Second monitor not detected

[ultra99]

Specs:
AMD Ryzen 2500U cpu with Vega 8 gfx.
2x 27" ThinkVision P27h monitors, daisy-chained with DP and main monitor connected to the laptop via HDMI. Of course, I’ve set the signal source of main monitor to HDMI, which works, and the 2nd monitor source is DP, doesn’t work.

This used to work with other distros, so I don’t know what am I doing wrong.

[dglt]

you need to post relevant info if you need help, read this:

How to provide good information in your posts

When asking questions in the forum, it would be most helpful to all members if you provide some basic information. When you provide info from the terminal, usually from your logs, you have to format it so the content is easy to read. First copy and paste your text/terminal/code into the post Then select the text/code and click the post edit toolbar button </> . Another handy way is to use 3 backticks ` at the start and 3 more at the end of the text like this: ``` Paste text or code here …

then post:

inxi -FGxxxz
xrandr
mhwd -li
grep -v ^# /etc/X11/xorg.conf.d/*.conf
grep -v ^# /etc/X11/mhwd.d/*.conf

here are some other resources.
https://wiki.archlinux.org/index.php/Xrandr
https://wiki.archlinux.org/index.php/Xorg