So you get to the login screen, and login with your password, and it just shows this?
What if you press CTRL+ALT+F3?
With this key combination I was able to enter the tty.
Great.
Can you give me the output of:
systemctl status lightdm
and
journalctl -xe
But immediately after that it showed again brcmfmac: power management disabled
Thanks.
Can you try running:
sudo systemctl start lightdm
And then again (assuming it fails) check
journalctl -xe
There are more than 6000 lines so I included only last part. 
Seems like an Xorg dump.
Okay so what do you suggest me to do now?
The problem is resolved in this thread. You need to downgrade mesa or install the updated mesa-git.
2 Likes
Thanks, I’ll try it tomorrow.
Same problems to me after update
I have the same issue.
I used stevenfalco's command to fix it.
Namely:
pacman -Suy mesa-git
and answered y to the prompt to remove mesa as shown here:
[x@x ~]$ sudo pacman -Suy mesa-git
:: Synchronizing package databases...
core 218.3 KiB 286 KiB/s 00:01 [#########################################] 100%
extra 2.4 MiB 1236 KiB/s 00:02 [#########################################] 100%
community 5.3 MiB 2.99 MiB/s 00:02 [#########################################] 100%
:: Starting full system upgrade...
resolving dependencies...
looking for conflicting packages...
:: mesa-git and mesa are in conflict. Remove mesa? [y/N] y
Package (3) Old Version New Version Net Change Download Size
extra/libclc 0.2.0+589+9aa6f35-1 57.42 MiB 6.77 MiB
mesa 19.3.2-1 -39.75 MiB
extra/mesa-git 20.0.0_devel.118876.645b1953-1 429.42 MiB 10.08 MiB
Total Download Size: 16.84 MiB
Total Installed Size: 486.84 MiB
Net Upgrade Size: 447.09 MiB
:: Proceed with installation? [Y/n]
:: Retrieving packages...
libclc-0.2.0+589+9aa6f35-1-any 6.8 MiB 1919 KiB/s 00:04 [#########################################] 100%
mesa-git-20.0.0_devel.118876.645b1953-1... 10.1 MiB 5.76 MiB/s 00:02 [#########################################] 100%
(2/2) checking keys in keyring [#########################################] 100%
(2/2) checking package integrity [#########################################] 100%
(2/2) loading package files [#########################################] 100%
(2/2) checking for file conflicts [#########################################] 100%
(3/3) checking available disk space [#########################################] 100%
:: Processing package changes...
(1/1) removing mesa [#########################################] 100%
(1/2) installing libclc [#########################################] 100%
(2/2) installing mesa-git [#########################################] 100%
Optional dependencies for mesa-git
opengl-man-pages: for the OpenGL API man pages
:: Running post-transaction hooks...
(1/1) Arming ConditionNeedsUpdate...
[x@x ~]$ reboot
Thanks for the help!
Now that "stable mesa" has been fixed, you might want to switch from the mesa-git back to stable mesa:
pacman -Suy mesa
The above command will replace mesa-git with mesa 19.3.2-2 (or later).
4 Likes
Thanks.
I also noticed that there are optional dependencies for Mesa which are described as "for accelerated video playback" namely mesa-vdpau and libva-mesa-driver.
Does it make sense to install them on RPi4?
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