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Advanced users • RPi 3B w/Bookworm + non-standard display

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I have a 1920x1280 monitor (Amazon: B0DPX4CWK3) connected to a RPi 3B. I installed the latest RPi OS 64-bit Bookworm. The display works, but the screen resolution is set for 1920x1080, so it is stretched vertically.

get-edid + edid-decode verify the display's native resolution:

Code:

...  Detailed Timing Descriptors:    DTD 1:  1920x1280   60.000000 Hz   3:2     79.500 kHz    165.360000 MHz (222 mm x 148 mm)                 Hfront   48 Hsync  32 Hback   80 Hpol P                 Vfront    4 Vsync   5 Vback   36 Vpol P...
I checked the following, but 1920x1080 is the largest resolution listed:
  • Raspberry | Preferences | Screen Configuration | Screens | HDMI-A-1 | Resolution
  • wlr-randr
  • raspinfo
If I use wlr-randr --output HDMI-A-1 --custom-mode 1920x1280@60, I get "failed to apply configuration"

Adding the following to the bottom of /boot/firmware/config.txt didn't work:

Code:

hdmi_group=2hdmi_mode=87hdmi_cvt=1920 1280 60
Hmm. After doing some other configuration, this time with the command line raspi-config, it looks l can now find ~/.config/wayfire.ini. Unfortunately, adding the following didn't make any difference:

Code:

[output:HDMI-A-1]mode = 1920x1280@60000position = 0,0transform = normalscale = 1.000000
Also, I saw reference to kanshi and changed the ~/.config/kanshi/config to the below, but that didn't work either:

Code:

profile {output HDMI-A-1 enable mode 1920x1280@60.000 position 0,0 transform normal}
How do I get a mode matching the native resolution of this display to be created, available, & used persistently (preferably, unless another display is connected) under Raspberry Pi OS (64-bit) Bookworm on a RPi 3B (or 3B+)?

Thanks,
Rick

Statistics: Posted by rtillery — Sun Mar 09, 2025 4:18 am — Replies 4 — Views 109



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