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[  456.513218] ------------[ cut here ]------------
[  456.513243] WARNING: CPU: 0 PID: 1557 at /build/linux-5xFjum/linux-3.19.0/drivers/gpu/drm/drm_dp_mst_topology.c:1293 process_single_tx_qlock+0x623/0x690 [drm_kms_helper]()
[  456.513246] fail
[  456.513247] Modules linked in: cdc_mbim cdc_wdm snd_usb_audio cdc_ncm snd_usbmidi_lib usbnet mii overlay binfmt_misc rfcomm bnep nls_iso8859_1 hid_microsoft hid_generic hid_sensor_incl_3d hid_sensor_magn_3d hid_sensor_rotation hid_sensor_gyro_3d hid_sensor_accel_3d hid_sensor_trigger industrialio_triggered_buffer kfifo_buf industrialio hid_sensor_iio_common hid_sensor_hub uvcvideo videobuf2_vmalloc videobuf2_memops usbhid videobuf2_core v4l2_common videodev media btusb bluetooth arc4 joydev pn544_mei mei_phy pn544 hci hid_multitouch snd_hda_codec_hdmi nfc snd_hda_codec_realtek hid_rmi snd_hda_codec_generic dell_wmi sparse_keymap dell_laptop dcdbas intel_rapl iosf_mbi x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel kvm dm_multipath scsi_dh crct10dif_pclmul crc32_pclmul ghash_clmulni_intel
[  456.513298]  snd_hda_intel iwlmvm snd_hda_controller aesni_intel snd_hda_codec mac80211 aes_x86_64 snd_hwdep lrw gf128mul glue_helper ablk_helper cryptd snd_pcm snd_seq_midi snd_seq_midi_event i915 serio_raw snd_rawmidi lpc_ich iwlwifi snd_seq snd_seq_device snd_timer cfg80211 drm_kms_helper snd mei_me mei shpchp soundcore drm i2c_algo_bit wmi i2c_hid hid dw_dmac video dw_dmac_core i2c_designware_platform i2c_designware_core snd_soc_sst_acpi spi_pxa2xx_platform soc_button_array dell_rbtn intel_smartconnect mac_hid cuse parport_pc ppdev lp parport autofs4 psmouse ahci libahci
[  456.513345] CPU: 0 PID: 1557 Comm: Xorg Tainted: G        W      3.19.0-28-generic #30-Ubuntu
[  456.513347] Hardware name: Dell Inc. XPS 12-9Q33/XPS 12-9Q33, BIOS A08 03/03/2015
[  456.513349]  ffffffffc0326038 ffff88021367f7f8 ffffffff817c458f 0000000000000007
[  456.513354]  ffff88021367f848 ffff88021367f838 ffffffff81076a6a ffff8802155c44c8
[  456.513358]  ffff8802155c4608 0000000000001000 ffff8802155c4608 000000000000000c
[  456.513363] Call Trace:
[  456.513373]  [<ffffffff817c458f>] dump_stack+0x45/0x57
[  456.513379]  [<ffffffff81076a6a>] warn_slowpath_common+0x8a/0xc0
[  456.513382]  [<ffffffff81076ae6>] warn_slowpath_fmt+0x46/0x50
[  456.513398]  [<ffffffffc03187b3>] process_single_tx_qlock+0x623/0x690 [drm_kms_helper]
[  456.513410]  [<ffffffffc0318862>] process_single_down_tx_qlock+0x42/0x150 [drm_kms_helper]
[  456.513422]  [<ffffffffc03189d8>] drm_dp_queue_down_tx+0x68/0x80 [drm_kms_helper]
[  456.513435]  [<ffffffffc031c826>] drm_dp_mst_i2c_xfer+0x176/0x290 [drm_kms_helper]
[  456.513464]  [<ffffffffc025a785>] ? drm_mode_create+0x25/0x70 [drm]
[  456.513488]  [<ffffffffc025b08d>] ? drm_for_each_detailed_block+0x3d/0x150 [drm]
[  456.513498]  [<ffffffff8162809d>] __i2c_transfer+0x6d/0x220
[  456.513502]  [<ffffffff81629769>] i2c_transfer+0x59/0xc0
[  456.513525]  [<ffffffffc025bd19>] drm_do_probe_ddc_edid+0xc9/0x140 [drm]
[  456.513548]  [<ffffffffc025d40f>] drm_get_edid+0x2f/0x3f0 [drm]
[  456.513562]  [<ffffffffc031a51c>] drm_dp_mst_get_edid+0x8c/0xa0 [drm_kms_helper]
[  456.513603]  [<ffffffffc04e7ef9>] intel_dp_mst_get_modes+0x29/0x50 [i915]
[  456.513616]  [<ffffffffc031692e>] drm_helper_probe_single_connector_modes_merge_bits+0xfe/0x480 [drm_kms_helper]
[  456.513630]  [<ffffffffc0316cc3>] drm_helper_probe_single_connector_modes+0x13/0x20 [drm_kms_helper]
[  456.513655]  [<ffffffffc0257918>] drm_mode_getconnector+0x368/0x3e0 [drm]
[  456.513673]  [<ffffffffc0248a6f>] drm_ioctl+0x1df/0x680 [drm]
[  456.513682]  [<ffffffff812096a0>] do_vfs_ioctl+0x2e0/0x4e0
[  456.513688]  [<ffffffff816a63b5>] ? __sys_recvmsg+0x65/0x80
[  456.513692]  [<ffffffff81209921>] SyS_ioctl+0x81/0xa0
[  456.513696]  [<ffffffff817cb6cd>] system_call_fastpath+0x16/0x1b
[  456.513699] ---[ end trace 06eba29100be1286 ]---

