Arch Linux

DaysSky

Member

Registered: 2022-12-30

Posts: 35

Lightdm - error reading existing xauthority

When i boot into my system, it stops at a blank screen with flicking cursor. When i run

lightdm --test-mode --debug

It returns error reading xauthority : failed to open file ?/run/lightdm/root/ :0 : permission denied

I do not know how to copy or upload logs with my terminal, so if you can also tell me it would be greatly appreciated.

seth

Member

From: Won't reply 2 private help req

Registered: 2012-09-03

Posts: 76,403

Re: Lightdm - error reading existing xauthority

lightdm --test-mode --debug

On the console?

https://wiki.archlinux.org/title/LightD … n_flashing
https://wiki.archlinux.org/title/LightD … TTY_output

I do not know how to copy or upload logs with my terminal

1st link below, lightdm log is in /var/log

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DaysSky

Member

Registered: 2022-12-30

Posts: 35

Re: Lightdm - error reading existing xauthority

lightdm --test-mode --debug

On the console?

https://wiki.archlinux.org/title/LightD … n_flashing
https://wiki.archlinux.org/title/LightD … TTY_output

I do not know how to copy or upload logs with my terminal

1st link below, lightdm log is in /var/log

On tty
http://ix.io/4nLu

Last edited by DaysSky (2023-02-11 16:56:50)

seth

Member

From: Won't reply 2 private help req

Registered: 2012-09-03

Posts: 76,403

Re: Lightdm - error reading existing xauthority

[+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

Check your lightdm conf, in doubt post it.

Running the test-mode on the tty will likely not be possible.

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DaysSky

Member

Registered: 2022-12-30

Posts: 35

Re: Lightdm - error reading existing xauthority

[+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

Check your lightdm conf, in doubt post it.

Running the test-mode on the tty will likely not be possible.

http://ix.io/27Wv

seth

Member

From: Won't reply 2 private help req

Registered: 2012-09-03

Posts: 76,403

Re: Lightdm - error reading existing xauthority

Boring, and it's indeed X11

[+0.00s] DEBUG: Launching process 678: /usr/bin/X :0 -seat seat0 -auth /run/lightdm/root/:0 -nolisten tcp vt7 -novtswitch
…
[+0.02s] DEBUG: Process 678 exited with return value 1

So please post your Xorg log, https://wiki.archlinux.org/title/Xorg#General

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DaysSky

Member

Registered: 2022-12-30

Posts: 35

Re: Lightdm - error reading existing xauthority

Boring, and it's indeed X11

[+0.00s] DEBUG: Launching process 678: /usr/bin/X :0 -seat seat0 -auth /run/lightdm/root/:0 -nolisten tcp vt7 -novtswitch
…
[+0.02s] DEBUG: Process 678 exited with return value 1

So please post your Xorg log, https://wiki.archlinux.org/title/Xorg#General

http://ix.io/4nLy

seth

Member

From: Won't reply 2 private help req

Registered: 2012-09-03

Posts: 76,403

Re: Lightdm - error reading existing xauthority

Did you also look at it?

[     5.901] (EE) Screen 0 deleted because of no matching config section.
[     5.901] (II) UnloadModule: "modesetting"
[     5.901] (EE) Device(s) detected, but none match those in the config file.
[     5.901] (EE) 
Fatal server error:
[     5.901] (EE) no screens found(EE) 
[     5.901] (EE) 

It's a hybrid system, you're running on the AMD chip, but the nvidia chip is preferred and somehow misconfigured.
You need to elaborate on your configuration.

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DaysSky

Member

Registered: 2022-12-30

Posts: 35

Re: Lightdm - error reading existing xauthority

Did you also look at it?

[     5.901] (EE) Screen 0 deleted because of no matching config section.
[     5.901] (II) UnloadModule: "modesetting"
[     5.901] (EE) Device(s) detected, but none match those in the config file.
[     5.901] (EE) 
Fatal server error:
[     5.901] (EE) no screens found(EE) 
[     5.901] (EE) 

It's a hybrid system, you're running on the AMD chip, but the nvidia chip is preferred and somehow misconfigured.
You need to elaborate on your configuration.

So what do i need to do?

seth

Member

From: Won't reply 2 private help req

Registered: 2012-09-03

Posts: 76,403

Re: Lightdm - error reading existing xauthority

You need to elaborate on your configuration.

How did you intend to configure the system and what did you actually do?

Post your complete system journal for the boot:

sudo journalctl -b | curl -F 'file=@-' 0x0.st

Also

ls /{etc,usr/share}/X11/xorg.conf*

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DaysSky

Member

Registered: 2022-12-30

Posts: 35

Re: Lightdm - error reading existing xauthority

You need to elaborate on your configuration.

How did you intend to configure the system and what did you actually do?

Post your complete system journal for the boot:

sudo journalctl -b | curl -F 'file=@-' 0x0.st

Also

ls /{etc,usr/share}/X11/xorg.conf*

http://0x0.st/Hrcf.txt
10-nvidia-drm-outputclass.conf
10-quirks.conf
40ibinput.conf
I tried to make my system recognize my nvidia card

seth

Member

From: Won't reply 2 private help req

Registered: 2012-09-03

Posts: 76,403

Re: Lightdm - error reading existing xauthority

I tried to make my system recognize my nvidia card

How? Did you blacklist the amdgpu module?
Don't.

https://wiki.archlinux.org/title/PRIME

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DaysSky

Member

Registered: 2022-12-30

Posts: 35

Re: Lightdm - error reading existing xauthority

I tried to make my system recognize my nvidia card

How? Did you blacklist the amdgpu module?
Don't.

https://wiki.archlinux.org/title/PRIME

Yes.
How do i fix my system?

seth

Member

From: Won't reply 2 private help req

Registered: 2012-09-03

Posts: 76,403

Re: Lightdm - error reading existing xauthority

Did you blacklist the amdgpu module?
Don't.

Next time you start out by "I blacklisted the amdgpu module and now my graphical target fails", because that could have us spared this game of 20 questions.

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How to upload text · How to boot w/o GUI · Disable Windows Fast-Start! · Fix your xinitrc

DaysSky

Member

Registered: 2022-12-30

Posts: 35

Re: Lightdm - error reading existing xauthority

Did you blacklist the amdgpu module?
Don't.

Next time you start out by "I blacklisted the amdgpu module and now my graphical target fails", because that could have us spared this game of 20 questions.

i will make sure to do that, thank you

DaysSky

Member

Registered: 2022-12-30

Posts: 35

Re: Lightdm - error reading existing xauthority

I tried to make my system recognize my nvidia card

How? Did you blacklist the amdgpu module?
Don't.

https://wiki.archlinux.org/title/PRIME

I un blacklisted it by doing sudo rm /etc/modprobe.d/amdgpu.conf but it still does not work
http://0x0.st/HrcJ.txt

Last edited by DaysSky (2023-02-11 17:39:35)

seth

Member

From: Won't reply 2 private help req

Registered: 2012-09-03

Posts: 76,403

Re: Lightdm - error reading existing xauthority

The amdgpu module isn't loaded, so it's still blacklisted.
You probably picked up /etc/modprobe.d/amdgpu.conf in the initrramfs via the modconf hook.
=> rebuild the initramfs.

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