Black screen with mouse after last update

[Paul11]

Hello, please help me with black screen problem (after update two days ago). I can start command line (Ctrl+Alt+F2) and tried some advices from topics. For example, brahma posts (can’t insert links there) with sudo rm /etc/X11/mhwd.d/vesa.conf → sudo mhwd -r pci video-vesa → sudo mhwd -r pci video-modesetting. Also tried to reinstall SSDM / plasma, update from mirrors, don’t help I am very new in Manjaro…

[brahma]

do you have dual graphics? nvidia+intel/amd?

[Paul11]

I have HUAWEI MateBook 16 CurieM-WFD9AW, so graphic card is AMD Radeon Graphics. Command “lspci | grep VGA” output is
VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Cezanne (rev c5)

[brahma]

so whats the output from:
mhwd-kernel -li

[Paul11]

5.15.49-1-MANJARO (linux515)

[brahma]

so only one kernel, and output from:
mhwd -li
edit:
if it only shows video-linux, reinstall it:
uninstall it:
sudo mhwd -r pci video-linux
install it again:
sudo mhwd -i pci video-linux
reboot:
systemctl reboot

[Paul11]

Yes, it was only video-linux, i did reinstall, but it did not help.

[brahma]

and type this:
startx

[Paul11]

It was a few lines of output with timeouts:
xauth: home/pavel/.Xauthority not writable, changes will be ignored
xauth: timeout in locking authority file /home/pavel/.Xauthority

then some info, for example:
X. Org X server 1.21.1.3
X Prorocol Version 11, Revision 8
…

and in the end:
xinit: server error

[brahma]

so remove the xauthority file:
rm /home/pavel/.Xauthority
reboot:
systemctl reboot

[Paul11]

Yes!!! Display works! brahma, you are the the great sage
Thank you very!
Tell please what what the cause of it? Why system updates may be so inconsistent?

[brahma]

reboot again, and see if the issue is resolved…
the xauthority file got somehow messed up… it sometimes happens…

[Paul11]

Aftrer reboot all OK. That day when the black screen appears, i added my user to roots (in sudoers and in passwd files) and removed after a while. This couldn’t relate to problem (maybe since that Xauthority becomes not writable) ?

[brahma]

this is very likely why it happened…

[Paul11]

Advise please how to safely add to my user root rights. Or this is not good idea at all?

[brahma]

that i dont know how to do it … you can create a post here on forum on how to do it

[Paul11]

Ok, thank you