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trying to add new screen resolution: xrandr: cannot find output "e-DP1"

After the first reboot and login to cinnemon, my display configuration manager doesn't show lower resolutions with 16:9 aspect ratio. Trying to add one, I encounter the error that `xrandr` cannot find the display. 

Code: [Select]
$ cvt 1920 1080
# 1920x1080 59.96 Hz (CVT 2.07M9) hsync: 67.16 kHz; pclk: 173.00 MHz
Modeline "1920x1080_60.00"  173.00  1920 2048 2248 2576  1080 1083 1088 1120 -hsync +vsync

$ xrandr --newmode "1920x1080_60.00" 173.00  1920 2048 2248 2576  1080 1083 1088 1120 -hsync +vsync

$ xrandr -q
Screen 0: minimum 320 x 200, current 1280 x 960, maximum 8192 x 8192
eDP-1 connected primary 1280x960+0+0 (normal left inverted right x axis y axis) 310mm x 174mm
   2560x1440     60.00 +
   1920x1440     60.00 
   1856x1392     60.01 
   1792x1344     60.01 
   1600x1200     60.00 
   1400x1050     59.98 
   1280x1024     60.02 
   1280x960      60.00*
   1024x768      60.04    60.00 
   960x720       60.00 
   928x696       60.05 
   896x672       60.01 
   800x600       60.00    60.32    56.25 
   700x525       59.98 
   640x512       60.02 
   640x480       60.00    59.94 
   512x384       60.00 
   400x300       60.32    56.34 
   320x240       60.05 
DP-1 disconnected (normal left inverted right x axis y axis)
HDMI-1 disconnected (normal left inverted right x axis y axis)
DP-2 disconnected (normal left inverted right x axis y axis)
HDMI-2 disconnected (normal left inverted right x axis y axis)
  1920x1080_60.00 (0x134) 173.000MHz -HSync +VSync
        h: width  1920 start 2048 end 2248 total 2576 skew    0 clock  67.16KHz
        v: height 1080 start 1083 end 1088 total 1120           clock  59.96Hz

$ xrandr --addmode "e-DP1" "1920x1080_60.00"
xrandr: cannot find output "e-DP1"

Re: trying to add new screen resolution: xrandr: cannot find output "e-DP1"

Reply #1
interestingly, the problem doesn't exist under MATE. hmm

Re: trying to add new screen resolution: xrandr: cannot find output "e-DP1"

Reply #2
false alarm. logout/login fixed the issue (don't know why)

Quote
have you turned it off an on again?