Pierre Couderc composed on 2021-07-08 22:42 (UTC+0200):
> I have a problem when trying a 4K display with Acer swift5. They say
> that 3840x2160 30hz is supported...
> When I try (under bullseye) :
> gtf 3840 2160 30
> xrandr --newmode "3840x2160_30.00" 339.57 3840 4080 4496 5152 2160
> 2161 2164 2197 -HSync +Vsync
> xrandr --addmode HDMI-1 3840x2160_30.00
> xrandr --output HDMI-1 --mode "3840x2160_30.00"
> the PC crashes (all is black, need to power off).
You should have no need of gtf or mode creation with 620 graphics. Mode creation
via xrandr is an anachronism. X knows very well how to auto generate modes when
provided with needed specs. If EDID, the usual source for the data, is broken,
then provide the specs via:
/etc/X11/xorg.conf.d/50-monitor.conf
containing the horizontal sync and vertical refresh rates for your display,
e.g.:
Section "Monitor"
Identifier "Default Monitor"
HorizSync 28-85
VertRefresh 50-100
EndSection
Usually you can get these two specs if not elsewhere using:
hwinfo --monitor
As to why you're having the problem, let us see the resulting URL from:
pastebinit /var/log/Xorg.0.log
as a start.
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based on faith, not based on science.
Team OS/2 ** Reg. Linux User #211409 ** a11y rocks!
Felix Miata
