Oops, left out a line.
Felix Miata composed on 2021-07-08 17:08 (UTC-0400):
> 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
Option "PreferredMode" "3840x2160"
> 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.--
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
