Arch Linux

RottenSchnitzel

Member

Registered: 2021-12-11

Posts: 4

[SOLVED]Failed to start LightDM

Hello! I am pretty new to Arch and decided to run lightdm with xorg. After a reboot the message "[FAILED] Failed to start Light Display Manager." shows up without any further information.

I have no clue why this suddenly started happening so I require some help. Here my lightdm debug log:

[+0.00s] DEBUG: Logging to /var/log/lightdm/lightdm.log
[+0.00s] DEBUG: Starting Light Display Manager 1.30.0, UID=0 PID=725
[+0.00s] DEBUG: Loading configuration dirs from /usr/share/lightdm/lightdm.conf.d
[+0.00s] DEBUG: Loading configuration dirs from /usr/local/share/lightdm/lightdm.conf.d
[+0.00s] DEBUG: Loading configuration dirs from /etc/xdg/lightdm/lightdm.conf.d
[+0.00s] DEBUG: Loading configuration from /etc/lightdm/lightdm.conf
[+0.00s] DEBUG: Registered seat module local
[+0.00s] DEBUG: Registered seat module xremote
[+0.00s] DEBUG: Using D-Bus name org.freedesktop.DisplayManager
[+0.00s] DEBUG: _g_io_module_get_default: Found default implementation local (GLocalVfs) for ?gio-vfs?
[+0.00s] DEBUG: Monitoring logind for seats
[+0.00s] DEBUG: New seat added from logind: seat0
[+0.00s] DEBUG: Seat seat0: Loading properties from config section Seat:*
[+0.00s] DEBUG: Seat seat0 has property CanMultiSession=no
[+0.00s] DEBUG: Seat seat0: Starting
[+0.00s] DEBUG: Seat seat0: Creating greeter session
[+0.00s] DEBUG: Seat seat0: Creating display server of type x
[+0.00s] DEBUG: Could not run plymouth --ping: Failed to execute child process ?plymouth? (No such file or directory)
[+0.00s] DEBUG: Using VT 7
[+0.00s] DEBUG: Seat seat0: Starting local X display on VT 7
[+0.00s] DEBUG: XServer 0: Logging to /var/log/lightdm/x-0.log
[+0.00s] DEBUG: XServer 0: Writing X server authority to /run/lightdm/root/:0
[+0.00s] DEBUG: XServer 0: Launching X Server
[+0.00s] DEBUG: Launching process 731: /usr/bin/X :0 -seat seat0 -auth /run/lightdm/root/:0 -nolisten tcp vt7 -novtswitch
[+0.00s] DEBUG: XServer 0: Waiting for ready signal from X server :0
[+0.00s] DEBUG: Acquired bus name org.freedesktop.DisplayManager
[+0.00s] DEBUG: Registering seat with bus path /org/freedesktop/DisplayManager/Seat0
[+0.01s] WARNING: Error getting user list from org.freedesktop.Accounts: GDBus.Error:org.freedesktop.DBus.Error.ServiceUnknown: The name org.freedesktop.Accounts was not provided by any .service files
[+0.01s] DEBUG: Loading user config from /etc/lightdm/users.conf
[+0.01s] DEBUG: User matteo added
[+0.02s] DEBUG: Seat seat0 changes active session to
[+0.02s] DEBUG: Process 731 exited with return value 1
[+0.02s] DEBUG: XServer 0: X server stopped
[+0.02s] DEBUG: Releasing VT 7
[+0.02s] DEBUG: XServer 0: Removing X server authority /run/lightdm/root/:0
[+0.02s] DEBUG: Seat seat0: Display server stopped
[+0.02s] DEBUG: Seat seat0: Stopping session
[+0.02s] DEBUG: Seat seat0: Session stopped
[+0.02s] DEBUG: Seat seat0: Stopping display server, no sessions require it
[+0.02s] DEBUG: Seat seat0: Stopping; greeter display server failed to start
[+0.02s] DEBUG: Seat seat0: Stopping
[+0.02s] DEBUG: Seat seat0: Stopped
[+0.02s] DEBUG: Required seat has stopped
[+0.02s] DEBUG: Stopping display manager
[+0.02s] DEBUG: Display manager stopped
[+0.02s] DEBUG: Stopping daemon

