fix this bug, please add the tag: 'kernel-bug-exists-upstream'.

If you are unable to test the mainline kernel, for example it will not boot, please add the tag: 'kernel-unable-to-test-upstream'.
Once testing of the upstream kernel is complete, please mark this bug as "Confirmed".

Thanks in advance.

[0] http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.10-rc3-saucy/

It was still in 3.9 when i tested that kernel but it seems to be fixed in 3.10 rc3

Is see this error comes only when I boot up with 2 external displays. With only one I dont get the error. So it's releated with dual display.

so in 3.10 latets ppa it's is still in there:

3.10.0-031000-generic #201306301935 SMP Sun Jun 30 23:36:16 UTC 2013 x86_64 x86_64 x86_64 GNU/Linux

[ 46.737042] ------------[ cut here ]------------
[ 46.737098] WARNING: at /home/apw/COD/linux/drivers/gpu/drm/i915/intel_display.c:979 intel_wait_for_pipe_off+0x1bc/0x1d0 [i915]()
[ 46.737101] pipe_off wait timed out
[ 46.737102] Modules linked in: dm_crypt pci_stub vboxpci(OF) vboxnetadp(OF) vboxnetflt(OF) vboxdrv(OF) ip6table_filter ip6_tables iptable_filter ip_tables ebtable_nat ebtables x_tables vsock zram(C) deflate zlib_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 blowfish_generic blowfish_x86_64 blowfish_common cast5_avx_x86_64 cast5_generic cast_common des_generic cmac xcbc rmd160 crypto_null af_key xfrm_algo snd_hda_codec_hdmi snd_hda_codec_realtek joydev intel_powerclamp kvm_intel kvm qcserial usb_wwan usbserial qmi_wwan cdc_wdm crc32_pclmul usbnet ghash_clmulni_intel aesni_intel aes_x86_64 lrw gf128mul glue_helper ablk_helper cryptd snd_hda_intel snd_hda_codec btusb snd_hwdep snd_pcm uvcvideo hid_generic usb_storage snd_page_alloc videobuf2_vmalloc videobuf2_memops videobuf2_core usbhid hid snd_seq_midi videodev snd_seq_midi_event snd_rawmidi tpm_infineon snd_seq arc4 iwldvm snd_seq_device snd_timer mac80211 microcode lpc_ich psmouse iwlwifi rtsx_pci_ms serio_raw memstick snd cfg80211 soundcore i915 tpm_tis drm_kms_helper drm video i2c_algo_bit bnep parport_pc rfcomm ppdev mac_hid bluetooth fujitsu_laptop coretemp lp parport binfmt_misc nls_iso8859_1 rtsx_pci_sdmmc ahci libahci rtsx_pci e1000e ptp pps_core
[ 46.737182] CPU: 2 PID: 1800 Comm: Xorg Tainted: GF WC O 3.10.0-031000-generic #201306301935
[ 46.737184] Hardware name: FUJITSU LIFEBOOK U772/FJNB247, BIOS Version 1.07 08/21/2012
[ 46.737186] ffffffffa01f6818 ffff8801091839d8 ffffffff81703460 ffff880109183a18
[ 46.737190] ffffffff81059100 ffff880117cc4000 ffff8801177a4000 0000000000070008
[ 46.737193] 00000000ffff08af ffff880109183fd8 0000000000000000 ffff880109183a78
[ 46.737197] Call Trace:
[ 46.737207] [<ffffffff81703460>] dump_stack+0x19/0x1b
[ 46.737213] [<ffffffff81059100>] warn_slowpath_common+0x70/0xa0
[ 46.737217] [<ffffffff810591e6>] warn_slowpath_fmt+0x46/0x50
[ 46.737240] [<ffffffffa01b347c>] intel_wait_for_pipe_off+0x1bc/0x1d0 [i915]
[ 46.737259] [<ffffffffa01b359e>] intel_disable_pipe+0x10e/0x150 [i915]
[ 46.737278] [<ffffffffa01b3eed>] ironlake_crtc_disable+0xbd/0x260 [i915]
[ 46.737297] [<ffffffffa01b4ba5>] __intel_set_mode+0x195/0x390 [i915]
[ 46.737302] [<ffffffff8135a774>] ? snprintf+0x34/0x40
[ 46.737322] [<ffffffffa01b9826>] intel_set_mode+0x16/0x30 [i915]
[ 46.737342] [<ffffffffa01b9aa5>] intel_crtc_set_config+0x265/0x330 [i915]
[ 46.737362] [<ffffffffa0124e1e>] drm_mode_set_config_internal+0x2e/0x60 [drm]
[ 46.737380] [<ffffffffa0127ad8>...

