LinuxQuestions.org - Why can't I change monitor resolution without freezing up OS?

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Why can't I change monitor resolution without freezing up OS?

Loaded Mageia 8. Yeah. Actually have a 4K monitor. Wow. Problem: We can't reduce the resolution without the entire OS going to the 'No irq handler for vector' screen after reboot and staying there. When we've tried to adjust resolution when appropriate during complete reload of OS, it freezes once trying to login. (3840x2160 is auto resolution; the font, etc. on the display is way too small.)

We've gone with the highlighted default (volcanic and later) with the graphical server (amdgpu). When it has frozen, we tried to use the drakx11, but we can't seem to get it to work (or choose the right resolution?).

Please help. Thank you.

The main search for this site gives me an error, and I did some searches online with varying results. I chose the find similar threads button, but the only one that might be okay, if very confusing is https://www.linuxquestions.org/quest...onitor-155054/.

Monitor 4k LG UHD
Asus B550-F MB
G-Skill DDR4 3200 32 GB Memory
AMD Ryzen 3800x CPU
Asrock RX 5500 XT
2 - 2 TB Seagate HDD
DVD drive
Mageia 8 OS

The command to change resolution is

Code:

xrandr --output DisplayPort-0 --mode 000x000

with 000x000 replaced by the appropriate setting. You could try setting that from a script at start-up.

Look at the outputs of

Code:

xrandr

lspci -k

xdpyinfo | grep 'dimensions:'

lshw -short -class display

inxi -G

Quote:

(3840x2160 is auto resolution; the font, etc. on the display is way too small.)

Increase the dpi, until you like it.

Code:

startx -- -dpi 200