Re: Forcing display size on Pi4

> I have a 2K display that Plan9 forces to 1920x1080 resolution.
> Poking around 9/bcm/screen.c indicates that setting vgasize=WxHxD
> should force the size, but adding a suitable entry in cmdline.txt
> just gives me a blank display.
> 
> Before I dig deeper, is this expected to work?

Possibly not.  I haven't tried vgasize= for years and there have been a
lot of changes to the firmware & videocore mailbox interface since then.

Plan 9 should accept whatever resolution comes from the gpu, so it
may be the firmware which "forces" 1920x1080.  Maybe gpu_mem needs
to be bigger than the usual 16, or some other config.txt adjustment
is needed?


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