This is my xorg log file:

[    35.337]
This is a pre-release version of the X server from The X.Org Foundation.
It is not supported in any way.
Bugs may be filed in the bugzilla at http://bugs.freedesktop.org/.
Select the "xorg" product for bugs you find in this release.
Before reporting bugs in pre-release versions please check the
latest version in the X.Org Foundation git repository.
See http://wiki.x.org/wiki/GitPage for git access instructions.
[    35.337]
X.Org X Server 1.21.1.1
X Protocol Version 11, Revision 0
[    35.337] Current Operating System: Linux rottendesktop 5.15.7-arch1-1 #1 SMP PREEMPT Wed, 08 Dec 2021 14:33:16 +0000 x86_64
[    35.337] Kernel command line: BOOT_IMAGE=/boot/vmlinuz-linux root=UUID=a2aa0468-f8b9-4ce8-ae9f-32ca98a45cf3 rw loglevel=3 quiet
[    35.337]
[    35.337] Current version of pixman: 0.40.0
[    35.337]    Before reporting problems, check http://wiki.x.org
        to make sure that you have the latest version.
[    35.337] Markers: (--) probed, (**) from config file, (==) default setting,
        (++) from command line, (!!) notice, (II) informational,
        (WW) warning, (EE) error, (NI) not implemented, (??) unknown.
[    35.337] (==) Log file: "/var/log/Xorg.0.log", Time: Sat Dec 11 11:11:15 2021
[    35.337] (==) Using config directory: "/etc/X11/xorg.conf.d"
[    35.337] (==) Using system config directory "/usr/share/X11/xorg.conf.d"
[    35.337] (==) No Layout section.  Using the first Screen section.
[    35.337] (==) No screen section available. Using defaults.
[    35.337] (**) |-->Screen "Default Screen Section" (0)
[    35.337] (**) |   |-->Monitor "<default monitor>"
[    35.337] (==) No monitor specified for screen "Default Screen Section".
        Using a default monitor configuration.
[    35.337] (==) Automatically adding devices
[    35.337] (==) Automatically enabling devices
[    35.337] (==) Automatically adding GPU devices
[    35.337] (==) Automatically binding GPU devices
[    35.337] (==) Max clients allowed: 256, resource mask: 0x1fffff
[    35.337] (WW) The directory "/usr/share/fonts/OTF" does not exist.
[    35.338]    Entry deleted from font path.
[    35.338] (WW) The directory "/usr/share/fonts/Type1" does not exist.
[    35.338]    Entry deleted from font path.
[    35.338] (==) FontPath set to:
        /usr/share/fonts/misc,
        /usr/share/fonts/TTF,
        /usr/share/fonts/100dpi,
        /usr/share/fonts/75dpi
[    35.338] (==) ModulePath set to "/usr/lib/xorg/modules"
[    35.338] (II) The server relies on udev to provide the list of input devices.
        If no devices become available, reconfigure udev or disable AutoAddDevices.
[    35.338] (II) Module ABI versions:
[    35.338]    X.Org ANSI C Emulation: 0.4
[    35.338]    X.Org Video Driver: 25.2
[    35.338]    X.Org XInput driver : 24.4
[    35.338]    X.Org Server Extension : 10.0
[    35.338] (++) using VT number 7