3.10.2-031002-generic, ThinkPad X201 + External Display on Display Port
Internal Display always work, external display works intermittently (mostly on lower resolution)

[ 1144.273801] ------------[ cut here ]------------
[ 1144.273850] WARNING: at /home/apw/COD/linux/drivers/gpu/drm/i915/intel_display.c:979 intel_wait_for_pipe_off+0x1bc/0x1d0 [i915]()
[ 1144.273853] pipe_off wait timed out
[ 1144.273855] 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 camellia_generic camellia_x86_64 serpent_sse2_x86_64 xts serpent_generic blowfish_generic blowfish_x86_64 blowfish_common cast5_generic cast_common des_generic cmac xcbc rmd160 crypto_null af_key xfrm_algo dm_crypt parport_pc ppdev rfcomm bnep nfsd usblp auth_rpcgss nfs_acl nfs lockd sunrpc binfmt_misc fscache arc4 iwldvm btusb mac80211 bluetooth joydev dm_multipath scsi_dh iwlwifi i915 snd_hda_codec_hdmi cfg80211 intel_powerclamp drm_kms_helper snd_hda_codec_conexant snd_hda_intel drm snd_hda_codec crc32_pclmul ghash_clmulni_intel psmouse aesni_intel mei_me aes_x86_64 lrw snd_hwdep mei gf128mul snd_pcm glue_helper serio_raw ablk_helper cryptd mac_hid i2c_algo_bit snd_page_alloc lpc_ich tpm_tis intel_ips wmi video sata_sil24 thinkpad_acpi nvram snd_seq_midi snd_seq_midi_event snd_rawmidi snd_seq snd_seq_device snd_timer snd soundcore i2c_intel_mid 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 ahci libahci e1000e ptp pps_core microcode
[ 1144.273966] CPU: 0 PID: 3390 Comm: Xorg Tainted: PF WC O 3.10.2-031002-generic #201307212216
[ 1144.273969] Hardware name: LENOVO 3680N48/3680N48, BIOS 6QET70WW (1.40 ) 10/11/2012
[ 1144.273972] ffffffffa067f818 ffff8801f85a39d8 ffffffff8170d37b ffff8801f85a3a18
[ 1144.273976] ffffffff81059350 ffff8802301c4000 ffff88020e0bc000 0000000000071008
[ 1144.273980] 000000010003372f ffff8801f85a3fd8 0000000000000001 ffff8801f85a3a78
[ 1144.273984] Call Trace:
[ 1144.273997] [<ffffffff8170d37b>] dump_stack+0x19/0x1b
[ 1144.274004] [<ffffffff81059350>] warn_slowpath_common+0x70/0xa0
[ 1144.274007] [<ffffffff81059436>] warn_slowpath_fmt+0x46/0x50
[ 1144.274030] [<ffffffffa063c47c>] intel_wait_for_pipe_off+0x1bc/0x1d0 [i915]
[ 1144.274052] [<ffffffffa063c59e>] intel_disable_pipe+0x10e/0x150 [i915]
[ 1144.274073] [<ffffffffa063ceed>] ironlake_crtc_disable+0xbd/0x260 [i915]
[ 1144.274094] [<ffffffffa063dba5>] __intel_set_mode+0x195/0x390 [i915]
[ 1144.274101] [<ffffffff8135c3d4>] ? snprintf+0x34/0x40
[ 1144.274123] [<ffffffffa0642826>] intel_set_mode+0x16/0x30 [i915]
[ 1144.274144] [<ffffffffa0642aa5>] intel_crtc_set_config+0x265/0x330 [i915]
[ 1144.274165] [<ffffffffa0504e1e>] drm_mode_set_config_internal+0x2e/0x60 [drm]
[ 1144.274181] [<ffffffffa0507ad8>] drm_mode_setcrtc+0x2e8/0x540 [drm]
[ 1144.274201] [<ffffffffa063339f>] ? intel_crtc_load_lut+0x8f/0xb0 [i915]
[ 1144.274215] [<ffffffffa04f756a>] drm_ioctl+0x50a/0x650 [drm]
[ 1144.274231] [<ffffffffa05077f0>] ? drm_mode_setplane+0x3e0/0x3e0 [drm]
[ 1144.274236] [<fffffff...

