Not really a problem, since my system is WORKING, but something I’d like to address and know.
Have a system running the latest Tumbleweed, nVidia drivers installed via repositories correctly, and everything working. Hardware in question is an nVidia GTX-1080 connected to a widescreen monitor via HDMI. HDMI is providing sound also, and that too is working.
The question is, in Windows 11 on the exact same system (dual booting, different hard drives), I can get a resolution of 3620x1527. But on Linux/KDE (Wayland) I can only get 2560x1080.
The graphics driver relies on the monitor’s EDID and the modes it exposes. Have a look at what kscreen-doctor -o reports for a given monitor connection.
Windows may be taking advantage of reading EDID extension blocks and parsing these to determine more aggressive display modes…
FWIW, here’s an interesting NVIDIA discussion concerning Linux…
Based on your comments about Windows, you could download and install a tool called Custom Resolution Utility (CRU) to examine the monitor’s EDID and its advertised modes. Select your active widescreen monitor and export the settings, saving it as “monitor.bin”.
From reading this page it seems you may be able to add custom modes as required and save as the resulting EDID file. I have not tested this so you’ll need to try this for yourself.
In openSUSE TW, you would create a directory sudo mkdir -p /usr/lib/firmware/edid and place monitor.bin there.
You would edit your GRUB boot parameters to include drm.edid_firmware=HDMI-A-1:edid/monitor.bin (using the actual interface name for your monitor connection). Once done, reboot and see if the desired display mode is now available via System Settings or kscreen-doctor -o.
Many thanks to you both. Had no idea about kscreen-doctor, but running it did show me the resolutions available. Oddly, the higher resolution wasn’t listed at all. Not sure why Windows would let me select that.
Going to go parse through those articles, good reading. I may try to finagle things to get that resolution, but this was more of a puzzle than anything else.