Pbp not working properly in f43; worked in f42

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My monitor is a Samsung U28E590D; I have been using it with both a personal Fedora 43 PC and a work W11 laptop; using the PBP (picture-by-picture) feature, I got the Fedora screen on the left and the Windows screen on the right.

Under F42, both virtual displays automagically used all the available space; both at 1920 x 2160 (the full resolution is 3840 x 2160).

After updating to F43, I get only 1920 x 1080 for the Linux screen; I still get 1920 x 2160 for the Windows screen.

How do I convince F43 to give me 1920 x 2160 for the Fedora portion of my monitor?

Thanks!

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Thanks!

But it looks like I’m out of luck. The /usr/share/ddccontrol-db/monitor/SAM\* files do not seem to include my monitor.

I’m looking at ddcutil, but the documentation isn’t very friendly to noobies – and I’ve only rarely had to fiddle with rules.

ddcutil detect
Invalid display
I2C bus: /dev/i2c-15
DRM_connector: card1-HDMI-A-5
EDID synopsis:
Mfg id: SAM - Samsung Electric Company
Model: U28E590
Product code: 3148 (0x0c4c)
Serial number: HTPK301606
Binary serial number: 810373962 (0x304d534a)
Manufacture year: 2018, Week: 11
DDC communication failed

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