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Monitors not working. Help?

7 months ago by NoblePutty to c/linux4noobs

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Hi everyone. I'm just getting into Linux and went with Kubuntu as my first real distro. its worked pretty good out of the box and I haven't messed with it much but I'm having problems with my monitors. I have a three monitor set up using my laptop and two external monitors, they are a set of paired docking monitors from Targus connected by usb-c. it worked fine at first but then every few days they started turning off and I had to hit the button on the monitor to turn them back on and now its at the point where turning them on only connects for a couple seconds before they both say no input detected and turn off. but I've also discovered that one monitor will still work fine if i disconnect the power from the second monitor. I've tried updating to the latest nvidia driver as well as going back to a previous version but honestly i don't know if I'm even looking in the right place. I don't think the issue is the monitors because when I plug it into a windows laptop i still have access to both turn on fine. Does anyone have any advice? I'm using a Dell G16 7630 with RTX 4060.

DeltaWingDragon 2 points 7 months ago

It might still be a driver problem, with the NVIDIA drivers in general. Try booting with software rendering only, to see if that's the case.

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, and focused on Fedora.)

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NoblePutty 1 point 7 months ago

thanks but it looks like I'm using the proprietary drivers.

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DeltaWingDragon 1 point 7 months ago

Disabling those should be similar. Search for NVIDIA in the driver name, and use the same process.

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