Re: [9fans] cmdline.txt for RPi 4 with QHD screen

[adventures in9 <adventuresin9@gmail.com>]

I had similar issues when I needed a rpi3 to be forced into running
720p into a video capture device.

These used to be handled in config.txt
It looks like they moved those setting into a legacy section;
https://www.raspberrypi.com/documentation/computers/legacy_config_txt.html#legacy-video-options

I remember it taking several tries of different combinations of group
and mode before finding one that worked.

On Thu, Apr 4, 2024 at 9:36 PM <taylor.garry@gmail.com> wrote:
>
> Thanks for the quick reply, I put in the hdmi_enable_4k line and no difference.
>
> My cmdline.txt is:
>
> console=0 user=glenda nobootprompt=local!/dev/sdM0/fs
> hdmi_group=2
> hdmi_mode=82
> hdmi_enable_4kp60=1
> hdmi_cvt=2560 1440 60 3 0 0 1
> max_framebuffer_width=2560
> max_framebuffer_height=1440
> hdmi_pixel_freq_limit=400000000
> vgasize=2560x1440x16
>
> It just seems like nothing I do really seems to make much difference.
>
> Cheers
>
> Garry
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