120hz not available in KDE Neon with gt 730, and tearing, how to fix?

Question

linux

120hz is not available - only 60 or 50. In addition, there is a strong tearing, this is noticeable when scrolling through the browser and when dragging windows. Monitor LC24FG70FQIXCI , graphics card gt 730 - both have hdmi 1.4a - i.e. can give via hdmi 1920x1080 120hz.

Screenshot in KDE

xrandr output

[email protected]:~$ xrandr
Screen 0: minimum 8 x 8, current 1920 x 1080, maximum 16384 x 16384
DVI-I-0 disconnected (normal left inverted right x axis y axis)
VGA-0 disconnected (normal left inverted right x axis y axis)
DVI-I-1 disconnected (normal left inverted right x axis y axis)
HDMI-0 connected primary 1920x1080+0+0 (normal left inverted right x axis y axis) 532mm x 304mm
   1920x1080     60.00*+  59.94    50.00  
   1680x1050     59.95  
   1600x900      60.00  
   1440x900      59.89  
   1280x1024     75.02    60.02  
   1280x800      59.81  
   1280x720      60.00    59.94    50.00  
   1152x864      75.00  
   1024x768      75.03    70.07    60.00  
   800x600       75.00    72.19    60.32    56.25  
   720x576       50.00  
   720x480       59.94  
   640x480       75.00    72.81    59.94

Driver from nvidia 390.141

Answer 1

Neither I nor my colleagues were able to start these cards normally, with sneakers and 120hz. Stuck in intel - everything worked by itself, without dancing, at 120hz, and without tearing.

Answer 2

gt710 exports full hd with free firewood
but my monitor is 21:9,25560x1080
so I installed proprietary firewood, some 400-tee
and it worked with 390 = there were no problems mint
mateza as an option write in /etc/X11/xorg.conf google man xrender or where you have it

Answer 3

try to create a new mode and add it to xrandr
get the necessary info for the new mode

cvt -r 1920 1080 120
# 1920x1080 119.88 Hz (CVT) hsync: 137.14 kHz; pclk: 285.25 MHz
Modeline "1920x1080R"  285.25  1920 1968 2000 2080  1080 1083 1088 1144 +hsync -vsync

copy the line after the Modelline (the values ​​will be yours), create a mode and apply it

xrandr --newmode "1920x1080R"  285.25  1920 1968 2000 2080  1080 1083 1088 1144 +hsync -vsync
xrandr --addmode HDMI-0 "1920x1080R"
xrandr --output HDMI-0 --mode 1920x1080R

after reboot, the mode will crash
to boot into this mode, you need to add to Xorg.conf
Section "Monitor"
ModeLine "1920x1080R" 285.25 1920 1968 2000 2080 1080 1083 1088 1144 +hsync -vsync
Option "DPMS"
ps The catch is that 1080p 120Hz is not officially listed in the HDMI 1.4 Specification, so monitors will not report it as a supported mode to the OS, and thus the option for 120Hz will not appear