<display device> connected primary <mod> ....
wakatana@lubuntu:~$ sudo xrandr -qxrandr: Failed to get size of gamma for output defaultScreen 0: minimum 1280 x 1024, current 1280 x 1024, maximum 1280 x 1024default connected 1280x1024+0+0 0mm x 0mm 1280x1024 77.00*wakatana@lubuntu:~$ cvt 1680 1050# 1680x1050 59.95 Hz (CVT 1.76MA) hsync: 65.29 kHz; pclk: 146.25 MHzModeline "1680x1050_60.00" 146.25 1680 1784 1960 2240 1050 1053 1059 1089 -hsync +vsyncwakatana@lubuntu:~$ xhost si:localuser:rootlocaluser:root being added to access control listwakatana@lubuntu:~$ sudo xrandr --newmode "1680x1050_60.00" 146.25 1680 1784 1960 2240 1050 1053 1059 1089 -hsync +vsyncxrandr: Failed to get size of gamma for output defaultwakatana@lubuntu:~$ xrandr --newmode "1680x1050_60.00" 146.25 1680 1784 1960 2240 1050 1053 1059 1089 -hsync +vsyncxrandr: Failed to get size of gamma for output defaultX 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: 19 Current serial number in output stream: 19wakatana@lubuntu:~$ xrandr -qxrandr: Failed to get size of gamma for output defaultScreen 0: minimum 1280 x 1024, current 1280 x 1024, maximum 1280 x 1024default connected 1280x1024+0+0 0mm x 0mm 1280x1024 77.00* 1680x1050_60.00 (0x2f1) 146.250MHz -HSync +VSync h: width 1680 start 1784 end 1960 total 2240 skew 0 clock 65.29KHz v: height 1050 start 1053 end 1059 total 1089 clock 59.95Hz