What does pacman -Qs linux-firmware show?
this post was submitted on 26 Jun 2025
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(Sorry for image quality) this is what I've got: 
I was hoping you had f-6 which was causing all sorts of problems for amd and intel users but you have f-9 which purports to fix them all. The next question is are you using Plasma with X11? If you are, the have a look at https://archlinux.org/news/plasma-640-will-need-manual-intervention-if-you-are-on-x11/
I am indeed using X11. I tried using Wayland ~a few months ago (on one or both of my setups, wish I could remember) and it did not work very nicely for me so I just stuck with X11, which so far has worked perfectly for what I do.
Yeah, you will need to install the X11 session as detailed in the news page I linked. To summarise sudo pacman -Syu plasma-x11-session
It's fixed!! Thank you so much!
Side note: also going to subscribe to the Arch newsletter to avoid mishaps like this in the future.
No Probs. I'm happy to help.
Probably a permissions issue somewhere. Logs will be needed.
The problem is probably unrelated to the firmware, and caused by some other upgrade.
After experiencing the issue, you should be able to switch to a different tty with ctrl-alt-f6 (or any other f key), log in, and check journalctl -b for an error message. Edit: Use the End key or shift-G to scroll to the end of the journal.
Successfully made it to a different tty with ctrl-alt-F5 and was able to run journalctl -b
I'm not entirely sure what error I'm looking for here in particular so I'm taking a guess that "Activation request for 'org.freedesktop.XYZ' failed: The systemd unit 'dbus-org.freedesktop.XYZ.service' could not be found." is the one I'm looking for (XYZ because there are a few of these such errors with just the XYZ changing between them).
Is this the same error you got?
Are you sure linux-firmware was the only thing uninstalled? What are those XYZ's? you might just need to reinstall those items.
Looks like those XYZs ended up being irrelevant to my situation (figured as much seeing as looking online didn't give me much information).
I needed to reinstall plasma-x11-session per a recent update since I still use x11.
You'll need to check the logs for your display manager, probably kdm if you're using KDE.