Pierre Couderc composed on 2021-07-09 09:05 (UTC+0200):
> Felix Miata wrote:
>>>> 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:
> Yes, EDID is wrong and does not show 3840x2160 warranted by Samsung for UR59C
> 32".
>>> /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
> This has no effect but I suppose the problem is due to the 2 screen
> configuration. So I have tried replacing Identifier with :
> Identifier "HDMI-1"
> But it is not better...
> I have put in https://paste.debian.net/1203873/
> the content of .local/share/xorg/Xorg.0.log
> It seems that the Modeline 3840x2160 is recognized, but the 30hz
> limitation is not expressed.
> Acer swift5 specifies 3840x2160 but with a 30hz limitation, no more
> frequency.
With dual displays, setup is more complicated, instead of
/etc/X11/xorg.conf.d/50-monitor.conf
try /etc/X11/xorg.conf with the following content:
Section "Device"
Identifier "UHD620"
Driver "modesetting"
Option "monitor-eDP-1" "eDPcon"
Option "monitor-HDMI-1" "HDMIcon"
EndSection
Section "Monitor"
Identifier "HDMIcon"
HorizSync 30-135
VertRefresh 29-31
Option "PreferredMode" "3840x2160"
EndSection
Section "Monitor"
Identifier "eDPcon"
Option "Primary" "true"
EndSection
Section "Screen"
Identifier "extScreen"
Device "UHD620"
Monitor "HDMIcon"
EndSection
Section "Screen"
Identifier "intScreen"
Device "UHD620"
Monitor "eDPcon"
EndSection
Also, make sure your HDMI cable is up to specs for 4K.
--
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
