RPi4 on VGA CRT: Picture is shifted off-screen to the left about 1/8 of the screen width using an HDMI to VGA converter on a CRT monitor.

[qbancoffee]

I was asked to post this under "raspberrypi/firmware" but I'm no longer convinced this is a firmware issue. Here is the link https://github.com/raspberrypi/firmware/issues/1396

Description: After the udev kernel device manager is started, all Raspbian based Os's shift the picture left about 1/8 of the screen width off-screen. Before that, the rainbow splash screens displays correctly and the four raspberry's display correctly. Ubuntu 20.04 64 bit for the Raspberry pi 4 boots and runs correctly, no display issues.

Configuration:

• Raspberry pi 4/4GB Ram
• 4 GB sdcard
• Raspian Lite released 2020-02-13 (burned with raspberry pi imager)
• 1024x768 75Hz Homebrew CRT VGA monitor (Works correctly with Raspian RPi4 on VGA CRT: Picture is shifted off-screen to the left about 1/8 of the screen width using an HDMI to VGA converter on a CRT monitoron a Raspberry pi3, x86 linux, windows XP,7 and 10, OS9, OSX and several other os's )
• HDMI to VGA adapater (tested with several different brands)
• Modified config.txt and added the following

hdmi_group=2
hdmi_mode=18

I have tested with all of the available Raspian images from the "Raspberry Pi Imager" and downloaded and installed RetroPie with the same results. All Raspian based OS's behave the same way but Ubuntu behaves correctly.

I think this is a moderate bug as many people including myself would like to do retro gaming on CRT monitors.

Videos demonstrating bug and Ubuntu working correctly:

• First boot with Raspian Lite
• Running raspi-config
• Image shifts when udev kernel device manager is started
• Ubuntu 20.04 booting correctly on raspberry pi4

[rbalykov]

1) run anything that will fill console with something non-black (nano, mc, whatever) 2) press "auto" on your monitor

[qbancoffee]

This monitor doesn't have an "auto" feature but I can adjust it manually to center the image. There is something a little off in raspian because at power on, the rainbow splash screen shows correctly and the four raspberries show correctly. it's only after the udev kernel device manager loads that the display gets shifted towards the left. If I adjust the monitor settings manually, the image will be centered after booting but the raspberries and the rainbow splash screen will be shifted towards the right.

Ubuntu 20.04 has no issues at all, everything works as expected so this is some evidence that there is a problem in Raspian.