Black screen after log in

Issues & Assistance
1

Ok so this issue came up as soon as I installed Cachyos a couple of weeks ago. Then went away by updating the system and now is back.

When I boot my system and log in to KDE, I get a LONG black screen with a blinking cursor in the top left of the screen. Like 45ish seconds or so. Then I get to my desktop and everything appears to be working correctly. For almost exactly 1 minute everything will be fine. Then the screen goes black, and I get kicked back to log in screen. If I attempt to log in again, screen goes black, monitor goes into standby, and the whole system locks up. Makes no difference if I select Wayland or X11 sessions. If I boot into fallback mode, my system seems to work correctly. Anyone have any ideas what’s going on here or how to fix it? Really want to use Cachyos as my daily driver, but this is making it pretty difficult.

I have a 5800X3D and RTX 4090 FE.

1 Like
2

Yes, its known issue with sddm.

You can do:
CTRL + ALT + F3 and then go back to CTRL + ALT + F2

3

Thank you! I will try that the next time it acts up. I was gone over the weekend, and now it’s not doing it again. Hopefully this bug will get fixed soon!

4

I actually asked chatgpt and this helped

Disable Early KMS (Kernel Mode Setting)

Try adding amdgpu.runpm=0 to the kernel parameters to disable runtime power management:

  1. Edit GRUB:
    sudo nano /etc/default/grub

  2. Find the GRUB_CMDLINE_LINUX_DEFAULT line and add amdgpu.runpm=0:

GRUB_CMDLINE_LINUX_DEFAULT=“loglevel=3 quiet amdgpu.runpm=0”

  1. Update GRUB:

sudo grub-mkconfig -o /boot/grub/grub.cfg

  1. Reboot.

I am using dual monitor with AMD graphic and i get black screen on primary monitor, 2nd works fine, and this seems to fix it for now, maybe somebody else find this useful

5

doesnt WORK, sorry, happened again today