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Since upgrading to latest kernel (4.2.0-11-generic) multi screen setup
no longer works. It does seem intermittant, but in 9/10 cases it will
not drive triple monitor setup, however with some unplugging and
replugging of the DP one screen "may" appear which mirrors the local
display, I can then add the other monitors.

If the laptop screen blanking kicks in it never recovers.

The syslog for the incident is as follows:

Sep 26 11:41:57 hostname kernel: [   14.739685] [drm:intel_pipe_config_compare [i915]] *ERROR* mismatch in ips_enabled (expected 1, found 0)
Sep 26 11:41:57 hostname kernel: [   14.739690] ------------[ cut here ]------------
Sep 26 11:41:57 hostname kernel: [   14.739709] WARNING: CPU: 3 PID: 1620 at /build/linux-1dujk3/linux-4.2.0/drivers/gpu/drm/i915/intel_display.c:12326 check_crtc_state+0x2c5/0x440 [i915]()
Sep 26 11:41:57 hostname kernel: [   14.739711] pipe state doesn't match!
Sep 26 11:41:57 hostname kernel: [   14.739712] Modules linked in: ebtable_filter ebtables ip6table_filter ip6_tables pci_stub vboxpci(OE) vboxnetadp(OE) vboxnetflt(OE) vboxdrv(OE) xt_CHECKSUM iptable_mangle ipt_MASQUERADE nf_nat_masquerade_ipv4 iptable_nat nf_conntrack_ipv4 nf_defrag_ipv4 nf_nat_ipv4 nf_nat nf_conntrack xt_tcpudp bridge stp llc iptable_filter ip_tables x_tables binfmt_misc bnep arc4 btusb btrtl btbcm joydev btintel bluetooth hid_rmi uvcvideo dell_wmi videobuf2_vmalloc sparse_keymap videobuf2_memops videobuf2_core v4l2_common videodev hid_multitouch media dell_laptop dcdbas dell_smm_hwmon snd_soc_rt5640 iwlmvm snd_soc_rl6231 snd_soc_core mac80211 snd_compress ac97_bus snd_pcm_dmaengine snd_seq_midi snd_seq_midi_event intel_rapl snd_hda_codec_hdmi iosf_mbi x86_pkg_temp_thermal intel_powerclamp snd_hda_codec_realtek coretemp snd_hda_codec_generic snd_rawmidi iwlwifi input_leds serio_raw snd_hda_intel cfg80211 snd_hda_codec snd_hda_core snd_hwdep snd_seq snd_pcm snd_seq_device mei_me shpchp mei snd_timer lpc_ich snd soundcore wmi acpi_als kfifo_buf industrialio i2c_designware_platform i2c_designware_core snd_soc_sst_acpi dw_dmac spi_pxa2xx_platform 8250_dw dw_dmac_core intel_smartconnect dell_rbtn mac_hid kvm_intel kvm parport_pc ppdev sunrpc lp parport autofs4 jitterentropy_rng drbg ansi_cprng algif_skcipher af_alg dm_crypt hid_logitech_hidpp hid_logitech_dj usbhid i915 crct10dif_pclmul crc32_pclmul ghash_clmulni_intel i2c_algo_bit aesni_intel drm_kms_helper aes_x86_64 lrw gf128mul glue_helper ablk_helper cryptd drm psmouse ahci libahci sdhci_acpi video sdhci i2c_hid hid
Sep 26 11:41:57 hostname kernel: [   14.739805] CPU: 3 PID: 1620 Comm: Xorg Tainted: G        W  OE   4.2.0-11-generic #13-Ubuntu
Sep 26 11:41:57 hostname kernel: [   14.739807] Hardware name: Dell Inc. XPS13 9333/0GFTRT, BIOS A02 12/11/2013
Sep 26 11:41:57 hostname kernel: [   14.739809]  ffffffffc02a0ab0 ffff880213eaf7e8 ffffffff817b0cc5 0000000000000000
Sep 26 11:41:57 hostname kernel: [   14.739813]  ffff880213eaf838 ffff880213eaf828 ffffffff81076536 ffff880213eaf858
Sep 26 11:41:57 hostname kernel: [   14.739832]  ffff880213eaf8c0 ffff880211bdb800 0000000000000001 ffff880211bdbb50
Sep 26 11:41:57 hostname kernel: [   14.739835] Call Trace:
Sep 26 11:41:57 hostname kernel: [   14.739841]  [<ffffffff817b0cc5>] dump_stack+0x45/0x57
Sep 26 11:41:57 hostname kernel: [   14.739845]  [<ffffffff81076536>] warn_slowpath_common+0x86/0xc0
Sep 26 11:41:57 hostname kernel: [   14.739848]  [<ffffffff810765b6>] warn_slowpath_fmt+0x46/0x50
Sep 26 11:41:57 hostname kernel: [   14.739865]  [<ffffffffc02333f1>] ? intel_pipe_config_compare+0xb31/0xc60 [i915]
Sep 26 11:41:57 hostname kernel: [   14.739879]  [<ffffffffc02337e5>] check_crtc_state+0x2c5/0x440 [i915]
Sep 26 11:41:57 hostname kernel: [   14.739898]  [<ffffffffc02472fe>] intel_modeset_check_state+0x20e/0x6b0 [i915]
Sep 26 11:41:57 hostname kernel: [   14.739913]  [<ffffffffc02484a7>] intel_crtc_set_config+0x4c7/0x580 [i915]
Sep 26 11:41:57 hostname kernel: [   14.739928]  [<ffffffffc00ba915>] ? drm_mode_create+0x25/0x60 [drm]
Sep 26 11:41:57 hostname kernel: [   14.739939]  [<ffffffffc00b4036>] drm_mode_set_config_internal+0x66/0x100 [drm]
Sep 26 11:41:57 hostname kernel: [   14.739951]  [<ffffffffc00b85f8>] drm_mode_setcrtc+0x3a8/0x4c0 [drm]
Sep 26 11:41:57 hostname kernel: [   14.739959]  [<ffffffffc00a9365>] drm_ioctl+0x125/0x610 [drm]
Sep 26 11:41:57 hostname kernel: [   14.739970]  [<ffffffffc00b8250>] ? drm_mode_setplane+0x1b0/0x1b0 [drm]
Sep 26 11:41:57 hostname kernel: [   14.739974]  [<ffffffff81200075>] do_vfs_ioctl+0x285/0x470
Sep 26 11:41:57 hostname kernel: [   14.739977]  [<ffffffff8108190f>] ? recalc_sigpending+0x1f/0x60
Sep 26 11:41:57 hostname kernel: [   14.739980]  [<ffffffff810828b2>] ? __set_task_blocked+0x32/0x70
Sep 26 11:41:57 hostname kernel: [   14.739983]  [<ffffffff812002d9>] SyS_ioctl+0x79/0x90
Sep 26 11:41:57 hostname kernel: [   14.739986]  [<ffffffff817b7532>] entry_SYSCALL_64_fastpath+0x16/0x75
Sep 26 11:41:57 hostname kernel: [   14.739989] ---[ end trace e56b2f0b5424666d ]---

ProblemType: Bug
DistroRelease: Ubuntu 15.10
Package: xorg 1:7.7+7ubuntu4
ProcVersionSignature: Ubuntu 4.2.0-11.13-generic 4.2.1
Uname: Linux 4.2.0-11-generic x86_64
.tmp.unity.support.test.0:
 
ApportVersion: 2.19-0ubuntu1
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
CurrentDesktop: Unity
Date: Sat Sep 26 18:47:30 2015
DistUpgraded: Fresh install
DistroCodename: wily
DistroVariant: ubuntu
GraphicsCard:
 Intel Corporation Haswell-ULT Integrated Graphics Controller [8086:0a16] (rev 09) (prog-if 00 [VGA controller])
   Subsystem: Dell Device [1028:060a]
InstallationDate: Installed on 2014-02-14 (588 days ago)
InstallationMedia: Ubuntu 13.10 "Saucy Salamander" - Release amd64 (20131016.1)
MachineType: Dell Inc. XPS13 9333
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.2.0-11-generic root=/dev/mapper/ubuntu--vg-root ro quiet splash vt.handoff=7
SourcePackage: xorg
Symptom: display
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 12/11/2013
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A02
dmi.board.name: 0GFTRT
dmi.board.vendor: Dell Inc.
dmi.board.version: A00
dmi.chassis.type: 8
dmi.chassis.vendor: Dell Inc.
dmi.chassis.version: 0.1
dmi.modalias: dmi:bvnDellInc.:bvrA02:bd12/11/2013:svnDellInc.:pnXPS139333:pvr:rvnDellInc.:rn0GFTRT:rvrA00:cvnDellInc.:ct8:cvr0.1:
dmi.product.name: XPS13 9333
dmi.sys.vendor: Dell Inc.
version.compiz: compiz 1:0.9.12.2+15.10.20150908-0ubuntu1
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.64-1
version.libgl1-mesa-dri: libgl1-mesa-dri 11.0.0-1ubuntu1
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 11.0.0-1ubuntu1
version.xserver-xorg-core: xserver-xorg-core 2:1.17.2-1ubuntu7
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.9.2-1ubuntu1
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.5.0+git20150819-0ubuntu1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917+git20150808-0ubuntu2
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.11-1ubuntu3
xserver.bootTime: Sat Sep 26 18:46:41 2015
xserver.configfile: default
xserver.errors:
 
xserver.logfile: /var/log/Xorg.0.log
xserver.outputs:
 product id                                4933 
 vendor                                     CMN
xserver.version: 2:1.17.2-1ubuntu7

** Affects: linux (Ubuntu)
     Importance: Low
         Status: Incomplete


** Tags: amd64 apport-bug bios-outdated-a08 compiz-0.9 ubuntu wily
-- 
Dell XPS 2013 - [drm:intel_pipe_config_compare [i915]] *ERROR* mismatch in ips_enabled
https://bugs.launchpad.net/bugs/1500080
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