I have an external monitor connected to my laptop. It's currently set to 1920x1080p@60Hz. I want it set to 1920x1080p@75Hz. I've used this refresh rate in Windows 8.1 for over a year without problems. The monitor can be connected via DisplayPort or HDMI.
Kubuntu 17.10
Nvidia gtx 960m
Nvidia driver version: 384.98
Update 2018/09/26:
Still not working. I even did a fresh install.
Kubuntu 18.04
Nvidia driver 390.48
Things I have already tried
Format:
page where I found the instructions
command
result
Changing refresh rate for specific monitor
xrandr --output DP-3 --rate 75
Nothing happens.
xrandr --output DP-3 --mode 1920x1080 --rate 75
"no input/signal detected"
xrandr --output HDMI0 --mode 1920x1080 --rate 75
Screen shakes/vibrates up and down.
How set my monitor resolution?
cvt 1920 1080 75
1920x1080 74.91 Hz (CVT 2.07M9) hsync: 84.64 kHz; pclk: 220.75 MHz
Modeline "1920x1080_75.00" 220.75 1920 2064 2264 2608 1080 1083 1088 1130 -hsync +vsync
xrandr --query | grep connected
HDMI-0 disconnected (normal left inverted right x axis y axis)
DP-0 disconnected (normal left inverted right x axis y axis)
DP-1 disconnected (normal left inverted right x axis y axis)
DP-2 disconnected (normal left inverted right x axis y axis)
DP-3 connected primary 1920x1080+1920+0 (normal left inverted right x axis y axis) 527mm x 296mm
eDP-1-1 connected 1920x1080+0+0 (normal left inverted right x axis y axis) 344mm x 194mm
xrandr --addmode DP-3 "1920x1080_75.00"
X Error of failed request: BadMatch (invalid parameter attributes)
Major opcode of failed request: 140 (RANDR)
Minor opcode of failed request: 18 (RRAddOutputMode)
Serial number of failed request: 50
Current serial number in output stream: 51
https://askubuntu.com/a/380817/544685
sudo nano /etc/X11/xorg.conf
No section named 'monitor'
https://askubuntu.com/a/727897/544685
gtf 1920 1080 75
1920x1080 @ 75.00 Hz (GTF) hsync: 84.60 kHz; pclk: 220.64 MHz
Modeline "1920x1080_75.00" 220.64 1920 2056 2264 2608 1080 1081 1084 1128 -HSync +Vsync
xrandr --newmode "1920x1080_75.00" 220.64 1920 2056 2264 2608 1080 1081 1084 1128 -HSync +Vsync
X Error of failed request: BadName (named color or font does not exist)
Major opcode of failed request: 140 (RANDR)
Minor opcode of failed request: 16 (RRCreateMode)
Serial number of failed request: 50
Current serial number in output stream: 50
cvt -r 1920 1080 75
ERROR: Multiple of 60Hz refresh rate required for reduced blanking.
xrandr --newmode "1920x1080-ok" 220.64 1920 2056 2264 2608 1080 1081 1084 1128 -HSync +Vsync
Works (I think).
xrandr --addmode DP-3 "1920x1080-ok"
X Error of failed request: BadMatch (invalid parameter attributes)
Major opcode of failed request: 140 (RANDR)
Minor opcode of failed request: 18 (RRAddOutputMode)
Serial number of failed request: 50
Current serial number in output stream: 51
xrandr --addmode DP-3 1920x1080-ok
X Error of failed request: BadMatch (invalid parameter attributes)
Major opcode of failed request: 140 (RANDR)
Minor opcode of failed request: 18 (RRAddOutputMode)
Serial number of failed request: 50
Current serial number in output stream: 51
