LE 10 beta for i4 force hdmi resolution

vasonline · August 25, 2021 at 9:16 PM

I am using my pi 4 to drive my retro-crt TV

I have the following in config.txt to enforce a 576i resolution.

The setting is ignored by LE. It just switches to a resolution it has found with the edid from the hdmi <-> vga/rgb converter.

The crt TV is not happy with a HDresolution

Is this a bug in LE10 or did I overlook something (/lol me stupid)

Only the "rainbow" boot screen is displayed in 576i.

hdmi_group=1

hdmi_mode=22

hdmi_ignore_edid=0xa5000080

**chewitt** · August 25, 2021 at 11:25 PM Official Post

Do you get CVBS output if you disconnect the HDMI/VGA device? .. the hdmi_group/mode/ignore_edid settings no longer work in LE10, the kernel DRM subsystem manages output now (same as all our other devices).

vasonline · August 26, 2021 at 7:48 AM

Hi Chewitt,

Thanks for the reply.

I use the HDMI port with a HDMI -> VGA/RGB sync convertor to drive the CRT directly with a proper RGB signal.

I do not want to use the (crappy) CVBS output.

How do you enforce the resolution in LE10 with pi4 ?

**HiassofT** · August 26, 2021 at 9:37 AM

Try adding video=HDMI-A-1:720x576@50iD to the end of cmdline.txt (after "quiet", in the same line).

so long,

Hias

vasonline · August 26, 2021 at 10:25 AM

Hi Hiassoft

Thank you for your reply.

Added to cmdline.txt

You would say it works, however

There seems something wrong with interlaced modes coming from the PI4

anyone with a pi 4 wants to test that?

Selecting 576p in Kodi settings -> works.

Selecting 576i in Kodi settings -> garbage pixelated.

Selecting 480p in Kodi settings -> works.

Selecting 480i in Kodi settings-> garbage pixelated.

Please see attached pictures showing 576i pixellated and 576p normal.

Please understand that it _need_ interlaced. Otherwise the retro CRT TV doesn't like it.

Also it's the wrong aspect ratio. I want 16:9, not 4:3

( difficult me)

Here is a photo I took on a recent-ish lcd tv to illustratie the picture quality problem.

The retro crt will not want to give a meaningfull picture with this garbage PQ.

**HiassofT** · August 26, 2021 at 12:40 PM

Please post the outputs of pastekodi and modetest | pastebinit

so long,

Hias

vasonline · August 26, 2021 at 1:04 PM

Hi HiassofT,

Thank you for your reply.

Here is the output of both commands:

LibreELEC:~ # pastekodi

http://ix.io/3x0H

LibreELEC:~ # modetest | pastebinit

http://ix.io/3x0I

LibreELEC:~ #

**Klojum** · August 26, 2021 at 2:29 PM Official Post

@vasonline

Is you computer stuttering..?

Replying once will do just fine.

**Klojum** · August 26, 2021 at 2:46 PM Official Post

Never mind... Cloudflare is having some brainfarts.

**HiassofT** · August 26, 2021 at 4:06 PM

Thanks for the info!

I could reproduce the pixelated output issue here and pinged the RPi devs - it looks though as 480i/576i output via HDMI always had this issue on RPi4.

so long,

Hias

vasonline · August 26, 2021 at 8:51 PM

Hi HiassofT,

Thanks for confirming the problem.

If there is anything that I can help to test, please let me know.

**popcornmix** · September 14, 2021 at 6:39 PM

This issue should be fixed with latest firmware.

vasonline · November 18, 2021 at 8:59 AM

Hi,

I updated the RPi4 to the latest release (10.0.1 / 2021.11)

Is it possible the fix is not yet included?

480i and 576i modes are still pixelated. (no change in behavior)

Mayby I am doing something wrong/forget something?

Want to test/confirm?

Greetings/tx

**HiassofT** · November 18, 2021 at 4:05 PM

The fix for the kms driver is still missing, so this is expected.

so long,

Hias

vasonline · March 29, 2023 at 9:31 PM

Confirm FIXED pixellation problem!

Thanks everyone involved for the help!

This with libreelec 11 on RPI4.

Just one humble question:

- How can I set the 16:9 aspect ratio in 576i video mode?

Because see screenshot, there are two 576i aspect ratio's.

(16:9 and 4:3)

The CRT is 16:9, It defaults to 4:3. 4:3 default is okay

for me, but how to change it?

- Tried playing with the picture calibration. Some GUI elements are still stretched. Ok for the video.

It's HDMI mode 22 instead of 21.

**HiassofT** · March 29, 2023 at 9:59 PM

You have to manually switch your CRT to 16:9 mode and use video calibration in kodi to compensate for the stretched / anamorphic display mode.

so long,

Hias

vasonline · April 3, 2023 at 8:32 PM

Hi Hias,

That worked out quite Okay. Got a good 4:3 anamorphic picture. Set TV to Wide, and it is Okay.

Case closed!

I did find a minor issue elsewhere. Will make a new topic for that.