Just to add an update, I also tested the mainline 4.0.0-040000-generic kernel and experienced the crash. So the fix must have been put in between 4.0 and 4.2
-- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1486099 Title: Crash of Xorg under intel drm Status in linux package in Ubuntu: Incomplete Bug description: I am using an older Ubuntu mainline kernel with Vivid. The computer I am using is a Dell XPS 9343 which is known not to do too well with linux, like most new dell computers. However the only issue that actively bothers me the fact that Xorg is getting crashed all the time by the frame buffer drm in the intel driver. This can be observer in this trace, [33477.084660] ------------[ cut here ]------------ [33477.084688] WARNING: CPU: 0 PID: 901 at /build/linux-OdodyZ/linux-3.19.0/drivers/gpu/drm/i915/intel_display.c:1256 assert_plane.constprop.87+0x7b/0x90 [i915]() [33477.084689] plane A assertion failure (expected on, current off) [33477.084706] Modules linked in: isofs pci_stub vboxpci(OE) vboxnetadp(OE) vboxnetflt(OE) vboxdrv(OE) binfmt_misc rfcomm bnep nls_iso8859_1 cdc_acm btusb bluetooth uvcvideo videobuf2_vmalloc videobuf2_memops videobuf2_core v4l2_common videodev media usbhid joydev snd_hda_codec_hdmi wl(POE) dell_wmi hid_multitouch sparse_keymap intel_rapl iosf_mbi x86_pkg_temp_thermal intel_powerclamp coretemp kvm_intel dell_laptop dcdbas kvm crct10dif_pclmul crc32_pclmul ghash_clmulni_intel aesni_intel aes_x86_64 lrw gf128mul glue_helper ablk_helper cryptd serio_raw dell_led snd_hda_codec_realtek snd_soc_rt286 snd_hda_codec_generic snd_soc_core snd_compress snd_pcm_dmaengine i915 lpc_ich snd_hda_intel snd_seq_midi snd_hda_controller snd_seq_midi_event cfg80211 snd_hda_codec snd_hwdep rtsx_pci_ms drm_kms_helper memstick [33477.084720] mei_me snd_rawmidi snd_pcm drm i2c_algo_bit shpchp mei wmi int3403_thermal soc_button_array snd_seq snd_seq_device snd_timer snd soundcore i2c_hid hid video dw_dmac dw_dmac_core snd_soc_sst_acpi 8250_dw i2c_designware_platform i2c_designware_core spi_pxa2xx_platform int3402_thermal int3400_thermal acpi_thermal_rel processor_thermal_device acpi_pad mac_hid parport_pc ppdev lp parport autofs4 uas usb_storage rtsx_pci_sdmmc psmouse ahci libahci sdhci_acpi sdhci rtsx_pci [33477.084722] CPU: 0 PID: 901 Comm: Xorg Tainted: P W OE 3.19.0-25-generic #26-Ubuntu [33477.084723] Hardware name: Dell Inc. XPS 13 9343/0310JH, BIOS A05 07/14/2015 [33477.084725] ffffffffc0611310 ffff880212b076f8 ffffffff817c4518 00000000888e888e [33477.084726] ffff880212b07748 ffff880212b07738 ffffffff81076a6a ffff8802134c4200 [33477.084727] 0000000000000000 ffff880212f3d000 ffff880036582800 ffff880036582800 [33477.084727] Call Trace: [33477.084732] [<ffffffff817c4518>] dump_stack+0x45/0x57 [33477.084735] [<ffffffff81076a6a>] warn_slowpath_common+0x8a/0xc0 [33477.084736] [<ffffffff81076ae6>] warn_slowpath_fmt+0x46/0x50 [33477.084751] [<ffffffffc05ad57b>] assert_plane.constprop.87+0x7b/0x90 [i915] [33477.084764] [<ffffffffc05b57f1>] hsw_disable_ips+0x41/0x190 [i915] [33477.084777] [<ffffffffc05b5bb8>] intel_crtc_disable_planes+0x48/0x140 [i915] [33477.084788] [<ffffffffc05b691f>] haswell_crtc_disable+0x4f/0x3c0 [i915] [33477.084800] [<ffffffffc05b78b9>] __intel_set_mode+0xa59/0xc80 [i915] [33477.084812] [<ffffffffc05be48b>] intel_crtc_set_config+0xbfb/0xf70 [i915] [33477.084815] [<ffffffff810a73a8>] ? __enqueue_entity+0x78/0x80 [33477.084827] [<ffffffffc036fb36>] drm_mode_set_config_internal+0x66/0x100 [drm] [33477.084833] [<ffffffffc04016b8>] restore_fbdev_mode+0xc8/0xf0 [drm_kms_helper] [33477.084839] [<ffffffffc0403729>] drm_fb_helper_restore_fbdev_mode_unlocked+0x29/0x80 [drm_kms_helper] [33477.084843] [<ffffffffc04037a2>] drm_fb_helper_set_par+0x22/0x50 [drm_kms_helper] [33477.084857] [<ffffffffc05ca40a>] intel_fbdev_set_par+0x1a/0x60 [i915] [33477.084859] [<ffffffff814351fa>] fb_set_var+0x18a/0x410 [33477.084862] [<ffffffff8109fd99>] ? check_preempt_curr+0x89/0xa0 [33477.084863] [<ffffffff810a73a8>] ? __enqueue_entity+0x78/0x80 [33477.084865] [<ffffffff810aed70>] ? enqueue_entity+0x400/0xc30 [33477.084867] [<ffffffff8142bc29>] fbcon_blank+0x229/0x300 [33477.084869] [<ffffffff814bbb7a>] do_unblank_screen+0xba/0x1f0 [33477.084872] [<ffffffff814b166d>] complete_change_console+0x5d/0xf0 [33477.084873] [<ffffffff814b288a>] vt_ioctl+0x118a/0x1460 [33477.084881] [<ffffffffc036491c>] ? drm_ioctl+0x8c/0x680 [drm] [33477.084883] [<ffffffff814a4801>] tty_ioctl+0x411/0xcb0 [33477.084886] [<ffffffff811f5ca5>] ? do_readv_writev+0x185/0x280 [33477.084888] [<ffffffff81209370>] do_vfs_ioctl+0x2e0/0x4e0 [33477.084889] [<ffffffff812095f1>] SyS_ioctl+0x81/0xa0 [33477.084890] [<ffffffff817cb5cd>] system_call_fastpath+0x16/0x1b [33477.084891] ---[ end trace 4514549be501e890 ]--- [33479.411280] [drm:intel_cpu_fifo_underrun_irq_handler [i915]] *ERROR* CPU pipe A FIFO underrun I can confirm that the crash occurs in different ways according to different traces I've read but it would be impossible to compile all of them. The crashes of the screen are not apparent to any function done on the user end. They are random and can sometimes be very spaced out or sometimes happen many times in a row. In order to get the screen working without restarting lightdm, I have to switch into tty1 console then back to graphics mode. Hopefully someone knows how to debug this trace better than I. ProblemType: Bug DistroRelease: Ubuntu 15.04 Package: linux-image-3.19.0-25-generic 3.19.0-25.26 ProcVersionSignature: Ubuntu 3.19.0-25.26-generic 3.19.8-ckt2 Uname: Linux 3.19.0-25-generic x86_64 NonfreeKernelModules: wl ApportVersion: 2.17.2-0ubuntu1.2 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: trevor 2253 F.... pulseaudio /dev/snd/pcmC1D0p: trevor 2253 F...m pulseaudio /dev/snd/controlC1: trevor 2253 F.... pulseaudio CurrentDesktop: Unity Date: Tue Aug 18 11:17:04 2015 HibernationDevice: RESUME=UUID=c1e23580-c377-44de-ae32-8ad594e367d7 InstallationDate: Installed on 2015-05-14 (96 days ago) InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422) MachineType: Dell Inc. XPS 13 9343 ProcFB: 0 inteldrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.19.0-25-generic.efi.signed root=UUID=5f5b1a54-ec54-4290-994d-d83187dfa1e8 ro quiet splash vt.handoff=7 RelatedPackageVersions: linux-restricted-modules-3.19.0-25-generic N/A linux-backports-modules-3.19.0-25-generic N/A linux-firmware 1.143.2 SourcePackage: linux UdevLog: Error: [Errno 2] No such file or directory: '/var/log/udev' UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 07/14/2015 dmi.bios.vendor: Dell Inc. dmi.bios.version: A05 dmi.board.name: 0310JH dmi.board.vendor: Dell Inc. dmi.board.version: A00 dmi.chassis.type: 9 dmi.chassis.vendor: Dell Inc. dmi.modalias: dmi:bvnDellInc.:bvrA05:bd07/14/2015:svnDellInc.:pnXPS139343:pvr:rvnDellInc.:rn0310JH:rvrA00:cvnDellInc.:ct9:cvr: dmi.product.name: XPS 13 9343 dmi.sys.vendor: Dell Inc. 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