I updated Arch.
Restarted, entered encryption password, I see Grub2 boot screen, I select Arch, it says 'Starting Arch Linux...'
I see the mouse pointer for a second and then my monitor goes to sleep.
I use KDE Plasma 5.

The thing is that after my monitor goes to sleep, if I press Ctrl+Alt+Del, monitor comes on, I see the 'Starting Arch Linux' line at the top again and computer restarts. So even if the computer goes to sleep, the line is still there.

I am typing this from Kubuntu on the same computer.
I can see Arch partition and its files.

What can I do?

Thanks.

what happens if you press ctrl-alt-f2 or one of the other f-keys, windowlogo-L, or the esc key?

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I was able to login from tty5.
But I am stuck there, don't know what to do.

Video card driver not updated maybe. What grapics card to you have? what happens when you type startx after logging in? See what errors are in /var/log/Xorg.0.log

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startx : Command not found.
help : informs me that I am in gnu bash.
dir: empty

It may just be plasma. Because in the update, it updated plasma. graphic card is amd.

I have no idea how to fix plasma or video card problem. I can mount the partition from Ubuntu I guess, but I don't know how to find out the problem and how to reverse it.
I guess I can also mount it from a live usb.

Just to be clear, I have BTRFS Timehift saved on the partition itself, but I do not know how to restore it also.

When logged in on a virtual console, can you upgrade the system with pacman -Syu?

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Just you folks' wish to help solved the problem I guess.
Typing this from Arch.

I don't know what happened, but I guess logging in from the console a few times helped.

Thanks folks.

P.S: Last lines of xorg log are:

[ 299.861] (EE) event6 - Logitech Craft: client bug: event processing lagging behind by 21ms, your system is too slow
[ 312.185] (EE) event6 - Logitech Craft: client bug: event processing lagging behind by 15ms, your system is too slow
[ 514.297] (EE) client bug: timer event5 debounce: scheduled expiry is in the past (-13ms), your system is too slow
[ 514.297] (EE) client bug: timer event5 debounce short: scheduled expiry is in the past (-26ms), your system is too slow
[ 548.730] (EE) event5 - Logitech MX Ergo: client bug: event processing lagging behind by 31ms, your system is too slow
[ 548.731] (EE) client bug: timer event5 debounce: scheduled expiry is in the past (-6ms), your system is too slow
[ 548.731] (EE) client bug: timer event5 debounce short: scheduled expiry is in the past (-19ms), your system is too slow

The problem still continues.

I have to login to another tty, and type to quit X, and after that it shows me the login screen.
Last line of xorg log is
But that line could have been written after the login screen.
So, at this point, how can I solve this problem?
Thanks.