<div dir="ltr">LightDM on restart just shuts down the X servers and starts them again. So I suspect that it is an X / video driver issue if the X servers are running but nothing is shown. Looking at /var/log/lightdm/lightdm.log will give more information about what LightDM thought the issue might have been. </div> <div class="gmail_quote"><div dir="ltr">On Mon, 12 Mar 2018 at 06:23 4DCSolutions <<a href="mailto:jack.koch@4dcsolutions.com">jack.koch@4dcsolutions.com</a>> wrote: </div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">I have lightdm 1:1.24.1-3 installed on and Intel NUC. it is enabled and started. ● lightdm.service - Light Display Manager Loaded: loaded (/usr/lib/systemd/system/lightdm.service; enabled; vendor preset: disabled) Active: active (running) since Fri 2018-03-09 14:50:28 EST; 15min ago Docs: man:lightdm(1) Main PID: 749 (lightdm) Tasks: 6 (limit: 4915) CGroup: /system.slice/lightdm.service ├─749 /usr/bin/lightdm └─755 /usr/lib/xorg-server/Xorg :0 -seat seat0 -auth /run/lightdm/root/:0 -nolisten tcp vt7 -novtswitch I have been running this system, OS, and configuration for over two years with no issues at all. Mar 09 14:50:28 appenzeller systemd[1]: Starting Light Display Manager... Mar 09 14:50:28 appenzeller systemd[1]: Started Light Display Manager. Mar 09 14:50:28 appenzeller lightdm[749]: g_object_unref: assertion 'G_IS_OBJECT (object)' failed Mar 09 14:50:29 appenzeller lightdm[771]: pam_unix(lightdm-greeter:session): session opened for user lightdm by (uid=0) sytem data from inxi -F System: Host: appenzeller Kernel: 4.15.7-1-ARCH x86_64 bits: 64 Desktop: Cinnamon 3.6.7 Distro: Arch Linux Machine: Device: desktop Mobo: Intel model: NUC5i5MYBE v: H47797-205 serial: N/A UEFI: Intel v: MYBDWi5v.86A.0026.2015.0820.1501 date: 08/20/2015 CPU: Dual core Intel Core i5-5300U (-MT-MCP-) cache: 3072 KB clock speeds: max: 2900 MHz 1: 2290 MHz 2: 2037 MHz 3: 2143 MHz 4: 2093 MHz Graphics: Card: Intel HD Graphics 5500 Display Server: X.Org 1.19.6 driver: i915 Resolution: 3840x2160@30.00hz OpenGL: renderer: llvmpipe (LLVM 5.0, 256 bits) version: 3.3 Mesa 17.3.6 Audio: Card-1 Intel Wildcat Point-LP High Definition Audio Controller driver: snd_hda_intel Card-2 Intel Broadwell-U Audio Controller driver: snd_hda_intel Card-3 GN Netcom driver: USB Audio Sound: Advanced Linux Sound Architecture v: k4.15.7-1-ARCH Network: Card: Intel Ethernet Connection (3) I218-LM driver: e1000e IF: enp0s25 state: up speed: 1000 Mbps duplex: full mac: b8:ae:ed:79:c4:74 Drives: HDD Total Size: 128.0GB (52.4% used) ID-1: /dev/sda model: TS128GMTS800 size: 128.0GB Partition: ID-1: / size: 44G used: 24G (56%) fs: ext4 dev: /dev/sda2 ID-2: /home size: 70G used: 36G (54%) fs: ext4 dev: /dev/sda4 ID-3: swap-1 size: 4.29GB used: 0.00GB (0%) fs: swap dev: /dev/sda3 Sensors: System Temperatures: cpu: 29.8C mobo: 27.8C Fan Speeds (in rpm): cpu: N/A Info: Processes: 140 Uptime: 1 min Memory: 375.5/15911.8MB Client: Shell (bash) inxi: 2.3.56 I had just updated the system with these packages: [2018-03-09 07:22] [ALPM] upgraded libxml2 (2.9.7+4+g72182550-2 -> 2.9.8-1) [2018-03-09 07:22] [ALPM] upgraded libinput (1.10.1-1 -> 1.10.2-1) [2018-03-09 07:22] [ALPM] upgraded harfbuzz (1.7.5-1 -> 1.7.6-1) [2018-03-09 07:22] [ALPM] upgraded libunistring (0.9.8-1 -> 0.9.9-1) [2018-03-09 07:22] [ALPM] upgraded xcb-proto (1.12-3 -> 1.13-1) [2018-03-09 07:22] [ALPM] upgraded libxcb (1.12-1 -> 1.13-1) [2018-03-09 07:22] [ALPM] upgraded libdrm (2.4.90-3 -> 2.4.91-1) [2018-03-09 07:22] [ALPM] upgraded qt5-base (5.10.1-3 -> 5.10.1-4) [2018-03-09 07:22] [ALPM] upgraded akonadi (17.12.2-2 -> 17.12.3-1) [2018-03-09 07:22] [ALPM] upgraded kmime (17.12.2-1 -> 17.12.3-1) [2018-03-09 07:22] [ALPM] upgraded akonadi-mime (17.12.2-1 -> 17.12.3-1) [2018-03-09 07:22] [ALPM] upgraded ksmtp (17.12.2-1 -> 17.12.3-1) [2018-03-09 07:22] [ALPM] upgraded kmailtransport (17.12.2-1 -> 17.12.3-1) [2018-03-09 07:22] [ALPM] upgraded kcalcore (17.12.2-1 -> 17.12.3-1) [2018-03-09 07:22] [ALPM] upgraded kpimtextedit (17.12.2-1 -> 17.12.3-1) [2018-03-09 07:22] [ALPM] upgraded kidentitymanagement (17.12.2-1 -> 17.12.3-1) [2018-03-09 07:22] [ALPM] upgraded kcalutils (17.12.2-1 -> 17.12.3-1) [2018-03-09 07:22] [ALPM] upgraded kcontacts (17.12.2-1 -> 17.12.3-1) [2018-03-09 07:22] [ALPM] upgraded akonadi-contacts (17.12.2-1 -> 17.12.3-1) [2018-03-09 07:22] [ALPM] upgraded akonadi-calendar (17.12.2-1 -> 17.12.3-1) [2018-03-09 07:22] [ALPM] upgraded akonadi-search (17.12.2-1 -> 17.12.3-1) [2018-03-09 07:22] [ALPM] upgraded libkleo (17.12.2-1 -> 17.12.3-1) [2018-03-09 07:22] [ALPM] upgraded kldap (17.12.2-1 -> 17.12.3-1) [2018-03-09 07:22] [ALPM] upgraded libkdepim (17.12.2-1 -> 17.12.3-1) [2018-03-09 07:22] [ALPM] upgraded kimap (17.12.2-1 -> 17.12.3-1) [2018-03-09 07:22] [ALPM] upgraded pimcommon (17.12.2-1 -> 17.12.3-1) [2018-03-09 07:22] [ALPM] upgraded grantleetheme (17.12.2-1 -> 17.12.3-1) [2018-03-09 07:22] [ALPM] upgraded kdepim-apps-libs (17.12.2-1 -> 17.12.3-1) [2018-03-09 07:22] [ALPM] upgraded calendarsupport (17.12.2-1 -> 17.12.3-1) [2018-03-09 07:22] [ALPM] upgraded libgravatar (17.12.2-1 -> 17.12.3-1) [2018-03-09 07:22] [ALPM] upgraded kmbox (17.12.2-1 -> 17.12.3-1) [2018-03-09 07:22] [ALPM] upgraded messagelib (17.12.2-1 -> 17.12.3-1) [2018-03-09 07:22] [ALPM] upgraded akonadiconsole (17.12.2-1 -> 17.12.3-1) I ran checkrestart which suggested among others that I restart lightdm.service. The monitor immediately went black. Nothing I have tried has brought back the display. The keyboard still works. I tested by ctrl-alt-F2 and logging in. I can ssh into the machine where I: Removed and reinstalled lightdm lightdm is running 750 ? Ssl 0:00 /usr/bin/lightdm 756 tty7 Ssl+ 0:35 /usr/lib/xorg-server/Xorg :0 -seat seat0 -auth /run/lightdm/root/:0 -nolisten tcp vt7 -novtswitch 772 ? Sl 0:00 lightdm --session-child 17 20 783 ? Ssl 0:26 /usr/bin/lightdm-webkit2-greeter 988 ? S< 0:00 /usr/NX/bin/nxexec --node --user lightdm --priority realtime --mode 0 --pid 12 and obviously waiting for a login. Ran startx from tty2, Xorg and cinnamon run 2424 tty2 Sl 0:00 /usr/lib/xorg-server/Xorg -nolisten tcp :1 vt2 -auth /tmp/serverauth.V1TL95uMJO 2430 tty2 Sl 0:00 cinnamon-session 2473 tty2 Sl 0:00 /usr/lib/cinnamon-settings-daemon/csd-keyboard 2474 tty2 Sl 0:00 /usr/lib/cinnamon-settings-daemon/csd-automount 2475 tty2 Sl 0:00 /usr/lib/cinnamon-settings-daemon/csd-cursor 2476 tty2 Sl 0:00 /usr/lib/cinnamon-settings-daemon/csd-wacom 2477 tty2 Sl 0:00 /usr/lib/cinnamon-settings-daemon/csd-a11y-keyboard 2478 tty2 Sl 0:00 /usr/lib/cinnamon-settings-daemon/csd-orientation 2481 tty2 Sl 0:00 /usr/lib/cinnamon-settings-daemon/csd-screensaver-proxy 2484 tty2 Sl 0:00 /usr/lib/cinnamon-settings-daemon/csd-print-notifications 2489 tty2 Sl 0:00 /usr/lib/cinnamon-settings-daemon/csd-sound 2498 tty2 Sl 0:00 /usr/lib/cinnamon-settings-daemon/csd-xrandr 2500 tty2 Sl 0:00 /usr/lib/cinnamon-settings-daemon/csd-power 2502 tty2 Sl 0:00 /usr/lib/cinnamon-settings-daemon/csd-xsettings 2504 tty2 Sl 0:00 /usr/lib/cinnamon-settings-daemon/csd-clipboard 2510 tty2 Sl 0:00 /usr/lib/cinnamon-settings-daemon/csd-color 2513 tty2 Sl 0:00 /usr/lib/cinnamon-settings-daemon/csd-background 2516 tty2 Sl 0:00 /usr/lib/cinnamon-settings-daemon/csd-a11y-settings 2519 tty2 Sl 0:00 /usr/lib/cinnamon-settings-daemon/csd-housekeeping 2521 tty2 Sl 0:00 /usr/lib/cinnamon-settings-daemon/csd-mouse 2526 tty2 Sl 0:00 /usr/lib/cinnamon-settings-daemon/csd-media-keys 2606 tty2 Sl 0:00 /usr/lib/cinnamon-settings-daemon/csd-printer 2640 tty2 Sl 0:00 /usr/bin/python3 /usr/bin/cinnamon-launcher 2650 tty2 Sl 0:07 cinnamon --replace 2679 tty2 Sl 0:00 /usr/bin/python3 /usr/bin/cinnamon-killer-daemon 2913 tty2 Sl 0:01 cinnamon-screensaver Tried switching display ports, switching cables, switching monitors. Then I tried booting a live ISO, the display was still blank. I tried to enter the BIOS to check if fast boot was turned on but again no display. I removed the xf86-video-intel driver, as suggested by Antergos, still blank. So my last hope before using the machine as a paper weight is to ask what does lightdm do on a restart. Is there some very low level system writing taking place that could hopefully be manually reversed. Any suggestions would be welcome. Thank you _______________________________________________ LightDM mailing list <a href="mailto:LightDM@lists.freedesktop.org" target="_blank">LightDM@lists.freedesktop.org</a> <a href="https://lists.freedesktop.org/mailman/listinfo/lightdm" rel="noreferrer" target="_blank">https://lists.freedesktop.org/mailman/listinfo/lightdm</a> </blockquote></div>