Dennis Kruyt, as per http://support.ts.fujitsu.com/Download/ShowFiles.asp an update is available for your BIOS (2.07). If you update to this, does it change anything?

If not, could you please both specify what happened, and provide the output of the following terminal command:
sudo dmidecode -s bios-version && sudo dmidecode -s bios-release-date

Thank you for your understanding.

Version 2.0.7 is for a different series, there are 2 U772, I got the first one. But there was also a BIOS update available for series 1, 1.08 So I updated from 1.07 to 1.08

 sudo dmidecode -s bios-version && sudo dmidecode -s bios-release-date:

Version 1.08
12/14/2012

[ 6.989171] ------------[ cut here ]------------
[ 6.989200] WARNING: at /home/apw/COD/linux/drivers/gpu/drm/i915/intel_display.c:966 intel_wait_for_pipe_off+0x1aa/0x1c0 [i915]()
[ 6.989202] Hardware name: LIFEBOOK U772
[ 6.989202] pipe_off wait timed out
[ 6.989203] Modules linked in: ip6table_filter ip6_tables iptable_filter ip_tables ebtable_nat ebtables x_tables vsock zram(C) snd_hda_codec_hdmi snd_hda_codec_realtek joydev deflate zlib_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 serpent_generic glue_helper blowfish_generic blowfish_x86_64 blowfish_common cast5_avx_x86_64 cast5_generic cast_common intel_powerclamp kvm_intel des_generic kvm xcbc crc32_pclmul ghash_clmulni_intel rmd160 aesni_intel aes_x86_64 xts lrw gf128mul ablk_helper cryptd crypto_null af_key xfrm_algo hid_generic tpm_infineon usbhid hid qmi_wwan cdc_wdm btusb usbnet qcserial usb_wwan usbserial snd_hda_intel snd_hda_codec snd_hwdep snd_pcm snd_page_alloc snd_seq_midi snd_seq_midi_event snd_rawmidi arc4 iwldvm uvcvideo snd_seq videobuf2_vmalloc videobuf2_memops mac80211 videobuf2_core videodev microcode iwlwifi snd_seq_device snd_timer tpm_tis cfg80211 snd soundcore psmouse i915 serio_raw mac_hid bnep parport_pc rtsx_pci_ms video ppdev fujitsu_laptop memstick drm_kms_helper rfcomm lpc_ich bluetooth drm mei i2c_algo_bit coretemp lp parport binfmt_misc nls_iso8859_1 usb_storage rtsx_pci_sdmmc e1000e ptp ahci pps_core rtsx_pci libahci
[ 6.989249] Pid: 1830, comm: Xorg Tainted: G C 3.9.11-030911-generic #201307202035
[ 6.989250] Call Trace:
[ 6.989257] [<ffffffff8105a76f>] warn_slowpath_common+0x7f/0xc0
[ 6.989259] [<ffffffff8105a866>] warn_slowpath_fmt+0x46/0x50
[ 6.989270] [<ffffffffa01ccc3a>] intel_wait_for_pipe_off+0x1aa/0x1c0 [i915]
[ 6.989280] [<ffffffffa01cccee>] intel_disable_pipe+0x9e/0xa0 [i915]
[ 6.989289] [<ffffffffa01cd5ad>] ironlake_crtc_disable+0xbd/0x260 [i915]
[ 6.989298] [<ffffffffa01ce280>] __intel_set_mode+0x1a0/0x390 [i915]
[ 6.989301] [<ffffffff811367aa>] ? generic_perform_write+0x16a/0x210
[ 6.989310] [<ffffffffa01d2786>] intel_set_mode+0x16/0x30 [i915]
[ 6.989312] [<ffffffff81136357>] ? unlock_page+0x27/0x30
[ 6.989321] [<ffffffffa01d2c02>] intel_crtc_restore_mode+0x22/0x30 [i915]
[ 6.989330] [<ffffffffa01db757>] intel_dp_set_property+0xa7/0x1e0 [i915]
[ 6.989342] [<ffffffffa00c10a4>] drm_mode_connector_set_obj_prop+0x44/0xc0 [drm]
[ 6.989353] [<ffffffffa00c7312>] drm_mode_obj_set_property_ioctl+0x122/0x210 [drm]
[ 6.989362] [<ffffffffa00c7430>] drm_mode_connector_property_set_ioctl+0x30/0x40 [drm]
[ 6.989370] [<ffffffffa00b556c>] drm_ioctl+0x47c/0x540 [drm]
[ 6.989378] [<ffffffffa00c7400>] ? drm_mode_obj_set_property_ioctl+0x210/0x210 [drm]
[ ...