[    35.338] (II) systemd-logind: logind integration requires -keeptty and -keeptty was not provided, disabling logind integration
[    35.339] (--) PCI:*(1@0:0:0) 10de:13c2:19da:1366 rev 161, Mem @ 0xf6000000/16777216, 0xe0000000/268435456, 0xf0000000/33554432, I/O @ 0x0000e000/128, BIOS @ 0x????????/131072
[    35.339] (WW) Open ACPI failed (/var/run/acpid.socket) (No such file or directory)
[    35.339] (II) LoadModule: "glx"
[    35.339] (II) Loading /usr/lib/xorg/modules/extensions/libglx.so
[    35.340] (II) Module glx: vendor="X.Org Foundation"
[    35.340]    compiled for 1.21.1.1, module version = 1.0.0
[    35.340]    ABI class: X.Org Server Extension, version 10.0
[    35.340] (==) Matched nouveau as autoconfigured driver 0
[    35.340] (==) Matched nv as autoconfigured driver 1
[    35.340] (==) Matched modesetting as autoconfigured driver 2
[    35.340] (==) Matched fbdev as autoconfigured driver 3
[    35.340] (==) Matched vesa as autoconfigured driver 4
[    35.340] (==) Assigned the driver to the xf86ConfigLayout
[    35.340] (II) LoadModule: "nouveau"
[    35.341] (II) Loading /usr/lib/xorg/modules/drivers/nouveau_drv.so
[    35.341] (II) Module nouveau: vendor="X.Org Foundation"
[    35.341]    compiled for 1.21.1.1, module version = 1.0.17
[    35.341]    Module class: X.Org Video Driver
[    35.341]    ABI class: X.Org Video Driver, version 25.2
[    35.341] (II) LoadModule: "nv"
[    35.341] (WW) Warning, couldn't open module nv
[    35.341] (EE) Failed to load module "nv" (module does not exist, 0)
[    35.341] (II) LoadModule: "modesetting"
[    35.341] (II) Loading /usr/lib/xorg/modules/drivers/modesetting_drv.so
[    35.341] (II) Module modesetting: vendor="X.Org Foundation"
[    35.341]    compiled for 1.21.1.1, module version = 1.21.1
[    35.341]    Module class: X.Org Video Driver
[    35.341]    ABI class: X.Org Video Driver, version 25.2
[    35.341] (II) LoadModule: "fbdev"
[    35.341] (WW) Warning, couldn't open module fbdev
[    35.341] (EE) Failed to load module "fbdev" (module does not exist, 0)
[    35.341] (II) LoadModule: "vesa"
[    35.341] (II) Loading /usr/lib/xorg/modules/drivers/vesa_drv.so
[    35.341] (II) Module vesa: vendor="X.Org Foundation"
[    35.341]    compiled for 1.21.1.1, module version = 2.5.0
[    35.341]    Module class: X.Org Video Driver
[    35.341]    ABI class: X.Org Video Driver, version 25.2
[    35.341] (II) NOUVEAU driver
[    35.341] (II) NOUVEAU driver for NVIDIA chipset families :
[    35.341]    RIVA TNT            (NV04)
[    35.341]    RIVA TNT2           (NV05)
[    35.341]    GeForce 256         (NV10)
[    35.341]    GeForce 2           (NV11, NV15)
[    35.341]    GeForce 4MX         (NV17, NV18)
[    35.341]    GeForce 3           (NV20)
[    35.341]    GeForce 4Ti         (NV25, NV28)
[    35.342]    GeForce FX          (NV3x)
[    35.342]    GeForce 6           (NV4x)
[    35.342]    GeForce 7           (G7x)
[    35.342]    GeForce 8           (G8x)
[    35.342]    GeForce 9           (G9x)
[    35.342]    GeForce GTX 2xx/3xx (GT2xx)
[    35.342]    GeForce GTX 4xx/5xx (GFxxx)
[    35.342]    GeForce GTX 6xx/7xx (GKxxx)
[    35.342]    GeForce GTX 9xx     (GMxxx)
[    35.342]    GeForce GTX 10xx    (GPxxx)
[    35.342] (II) modesetting: Driver for Modesetting Kernel Drivers: kms
[    35.342] (II) VESA: driver for VESA chipsets: vesa
[    35.343] (EE) [drm] Failed to open DRM device for pci:0000:01:00.0: -19
[    35.343] (EE) open /dev/dri/card0: No such file or directory
[    35.343] (WW) Falling back to old probe method for modesetting
[    35.343] (EE) open /dev/dri/card0: No such file or directory
[    35.343] vesa: Refusing to run on UEFI
[    35.343] (EE) Screen 0 deleted because of no matching config section.
[    35.343] (II) UnloadModule: "modesetting"
[    35.343] (EE) Device(s) detected, but none match those in the config file.
[    35.343] (EE)
Fatal server error:
[    35.343] (EE) no screens found(EE)
[    35.343] (EE)
Please consult the The X.Org Foundation support
         at http://wiki.x.org
 for help.
[    35.343] (EE) Please also check the log file at "/var/log/Xorg.0.log" for additional information.
[    35.343] (EE)
[    35.343] (EE) Server terminated with error (1). Closing log file.

