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.
On Mon, 12 Mar 2018 at 06:23 4DCSolutions <jack.koch at 4dcsolutions.com>
wrote:
> 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 at 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
> LightDM at lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/lightdm
>
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