Re: [9fans] No signal on some monitors with Raspberry Pi 400

[Richard Miller <9fans@hamnavoe.com>]

> That is, if I plug into a ~10 year old Vizio television
> everything works fine at a reasonable resolution (1280x1024?  I haven't yet figured
> out which utility to use to query display properties)

Here's a simple way:

term% echo `{dd -if /dev/screen -bs 64 -count 1}

> , but if I plug it into a Dell
> S2817Q the monitor says "No signal detected."

That's a 4k monitor, I think. The native resolution is probably too big
to fit in the virtual area allowed for the kernel frame buffer. (Lack of
foresight - monitors were smaller when 9pi was first done.)

I'll see about fixing that soon. Meanwhile, you should be able to use
hdmi_group and hdmi_mode settings in config.txt to request a lower resolution.
Or add something like "vgasize=1600x1200x16" to the command line in cmdline.txt -
either method should work.


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