Thanks

Last edited by RottenSchnitzel (2021-12-11 21:34:02)

V1del

Forum Moderator

Registered: 2012-10-16

Posts: 23,447

Re: [SOLVED]Failed to start LightDM

Sounds like the early loading failure when KMS is not ready quick enough: https://wiki.archlinux.org/title/Kernel … _KMS_start

RottenSchnitzel

Member

Registered: 2021-12-11

Posts: 4

Re: [SOLVED]Failed to start LightDM

Sounds like the early loading failure when KMS is not ready quick enough: https://wiki.archlinux.org/title/Kernel … _KMS_start

So what would you suggest?

Last edited by RottenSchnitzel (2021-12-11 12:07:30)

V1del

Forum Moderator

Registered: 2012-10-16

Posts: 23,447

Re: [SOLVED]Failed to start LightDM

Follow the direction in that link. If you want to stay on nouveau add nouveau to the relevant modules line and rebuild your initramfs and try to boot.

You might in general also consider switching to the nvidia driver, but from the message so far this shouldn't be the inherent cause, especially if it used to work

walkingstickfan

Member

From: USA

Registered: 2021-05-10

Posts: 107

Re: [SOLVED]Failed to start LightDM

@OP: In my opinion, LightDM can be problematic and really isn't worth the eye candy. I would just boot into the command line and run startx to start your desktop. I assume that's what you were doing prior to installing LightDM. On the other hand, if you're sharing the computer(s) with other users who might be confused booting into the command line, then I can see the desire for something like LightDM.

---

Arch Linux with Openbox & Tint2

RottenSchnitzel

Member

Registered: 2021-12-11

Posts: 4

Re: [SOLVED]Failed to start LightDM

Ok so I made some progress:

After reboot the [FAILURE] message is still the same but with the following commands I was able to run it:

sudo modprobe nouveau
sudo lightdm

Seems like I have to start nouveau each time on my own which brings me back here.

Unfortunately doing this doesn't make it work:

/etc/mkinitcpio.conf:
MODULES=(nouveau)

I was never able to get the nvidia driver running so switching is not really an option.

loqs

Member

Registered: 2014-03-06

Posts: 18,137

Re: [SOLVED]Failed to start LightDM

What if you make the changes suggested in [LightDM#LightDM_does_not_appear_or_monitor_only_displays_TTY_output

RottenSchnitzel

Member

Registered: 2021-12-11

Posts: 4

Re: [SOLVED]Failed to start LightDM

What if you make the changes suggested in [LightDM#LightDM_does_not_appear_or_monitor_only_displays_TTY_output

I did this and lightdm just waited for several minutes so I knew somehow nouveau just didn't start at all. So I had a look at the modprobe configs and indeed in /usr/lib/modprobe.d/nvidia-utils.conf nouveau was blacklisted. I surely didn't write that on my own so since this error occured after doing pacman -Syu maybe I still had the nvidia driver installed (from my attempts to makenit running) and maybe it wrote that file(?).

Pretty hard to tell because I rarely shut down my computer...

Anyways I thank you all for the nice help!

Last edited by RottenSchnitzel (2021-12-11 21:29:50)

seth

Member

Registered: 2012-09-03

Posts: 59,942

Re: [SOLVED]Failed to start LightDM

modprobe -c | grep nouveau

So I had a look at the modprobe configs and indeed in /usr/lib/modprobe.d/nvidia-utils.conf nouveau was blacklisted

ninja pre-confirmed…

Please always remember to mark resolved threads by editing your initial posts subject - so others will know that there's no task left, but maybe a solution to find.
Thanks.

Last edited by seth (2021-12-11 21:32:03)

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