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2nd monitor not recognized on initial boot (slrpnk.net)

submitted 6 days ago by [email protected] to c/[email protected]

3 comments fedilink hide all child comments

I've noticed that my secondary monitor usually doesn't turn on initially. In order to get it to turn on, I can do a restart after the initial boot and then it will turn on. Any idea what might be causing this or how to fix it? The monitor is hooked up through the laptop's hdmi port.

Fedora 42

KDE Plasma

Wayland

Nvidia RTX 4070

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[–] DeltaWingDragon 2 points 6 days ago (1 children)

I think it's something with the monitor's firmware.

Does the monitor have its own power button? Does it disconnect the power flow completely?
If it doesn't, it could be the monitor's firmware misbehaving, thinking the button was pressed when it wasn't.
When you shut down your computer, see if the monitor turns off as well, or if it stays on and says "No Signal".
Also, test it with another computer.

Another possibility is with the GPU. Try disabling it temporarily, and booting with only software rendering.

[–] [email protected] 2 points 6 days ago (1 children)

It does have it's own power button. When shutting down, the monitor does stay on for a few seconds with the 'no signal' message, but then turns off (the LED power indicator goes from blue to orange).

I don't have another computer to test it with at the moment.

I can try booting with just the software rendering, but I'm not sure how to do this in Fedora. In Pop os, there were options under the power menu to choose graphics settings. Fedora seems to handle this automatically(?)

[–] DeltaWingDragon 1 points 3 days ago

Here's how to disable the GPU drivers:

Remove “nomodeset” from the GRUB_CMDLINE_LINUX variable in /etc/default/grub

Add “rd.driver.blacklist=nouveau modprobe.blacklist=nouveau” to GRUB_CMDLINE_LINUX instead

Run sudo update-grub then reboot

Note: This only works if you're using the open-source drivers, known as Nouveau. If you're using the proprietary drivers, this will not work.

To check if you're using Nouveau or the proprietary drivers, run lspci and check for "NVIDIA", then run lsmod and check for Nouveau.

Remember to change it back when you want to re-enable the NVIDIA drivers.

(PS: I used this website as a source, their procedure is more complicated.)