I was tailing /var/log/kern.log when I switch to a new user, and then back to mine user again - then the screen goes blank. Here is the tail:
Dec 26 17:35:25 nuc gnome-session-binary[3980]: Entering running state Dec 26 17:36:36 nuc kernel: [ 2890.006683] ------------[ cut here ]------------ Dec 26 17:36:36 nuc kernel: [ 2890.006725] WARNING: CPU: 1 PID: 1037 at /build/linux-7x12eW/linux-4.4.0/drivers/gpu/drm/drm_irq.c:1326 drm_wait_one_vblank+0x1b5/0x1c0 [drm]() Dec 26 17:36:36 nuc kernel: [ 2890.006728] vblank wait timed out on crtc 0 Dec 26 17:36:36 nuc kernel: [ 2890.006730] Modules linked in: cfg80211 snd_hda_codec_hdmi snd_hda_intel snd_hda_codec snd_hda_core snd_hwdep intel_rapl snd_pcm x86_pkg_temp_thermal intel_powerclamp corete mp kvm_intel snd_seq_midi snd_seq_midi_event kvm snd_rawmidi irqbypass crct10dif_pclmul crc32_pclmul ghash_clmulni_intel cryptd snd_seq joydev snd_seq_device input_leds snd_timer snd mei_me lpc_ich mei so undcore mac_hid binfmt_misc parport_pc ppdev lp parport autofs4 hid_logitech_hidpp hid_logitech_dj usbhid hid i915 e1000e i2c_algo_bit drm_kms_helper ahci syscopyarea libahci sysfillrect sysimgblt fb_sys_ fops drm ptp pps_core video fjes Dec 26 17:36:36 nuc kernel: [ 2890.006795] CPU: 1 PID: 1037 Comm: Xorg Not tainted 4.4.0-57-generic #78-Ubuntu Dec 26 17:36:36 nuc kernel: [ 2890.006798] Hardware name: /DCP847SKE, BIOS GKPPT10H.86A.0060.2016.1021.1324 10/21/2016 Dec 26 17:36:36 nuc kernel: [ 2890.006801] 0000000000000286 000000003f24334e ffff8802117abb08 ffffffff813f6f33 Dec 26 17:36:36 nuc kernel: [ 2890.006806] ffff8802117abb50 ffffffffc0067b38 ffff8802117abb40 ffffffff810812d2 Dec 26 17:36:36 nuc kernel: [ 2890.006811] ffff880035667800 0000000000000000 0000000000000000 000000000002a4a0 Dec 26 17:36:36 nuc kernel: [ 2890.006816] Call Trace: Dec 26 17:36:36 nuc kernel: [ 2890.006825] [<ffffffff813f6f33>] dump_stack+0x63/0x90 Dec 26 17:36:36 nuc kernel: [ 2890.006831] [<ffffffff810812d2>] warn_slowpath_common+0x82/0xc0 Dec 26 17:36:36 nuc kernel: [ 2890.006836] [<ffffffff8108136c>] warn_slowpath_fmt+0x5c/0x80 Dec 26 17:36:36 nuc kernel: [ 2890.006842] [<ffffffff810c3da5>] ? finish_wait+0x55/0x70 Dec 26 17:36:36 nuc kernel: [ 2890.006864] [<ffffffffc00372e5>] drm_wait_one_vblank+0x1b5/0x1c0 [drm] Dec 26 17:36:36 nuc kernel: [ 2890.006870] [<ffffffff810c4240>] ? wake_atomic_t_function+0x60/0x60 Dec 26 17:36:36 nuc kernel: [ 2890.006923] [<ffffffffc01dbe1a>] intel_atomic_commit+0x43a/0x6f0 [i915] Dec 26 17:36:36 nuc kernel: [ 2890.006953] [<ffffffffc005000f>] ? drm_atomic_set_crtc_for_connector+0x6f/0xe0 [drm] Dec 26 17:36:36 nuc kernel: [ 2890.006981] [<ffffffffc0051017>] drm_atomic_commit+0x37/0x60 [drm] Dec 26 17:36:36 nuc kernel: [ 2890.006998] [<ffffffffc00e6dc6>] drm_atomic_helper_set_config+0x76/0xb0 [drm_kms_helper] Dec 26 17:36:36 nuc kernel: [ 2890.007024] [<ffffffffc003fe42>] drm_mode_set_config_internal+0x62/0x100 [drm] Dec 26 17:36:36 nuc kernel: [ 2890.007050] [<ffffffffc004449c>] drm_mode_setcrtc+0x3cc/0x4f0 [drm] Dec 26 17:36:36 nuc kernel: [ 2890.007071] [<ffffffffc0035752>] drm_ioctl+0x152/0x540 [drm] Dec 26 17:36:36 nuc kernel: [ 2890.007096] [<ffffffffc00440d0>] ? drm_mode_setplane+0x1b0/0x1b0 [drm] Dec 26 17:36:36 nuc kernel: [ 2890.007102] [<ffffffff8122224f>] do_vfs_ioctl+0x29f/0x490 Dec 26 17:36:36 nuc kernel: [ 2890.007106] [<ffffffff81210df1>] ? __sb_end_write+0x21/0x30 Dec 26 17:36:36 nuc kernel: [ 2890.007112] [<ffffffff8120e9fd>] ? vfs_write+0x15d/0x1a0 Dec 26 17:36:36 nuc kernel: [ 2890.007116] [<ffffffff812224b9>] SyS_ioctl+0x79/0x90 Dec 26 17:36:36 nuc kernel: [ 2890.007122] [<ffffffff818374f2>] entry_SYSCALL_64_fastpath+0x16/0x71 Dec 26 17:36:36 nuc kernel: [ 2890.007126] ---[ end trace a947275226443206 ]--- Dec 26 17:36:48 nuc kernel: [ 2902.392357] sysrq: SysRq : Emergency Sync Dec 