Second monitor not detected

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.

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

then post:

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

here are some other resources.

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