So RE: Issue 1
I'm running Raspberry Pi OS (Bookworm) 32-bit Lite.
With these commented out it works:
#dtoverlay=vc4-kms-v3d
#max_framebuffers=2
As it falls back to fbdev "legacy" mode and works fine even on Bookworm. Sadly, without any 3d acceleration and slower graphics.
So, from what you've said this isn't possible without a vc4-kms-vga666. However, I don't think this will work as dpi24 uses extra pins and it doesn't appear vga666 is a perfect subset (due to lower color depth). Unfortunately vc4-kms-dpi-generic doesn't support dpi24 either and vc4-kms-dpi-dpi24 doesn't exist.
I think to use an accelerated driver I would need a different VGA hat or to patch generic to work. I might shelve this for now as its not the main issue. Thanks for pointing me in the right direction!
Issue 2 & 3 I am still unsure about.
2) Can anyone else with other hats change resolution AFTER reboot using xrandr after adding the custom resolutions, or are we stuck on what is specific in config.txt?
3) Do resolutions 640x480 and under work?
Thanks!
I'm running Raspberry Pi OS (Bookworm) 32-bit Lite.
With these commented out it works:
#dtoverlay=vc4-kms-v3d
#max_framebuffers=2
As it falls back to fbdev "legacy" mode and works fine even on Bookworm. Sadly, without any 3d acceleration and slower graphics.
So, from what you've said this isn't possible without a vc4-kms-vga666. However, I don't think this will work as dpi24 uses extra pins and it doesn't appear vga666 is a perfect subset (due to lower color depth). Unfortunately vc4-kms-dpi-generic doesn't support dpi24 either and vc4-kms-dpi-dpi24 doesn't exist.
I think to use an accelerated driver I would need a different VGA hat or to patch generic to work. I might shelve this for now as its not the main issue. Thanks for pointing me in the right direction!
Issue 2 & 3 I am still unsure about.
2) Can anyone else with other hats change resolution AFTER reboot using xrandr after adding the custom resolutions, or are we stuck on what is specific in config.txt?
3) Do resolutions 640x480 and under work?
Thanks!
Statistics: Posted by pixelocdguy — Sat Jun 21, 2025 9:54 am