Re: Failure to use 3840x2160 30hz with Intel 620 chipset
On 7/11/21 12:29 AM, Felix Miata wrote:
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?
Screen 0: minimum 320 x 200, current 3840 x 1080, maximum 16384 x 16384
eDP-1 connected primary 1920x1080+0+0 (normal left inverted right x axis
y axis) 309mm x 174mm panning 1920x1080+0+0
1920x1080 60.05 + 60.01 59.97 59.96* 59.93
1680x1050 59.95 59.88
1600x1024 60.17
1400x1050 59.98
1600x900 59.99 59.94 59.95 59.82
1280x1024 60.02
1440x900 59.89
1400x900 59.96 59.88
1280x960 60.00
1440x810 60.00 59.97
1368x768 59.88 59.85
1360x768 59.80 59.96
1280x800 59.99 59.97 59.81 59.91
1152x864 60.00
1280x720 60.00 59.99 59.86 59.74
1024x768 60.04 60.00
960x720 60.00
928x696 60.05
896x672 60.01
1024x576 59.95 59.96 59.90 59.82
960x600 59.93 60.00
960x540 59.96 59.99 59.63 59.82
800x600 60.00 60.32 56.25
840x525 60.01 59.88
864x486 59.92 59.57
800x512 60.17
700x525 59.98
800x450 59.95 59.82
640x512 60.02
720x450 59.89
700x450 59.96 59.88
640x480 60.00 59.94
720x405 59.51 58.99
684x384 59.88 59.85
680x384 59.80 59.96
640x400 59.88 59.98
576x432 60.06
640x360 59.86 59.83 59.84 59.32
512x384 60.00
512x288 60.00 59.92
480x270 59.63 59.82
400x300 60.32 56.34
432x243 59.92 59.57
320x240 60.05
360x202 59.51 59.13
320x180 59.84 59.32
HDMI-1 connected 1920x1080+1920+0 (normal left inverted right x axis y
axis) 697mm x 392mm panning 1920x1080+1920+0
1920x1080 30.00* 29.97
DP-1 disconnected (normal left inverted right x axis y axis)
HDMI-2 disconnected (normal left inverted right x axis y axis)
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.
I have tried to remove acpi_backlight=vendor, but
https://paste.debian.net/1204642/
shows no significant difference with https://paste.debian.net/1203999
Whatever caused [ 313.732] (WW) modeset(0): Option "PreferredMode" is not used
I can't tell.
My idea is that this reason is that the limitation to 30Hz is not
described by
Section "Monitor"
Identifier "HDMIcon"
HorizSync 30-135
VertRefresh 29-31
Option "PreferredMode" "3840x2160"
EndSection
So, I have used gtf to create a 3840 2160 30 Modeline. As i have read
the cvt is more "modern", I trie now with
Modeline "3840x2160_30.00" 338.75 3840 4080 4488 5136 2160 2163 2168
2200 -hsync +vsync
And...
It fails too with :
https://paste.debian.net/1204643/
With the following result :
- eDP-1 is dislayed correctly
- HDMI seems to remain as before startx is executed, but a cursor,
certainly a X cursor appears in the high left corner of the screen. This
cursor seems to move a little when I move the mouse but returns
immediately to the corner. I have to kill kill the session with another
console.
I think that either I have not found hye good "Modeline" either it is a
bug (maybe in the driver), but it is surprising that I am the 1rst to
have this problem as this monitor is available since 2019...
Reply to: