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[Matthew Lovibond <matt@xxxxxxxxxxxxxxxx>]

I've just noticed that the problem doesn't happen when running from the
15.10 live CD.

I've attached the dmesg from the system running from a live cd.

** Attachment added: "dmesg from 15.10 live cd"
   https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1507695/+attachment/4501210/+files/dmesg-livecd

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https://bugs.launchpad.net/bugs/1507695

Title:
  i915 intel graphics driver not working (using llvmpipe as fallback)

Status in linux package in Ubuntu:
  Incomplete

Bug description:
  Various stack traces in dmesg:

  [   34.354180] [drm:intel_pipe_config_compare [i915]] *ERROR* mismatch in ips_enabled (expected 1, found 0)
  [   34.354181] ------------[ cut here ]------------
  [   34.354204] WARNING: CPU: 0 PID: 880 at /build/linux-AxjFAn/linux-4.2.0/drivers/gpu/drm/i915/intel_display.c:12326 check_crtc_state+0x2c5/0x440 [i915]()
  [   34.354204] pipe state doesn't match!
  [   34.354240] Modules linked in: xt_CHECKSUM iptable_mangle ipt_MASQUERADE nf_nat_masquerade_ipv4 iptable_nat nf_nat_ipv4 nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack nf_conntrack ipt_REJECT nf_reject_ipv4 xt_tcpudp bridge stp llc ebtable_filter ebtables ip6table_filter ip6_tables iptable_filter ip_tables x_tables bnep zram lz4_compress joydev isl29018(C) cyapatp industrialio crc_itu_t arc4 ath9k ath9k_common ath9k_hw snd_hda_codec_realtek snd_hda_codec_generic ath snd_hda_codec_hdmi cros_ec_lpc cros_ec intel_rapl iosf_mbi x86_pkg_temp_thermal snd_hda_intel intel_powerclamp chromeos_laptop coretemp snd_hda_codec snd_seq_midi mac80211 snd_hda_core snd_seq_midi_event kvm_intel snd_hwdep snd_rawmidi kvm snd_pcm uvcvideo videobuf2_vmalloc cfg80211 videobuf2_memops videobuf2_core v4l2_common input_leds
  [   34.354266]  snd_seq serio_raw ath3k btusb snd_seq_device videodev snd_timer btrtl btbcm media lpc_ich btintel bluetooth dw_dmac_pci snd shpchp i2c_designware_pci soundcore 8250_fintek tpm_infineon mac_hid dw_dmac dw_dmac_core 8250_dw i2c_designware_platform spi_pxa2xx_platform i2c_designware_core parport_pc ppdev lp parport autofs4 drbg ansi_cprng xts gf128mul algif_skcipher af_alg dm_crypt crct10dif_pclmul crc32_pclmul i915 ghash_clmulni_intel cryptd i2c_algo_bit drm_kms_helper sdhci_acpi ahci libahci drm sdhci video
  [   34.354269] CPU: 0 PID: 880 Comm: Xorg Tainted: G        WC      4.2.0-16-generic #19-Ubuntu
  [   34.354270] Hardware name: Acer Peppy, BIOS          01/16/2015
  [   34.354273]  0000000000000000 0000000011214967 ffff88007241f788 ffffffff817e8c09
  [   34.354275]  0000000000000000 ffff88007241f7e0 ffff88007241f7c8 ffffffff8107b3c6
  [   34.354277]  ffff88007241f808 ffff88007241f870 ffff8800359b7000 0000000000000001
  [   34.354278] Call Trace:
  [   34.354284]  [<ffffffff817e8c09>] dump_stack+0x45/0x57
  [   34.354289]  [<ffffffff8107b3c6>] warn_slowpath_common+0x86/0xc0
  [   34.354291]  [<ffffffff8107b455>] warn_slowpath_fmt+0x55/0x70
  [   34.354310]  [<ffffffffc0171bc1>] ? intel_pipe_config_compare+0xb31/0xc60 [i915]
  [   34.354326]  [<ffffffffc0171fb5>] check_crtc_state+0x2c5/0x440 [i915]
  [   34.354347]  [<ffffffffc0185d6d>] intel_modeset_check_state+0x21d/0x6d0 [i915]
  [   34.354365]  [<ffffffffc0186f27>] intel_crtc_set_config+0x4c7/0x580 [i915]
  [   34.354381]  [<ffffffffc00104c6>] drm_mode_set_config_internal+0x66/0x100 [drm]
  [   34.354389]  [<ffffffffc00ce245>] drm_fb_helper_pan_display+0x95/0xe0 [drm_kms_helper]
  [   34.354409]  [<ffffffffc01942fa>] intel_fbdev_pan_display+0x1a/0x60 [i915]
  [   34.354412]  [<ffffffff810c36be>] ? down+0x2e/0x50
  [   34.354416]  [<ffffffff81447a6f>] fb_pan_display+0xcf/0x160
  [   34.354420]  [<ffffffff814486cc>] do_fb_ioctl+0x3cc/0x650
  [   34.354423]  [<ffffffff811bae97>] ? mmap_region+0x1d7/0x640
  [   34.354427]  [<ffffffff81448983>] fb_ioctl+0x33/0x40
  [   34.354430]  [<ffffffff812108a5>] do_vfs_ioctl+0x295/0x480
  [   34.354433]  [<ffffffff81210b09>] SyS_ioctl+0x79/0x90
  [   34.354437]  [<ffffffff817ef9f2>] entry_SYSCALL_64_fastpath+0x16/0x75
  [   34.354439] ---[ end trace b224b66765a2e759 ]---
  [   34.883327] [drm:intel_pipe_config_compare [i915]] *ERROR* mismatch in ips_enabled (expected 1, found 0)
  [   34.883328] ------------[ cut here ]------------
  [   34.883350] WARNING: CPU: 0 PID: 880 at /build/linux-AxjFAn/linux-4.2.0/drivers/gpu/drm/i915/intel_display.c:12326 check_crtc_state+0x2c5/0x440 [i915]()
  [   34.883351] pipe state doesn't match!
  [   34.883386] Modules linked in: xt_CHECKSUM iptable_mangle ipt_MASQUERADE nf_nat_masquerade_ipv4 iptable_nat nf_nat_ipv4 nf_nat nf_conntrack_ipv4 nf_defrag_ipv4 xt_conntrack nf_conntrack ipt_REJECT nf_reject_ipv4 xt_tcpudp bridge stp llc ebtable_filter ebtables ip6table_filter ip6_tables iptable_filter ip_tables x_tables bnep zram lz4_compress joydev isl29018(C) cyapatp industrialio crc_itu_t arc4 ath9k ath9k_common ath9k_hw snd_hda_codec_realtek snd_hda_codec_generic ath snd_hda_codec_hdmi cros_ec_lpc cros_ec intel_rapl iosf_mbi x86_pkg_temp_thermal snd_hda_intel intel_powerclamp chromeos_laptop coretemp snd_hda_codec snd_seq_midi mac80211 snd_hda_core snd_seq_midi_event kvm_intel snd_hwdep snd_rawmidi kvm snd_pcm uvcvideo videobuf2_vmalloc cfg80211 videobuf2_memops videobuf2_core v4l2_common input_leds
  [   34.883412]  snd_seq serio_raw ath3k btusb snd_seq_device videodev snd_timer btrtl btbcm media lpc_ich btintel bluetooth dw_dmac_pci snd shpchp i2c_designware_pci soundcore 8250_fintek tpm_infineon mac_hid dw_dmac dw_dmac_core 8250_dw i2c_designware_platform spi_pxa2xx_platform i2c_designware_core parport_pc ppdev lp parport autofs4 drbg ansi_cprng xts gf128mul algif_skcipher af_alg dm_crypt crct10dif_pclmul crc32_pclmul i915 ghash_clmulni_intel cryptd i2c_algo_bit drm_kms_helper sdhci_acpi ahci libahci drm sdhci video
  [   34.883416] CPU: 0 PID: 880 Comm: Xorg Tainted: G        WC      4.2.0-16-generic #19-Ubuntu
  [   34.883417] Hardware name: Acer Peppy, BIOS          01/16/2015
  [   34.883420]  0000000000000000 0000000011214967 ffff88007241f7b8 ffffffff817e8c09
  [   34.883422]  0000000000000000 ffff88007241f810 ffff88007241f7f8 ffffffff8107b3c6
  [   34.883423]  ffff88007241f838 ffff88007241f8a0 ffff8800359b7000 0000000000000001
  [   34.883424] Call Trace:
  [   34.883430]  [<ffffffff817e8c09>] dump_stack+0x45/0x57
  [   34.883435]  [<ffffffff8107b3c6>] warn_slowpath_common+0x86/0xc0
  [   34.883438]  [<ffffffff8107b455>] warn_slowpath_fmt+0x55/0x70
  [   34.883457]  [<ffffffffc0171bc1>] ? intel_pipe_config_compare+0xb31/0xc60 [i915]
  [   34.883474]  [<ffffffffc0171fb5>] check_crtc_state+0x2c5/0x440 [i915]
  [   34.883496]  [<ffffffffc0185d6d>] intel_modeset_check_state+0x21d/0x6d0 [i915]
  [   34.883514]  [<ffffffffc018626e>] intel_connector_dpms+0x4e/0x70 [i915]
  [   34.883522]  [<ffffffffc00ce333>] drm_fb_helper_dpms.isra.5+0xa3/0xf0 [drm_kms_helper]
  [   34.883528]  [<ffffffffc00ce3ba>] drm_fb_helper_blank+0x3a/0x70 [drm_kms_helper]
  [   34.883547]  [<ffffffffc019435a>] intel_fbdev_blank+0x1a/0x60 [i915]
  [   34.883551]  [<ffffffff8109b966>] ? blocking_notifier_call_chain+0x16/0x20
  [   34.883556]  [<ffffffff81447c06>] fb_blank+0x66/0xc0
  [   34.883559]  [<ffffffff8144858f>] do_fb_ioctl+0x28f/0x650
  [   34.883562]  [<ffffffff811af6f2>] ? get_user_pages+0x52/0x60
  [   34.883565]  [<ffffffff81189a72>] ? __free_pages+0x22/0x30
  [   34.883567]  [<ffffffff810782b6>] ? mmput+0x16/0x140
  [   34.883571]  [<ffffffff81448983>] fb_ioctl+0x33/0x40
  [   34.883574]  [<ffffffff812108a5>] do_vfs_ioctl+0x295/0x480
  [   34.883577]  [<ffffffff8121d7a4>] ? mntput+0x24/0x40
  [   34.883579]  [<ffffffff811fef30>] ? __fput+0x190/0x220
  [   34.883582]  [<ffffffff81210b09>] SyS_ioctl+0x79/0x90
  [   34.883585]  [<ffffffff817ef9f2>] entry_SYSCALL_64_fastpath+0x16/0x75
  [   34.883587] ---[ end trace b224b66765a2e75a ]---

  https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1492764

  ProblemType: Bug
  DistroRelease: Ubuntu 15.10
  Package: linux-image-4.2.0-16-generic 4.2.0-16.19 [modified: boot/vmlinuz-4.2.0-16-generic]
  ProcVersionSignature: Ubuntu 4.2.0-16.19-generic 4.2.3
  Uname: Linux 4.2.0-16-generic x86_64
  ApportVersion: 2.19.1-0ubuntu3
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  matt       1867 F.... pulseaudio
   /dev/snd/controlC0:  matt       1867 F.... pulseaudio
  CurrentDesktop: Unity
  Date: Mon Oct 19 17:45:40 2015
  HibernationDevice: RESUME=UUID=62e2adc2-0621-45d7-b1b4-3e3aa03c0ffc
  InstallationDate: Installed on 2015-10-16 (3 days ago)
  InstallationMedia: Ubuntu 15.10 "Wily Werewolf" - Alpha amd64 (20151016)
  MachineType: Acer Peppy
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.2.0-16-generic root=/dev/mapper/ubuntu--vg-root ro
  RelatedPackageVersions:
   linux-restricted-modules-4.2.0-16-generic N/A
   linux-backports-modules-4.2.0-16-generic  N/A
   linux-firmware                            1.149
  SourcePackage: linux
  StagingDrivers: isl29018
  UdevLog: Error: [Errno 2] No such file or directory: '/var/log/udev'
  UpgradeStatus: No upgrade log present (probably fresh install)
  dmi.bios.date: 01/16/2015
  dmi.bios.vendor: coreboot
  dmi.chassis.type: 3
  dmi.chassis.vendor: Acer
  dmi.modalias: dmi:bvncoreboot:bvr:bd01/16/2015:svnAcer:pnPeppy:pvr1.0:cvnAcer:ct3:cvr:
  dmi.product.name: Peppy
  dmi.product.version: 1.0
  dmi.sys.vendor: Acer

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