26 17:36:48 nuc kernel: [ 2902.403506] Emergency Sync complete Dec 26 17:36:49 nuc kernel: [ 2903.028358] sysrq: SysRq : Emergency Remount R/O The tail starts with the user switch to a new user, and ends with me pressing ALT+SysRq+(S+U+B), to reboot the system. -- 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/1652644 Title: Switching users in Ubuntu/Ubuntu Gnome freezes graphics Status in linux package in Ubuntu: Confirmed Bug description: This bug was present in Ubuntu Gnome 16.04 LTS with GDM, but did a clean install of Ubutnu 16.04 LTS with Unity and LightDM, and the bug is still present. How to reproduce: 1. Boot the system, wait for LightDM to start and show the Ubuntu Unity greeter. 2. Log in as a user. 3. From the power menu (top right), choose an other user 4. In the password-promt (greeter) for the user, type in the correct password At this point, one of three thing might happen: a- The desktop, desktop icons, Unity-launcher and main menu for the user is loaded. The user can use the system as expected! b- The desktop, desktop icons and Unity-launcher the user is loaded. However, just before the main-menu-bar at the tops loads, the the graphics freezes. I can move the cursor, but that's it. It is not possible to click or do anything with the mouse-cursor. c- Same as (b), but during this process the screen goes complete blank (black), with only the cursor showing (and moving). When (b) or (c), pressing ALT+F1-F6 does not help, the screen just stays the same (except the cursor dispersers). Pressing ALT+F7 afterwards does not bring the cursor back. The system has not frozen. I can SSH to the box and it lives as nothing has happened. It's only effecting the display/graphics. This bug happens about 1/3 of the times I switch the user. Sometimes I can switch to and from users several times (2-5) before this bug comes to life. ProblemType: Bug DistroRelease: Ubuntu 16.04 Package: linux-image-4.4.0-57-generic 4.4.0-57.78 ProcVersionSignature: Ubuntu 4.4.0-57.78-generic 4.4.35 Uname: Linux 4.4.0-57-generic x86_64 ApportVersion: 2.20.1-0ubuntu2.4 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: sitron 1903 F.... pulseaudio Date: Mon Dec 26 16:58:42 2016 HibernationDevice: RESUME=UUID=9d82d48a-107c-4d15-844d-c4ba62a3d320 InstallationDate: Installed on 2016-12-18 (8 days ago) InstallationMedia: Ubuntu 16.04.1 LTS "Xenial Xerus" - Release amd64 (20160719) IwConfig: lo no wireless extensions. eno1 no wireless extensions. Lsusb: Bus 002 Device 003: ID 046d:c52b Logitech, Inc. Unifying Receiver Bus 002 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub Bus 002 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 001 Device 002: ID 8087:0024 Intel Corp. Integrated Rate Matching Hub Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub ProcFB: 0 inteldrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-57-generic root=UUID=2a82deba-0eba-4358-b17c-65be40fe066f ro quiet splash vt.handoff=7 PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: Home directory not accessible: Permission denied No PulseAudio daemon running, or not running as session daemon. RelatedPackageVersions: linux-restricted-modules-4.4.0-57-generic N/A linux-backports-modules-4.4.0-57-generic N/A linux-firmware 1.157.6 RfKill: SourcePackage: linux UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 10/21/2016 dmi.bios.vendor: Intel Corp. dmi.bios.version: GKPPT10H.86A.0060.2016.1021.1324 dmi.board.name: DCP847SKE dmi.board.vendor: Intel Corporation dmi.board.version: G80890-105 dmi.chassis.type: 3 dmi.modalias: dmi:bvnIntelCorp.:bvrGKPPT10H.86A.0060.2016.1021.1324:bd10/21/2016:svn:pn:pvr:rvnIntelCorporation:rnDCP847SKE:rvrG80890-105:cvn:ct3:cvr: To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1652644/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