ProblemType: Bug
DistroRelease: Ubuntu 15.04
Package: xserver-xorg-core 2:1.17.1-0ubuntu3
ProcVersionSignature: Ubuntu 3.19.0-28.30-generic 3.19.8-ckt5
Uname: Linux 3.19.0-28-generic x86_64
.tmp.unity.support.test.0:
 
ApportVersion: 2.17.2-0ubuntu1.4
Architecture: amd64
CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
CompositorRunning: compiz
CompositorUnredirectDriverBlacklist: '(nouveau|Intel).*Mesa 8.0'
CompositorUnredirectFSW: true
Date: Tue Sep 15 09:35:29 2015
DistUpgraded: 2015-04-24 15:17:34,960 DEBUG enabling apt cron job
DistroCodename: vivid
DistroVariant: ubuntu
ExecutablePath: /usr/bin/Xorg
ExtraDebuggingInterest: Yes
GraphicsCard:
 Intel Corporation Haswell-ULT Integrated Graphics Controller [8086:0a16] (rev 09) (prog-if 00 [VGA controller])
   Subsystem: Dell Device [1028:05e3]
InstallationDate: Installed on 2013-10-18 (696 days ago)
InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1)
MachineType: Dell Inc. XPS 12-9Q33
ProcEnviron:
 
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.19.0-28-generic.efi.signed root=UUID=8ef07bf4-4d18-497d-8186-e7c58ac6004d ro quiet splash vt.handoff=7
SourcePackage: xorg-server
UpgradeStatus: Upgraded to vivid on 2015-04-24 (143 days ago)
dmi.bios.date: 03/03/2015
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A08
dmi.board.name: XPS 12-9Q33
dmi.board.vendor: Dell Inc.
dmi.board.version: A08
dmi.chassis.type: 8
dmi.chassis.vendor: Dell Inc.
dmi.chassis.version: Not Specified
dmi.modalias: dmi:bvnDellInc.:bvrA08:bd03/03/2015:svnDellInc.:pnXPS12-9Q33:pvrA08:rvnDellInc.:rnXPS12-9Q33:rvrA08:cvnDellInc.:ct8:cvrNotSpecified:
dmi.product.name: XPS 12-9Q33
dmi.product.version: A08
dmi.sys.vendor: Dell Inc.
version.compiz: compiz 1:0.9.12.1+15.04.20150410.1-0ubuntu1
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.64+git1509130630.94ecdc~gd~v
version.libgl1-mesa-dri: libgl1-mesa-dri 11.1~git1509150730.a548c7~gd~v
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 11.1~git1509150730.a548c7~gd~v
version.xserver-xorg-core: xserver-xorg-core 2:1.17.1-0ubuntu3
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.9.0-1ubuntu2
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.5.99+git1508200731.0288a4~gd~v
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917+git1509140731.23986f~gd~v
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.11+git1509140732.1ff13a~gd~v
xserver.bootTime: Tue Sep 15 09:27:43 2015
xserver.configfile: default
xserver.errors:
 
xserver.logfile: /var/log/Xorg.0.log
xserver.outputs:
 product id                                1021 
 vendor                                     LGD
xserver.version: 2:1.17.1-0ubuntu3

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug compiz-0.9 third-party-packages ubuntu vivid
-- 
Display port stopped working with update to kernel 3.19.0.28
https://bugs.launchpad.net/bugs/1495817
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