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Re: Failure to use 3840x2160 30hz with Intel 620 chipset

Pierre Couderc composed on 2021-07-10 23:07 (UTC+0200):
> see : https://paste.debian.net/1203999/
> for( .local/share/xorg/Xorg.0.log)
What does xrandr -q report booted this way?

https://wiki.archlinux.org/title/Backlight may warrant a read.

I have to suspect acpi_backlight=vendor on kernel command line is not taken
well by the 3840x2160 screen.

Whatever caused [ 313.732] (WW) modeset(0): Option "PreferredMode" is not used
I can't tell.

> https://paste.debian.net/plain/1204000

[ 870.193] (EE) modeset(0): failed to set mode: Invalid argument appears multiple times quite some lines after these:
[   869.149] (II) modeset(0): Using user preference for initial modes
[   869.149] (II) modeset(0): Output eDP-1 using initial mode 1920x1080 +0+0
[   869.149] (II) modeset(0): Output HDMI-1 using initial mode 3840x2160_30.00 +0+0

The last line indicates the screens overlap instead of side by side placement. It
should end +1920+0 if everything else is OK, which pretty much explains absence of
4k screen output.

Have you tried booting with a clean kernel command line, e.g. without
acpi_backlight=vendor in particular?

Likely dmesg and journal need to be explored to find a reason for the invalid
argument errors. Adding drm.debug=0x1e & log_buf_len=1M to kernel command line
may be needed to help diagnosis.

I only had a 4K display for 3 weeks 3 years ago, so it's hard for me to be very
helpful by trying to match behavior, or construct a configuration file free of
Evolution as taught in public schools is, like religion,
	based on faith, not based on science.

 Team OS/2 ** Reg. Linux User #211409 ** a11y rocks!

Felix Miata

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