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Re: How can I force a particular startup hdmi mode on Raspian/Buster?

From	Gary Dale <gary@extremeground.com>
Newsgroups	linux.debian.user
Subject	Re: How can I force a particular startup hdmi mode on Raspian/Buster?
Date	2019-07-31 03:20 +0200
Message-ID	<ypLrz-2W7-3@gated-at.bofh.it> (permalink)
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On 2019-07-30 6:51 p.m., Cousin Stanley wrote:
> Gary Dale wrote:
>
>> Unfortunately none of those options are 1080i.
>>
>> I've tried all of the 1920x1080
>> and they all end up being progressive scan.
>>
>    Running raspbian here on a rpi3b+
>    currently using a 22in LG hdmi monitor.
>
>    screen resolution is 1920x1080 @ 96dpi
>
>    The raspi-config resolution menu
>    offers 2 1920x1080 options ....
>
>      CEA mode 16 1920x1080 60Hz 16:9
>
>      CEA mode 31 1920x1980 50Hz 16:10
>
>    I  don't  remember using these options myself
>    when I first set it up, but that doesn't mean
>    that I didn't ....
>
>    In 10 days I'll be 73 years old
>    and the wet-ware memory
>    ain't what it used to be .... :-)
>
>    I've also used a Philips 43in TV hdmi port
>    with this particular rpi3b+ and do recall
>    an odd occasional prompt about screen res
>    that would resolve itself with an OK click
>    but otherwise display was fine.
>
I'm not that much younger than you but different TVs can have different 
issues. Mine's a Panasonic 42" Plasma. The issue isn't getting a prompt 
about screen resolution but rather about getting anything to display.

In your case CEA modes 16 & 31 are 1080p. Mode 16 is 60Hz while 31 is 
50Hz. Since Philips is a European brand, it probably has no trouble with 
either frequency.

Left to its own devices, my Pi4B will end up in 640x480. When I let it 
default, all I get are 640x480 and 720x480 resolution options. By adding 
a lot of lines to /boot/config.txt, I can get it to go into a 1920x1080p 
mode that my TV can't sync to. However I can use VNC or SSH to the 
desktop and open a terminal to set it to CEA mode 5, which is 1080i.

At that point, I can see a long list of DMT modes, which are progressive 
scan so far as I can see.

This is one of my biggest complaints about the people who design these 
things: 1080i is an international broadcast standard. Every device 
intended to potentially output to an HDTV should be able to handle 1080i 
automatically. It shouldn't be left to the device user to struggle to 
get it to work.

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Thread

How can I force a particular startup hdmi mode on Raspian/Buster? Gary Dale <gary@extremeground.com> - 2019-07-30 18:50 +0200
  Re: How can I force a particular startup hdmi mode on Raspian/Buster? Judah Richardson <judahrichardson@gmail.com> - 2019-07-30 19:20 +0200
  Re: How can I force a particular startup hdmi mode on Raspian/Buster? Cousin Stanley <cousinstanley@gmail.com> - 2019-07-30 23:10 +0200
    Re: How can I force a particular startup hdmi mode on Raspian/Buster? Gary Dale <gary@extremeground.com> - 2019-07-30 23:20 +0200
      Re: How can I force a particular startup hdmi mode on Raspian/Buster? Cousin Stanley <cousinstanley@gmail.com> - 2019-07-31 01:20 +0200
        Re: How can I force a particular startup hdmi mode on Raspian/Buster? Gary Dale <gary@extremeground.com> - 2019-07-31 03:20 +0200

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