Dennis Kruyt, thank you for updating your BIOS. Could you please test the newest mainline kernel available via http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.11-rc3-saucy/ ?

I'm having this issue on both precise and raring on ThinkPad X201.
This issue only appears when external display attached to DisplayPort.

The behavior is consistent with stock/mainline kernel with stock or intel linuxgraphics drivers (3.8.0-26-generic, 3.8.0-27-generic, 3.8.0-27-generic with intel linux-graphics 2013Q2, 3.10.0-997-generic,3.10.0-997-generic with intel linux-graphics 2013Q2).

External display works perfectly on VGA port.

Is this duplicate with Bug #1182386?
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1182386

Conrad Yang, if you have a bug in Ubuntu, the Ubuntu Kernel team, Ubuntu Bug Control team, and Ubuntu Bug Squad would like you to please file a new report by executing the following in a terminal:
ubuntu-bug linux

For more on this, please see the Ubuntu Kernel team article:
https://wiki.ubuntu.com/KernelTeam/KernelTeamBugPolicies#Filing_Kernel_Bug_reports

the Ubuntu Bug Control team and Ubuntu Bug Squad team article:
https://wiki.ubuntu.com/Bugs/BestPractices#X.2BAC8-Reporting.Focus_on_One_Issue

and Ubuntu Community article:
https://help.ubuntu.com/community/ReportingBugs#Bug_reporting_etiquette

When opening up the new report, please feel free to subscribe me to it.

Please note, not filing a new report would delay your problem being addressed as quickly as possible.

Thank you for your understanding.

The mainline kernel wont start correctly (blank screen) from 3.10 and upwards with a dual monitor setup. Single monitor boots ok but then this issue I only have with a dual setup. So cant test with new mainline kernel.

Dennis Kruyt, could you please confirm this issue exists with the latest development release of Ubuntu? ISO images are available from http://cdimage.ubuntu.com/daily-live/current/ . If the issue remains, could you please run the following command in the development release from a Terminal (Applications->Accessories->Terminal), as it will automatically gather and attach updated debug information to this report:

apport-collect -p linux <replace-with-bug-number>

This 'wait_for_pipe_off' issue seems pretty widespread. It may well be a dupe of #1182386 , and there is a Fedora report at https://bugzilla.redhat.com/show_bug.cgi?id=919120 . I have been seeing it a couple of times per boot on Fedora 18 from kernel 3.8.9 all the way to kernel 3.10, on a Sony Vaio VPC-Z11.

Adam Williamson, would you mind filing a new report so your hardware may be tracked via:
ubuntu-bug linux

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...

Dennis Kruyt, did this problem not occur in a release prior to Raring?

[ 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.

seeing this issue on Ubuntu 14.04 amd64,
currently running linux-image-3.15.0-2-generic from May 26th.

I've also seen this running stock 3.13.x from trusty.

Will try linux-image-3.15.0-5-generic_3.15.0-5.10_amd64.deb (current utopic kernel) next.

Cheers,
Raoul

Raoul Bhatia, thank you for your comment. So your hardware and problem may be tracked, could you please file a new report with Ubuntu by executing the following in a terminal while booted into a Ubuntu repository kernel (not a mainline one) via:
ubuntu-bug linux

For more on this, please read the official Ubuntu documentation:
Ubuntu Bug Control and Ubuntu Bug Squad: https://wiki.ubuntu.com/Bugs/BestPractices#X.2BAC8-Reporting.Focus_on_One_Issue
Ubuntu Kernel Team: https://wiki.ubuntu.com/KernelTeam/KernelTeamBugPolicies#Filing_Kernel_Bug_reports
Ubuntu Community: https://help.ubuntu.com/community/ReportingBugs#Bug_reporting_etiquette

When opening up the new report, please feel free to subscribe me to it.

Thank you for your understanding.

Helpful bug reporting tips:
https://wiki.ubuntu.com/ReportingBugs