post the output of this command:
xrandr --verbose
netrunner@netrunner:~$ sudo xrandr --verbose
Screen 0: minimum 320 x 200, current 1366 x 768, maximum 16384 x 16384
eDP connected 1366x768+0+0 (0x56) normal (normal left inverted right x axis y axis) 344mm x 194mm
Identifier: 0x53
Timestamp: 28168
Subpixel: horizontal rgb
Gamma: 1.0:1.0:1.0
Brightness: 1.0
Clones:
CRTC: 0
CRTCs: 0 1 2 3
Transform: 1.000000 0.000000 0.000000
0.000000 1.000000 0.000000
0.000000 0.000000 1.000000
filter:
EDID:
00ffffffffffff004c83514400000000
00160104902213780a8135945b578f29
1e505400000001010101010101010101
010101010101ce1d56f0500018304030
250058c210000019d81356f050001830
4030250058c210000019000000000000
00000000000000000000000000000002
000c4cff0a3c641415236400000000c5
scaling mode: Full
supported: None Full Center Full aspect
1366x768 (0x56) 76.3MHz -HSync -VSync *current +preferred
h: width 1366 start 1430 end 1478 total 1606 skew 0 clock 47.5KHz
v: height 768 start 770 end 775 total 792 clock 60.0Hz
1366x768 (0x57) 50.8MHz -HSync -VSync
h: width 1366 start 1430 end 1478 total 1606 skew 0 clock 31.6KHz
v: height 768 start 770 end 775 total 792 clock 39.9Hz
1280x720 (0x58) 74.5MHz -HSync +VSync
h: width 1280 start 1344 end 1472 total 1664 skew 0 clock 44.8KHz
v: height 720 start 723 end 728 total 748 clock 59.9Hz
1152x768 (0x59) 71.8MHz -HSync +VSync
h: width 1152 start 1216 end 1328 total 1504 skew 0 clock 47.7KHz
v: height 768 start 771 end 781 total 798 clock 59.8Hz
1024x768 (0x5a) 63.5MHz -HSync +VSync
h: width 1024 start 1072 end 1176 total 1328 skew 0 clock 47.8KHz
v: height 768 start 771 end 775 total 798 clock 59.9Hz
800x600 (0x5b) 38.2MHz -HSync +VSync
h: width 800 start 832 end 912 total 1024 skew 0 clock 37.4KHz
v: height 600 start 603 end 607 total 624 clock 59.9Hz
848x480 (0x5c) 31.5MHz -HSync +VSync
h: width 848 start 872 end 952 total 1056 skew 0 clock 29.8KHz
v: height 480 start 483 end 493 total 500 clock 59.7Hz
720x480 (0x5d) 26.8MHz -HSync +VSync
h: width 720 start 744 end 808 total 896 skew 0 clock 29.9KHz
v: height 480 start 483 end 493 total 500 clock 59.7Hz
640x480 (0x5e) 23.8MHz -HSync +VSync
h: width 640 start 664 end 720 total 800 skew 0 clock 29.7KHz
v: height 480 start 483 end 487 total 500 clock 59.4Hz
HDMI-0 disconnected (normal left inverted right x axis y axis)
Identifier: 0x54
Timestamp: 28168
Subpixel: horizontal rgb
Clones:
CRTCs: 0 1 2 3
Transform: 1.000000 0.000000 0.000000
0.000000 1.000000 0.000000
0.000000 0.000000 1.000000
filter:
underscan vborder: 0 (0x00000000) range: (0,128)
underscan hborder: 0 (0x00000000) range: (0,128)
underscan: off
supported: off on auto
coherent: 1 (0x00000001) range: (0,1)
netrunner@netrunner:~$