Problem creating new resolution in Lubuntu 16.04 - Ask Ubuntu


i'm trying create new resolution of video, in lubuntu 16.04.

i tried:

generate "modeline"

cvt 1024 768 60 output: modeline "1024x768_60.00"   63.50  1024 1072 1176 1328  768 771 775 798 -hsync +vsync 

create new mode

xrandr --newmode "1024x768_60.00"   63.50  1024 1072 1176 1328  768 771 775 798 -hsync +vsync output: xrandr: failed size of gamma output default 

video name default

then

 sudo xrandr --addmode default 1024x768_60.00 

the new resolution appears in list, not work, when click on apply nothing happens.

i noticed maximum , minimum limits equal running xrandr command.

screen 0: minimum 640 x 480, current 640 x 480, maximum 640 x 480 default connected 640x480+0+0 0mm x 0mm    640x480       73.00*     1024x768_60.00  59.92 

i think problem ...

how change maximum resolution value ??

output info of hardware

lshw -c video output:  *-display unclaimed             description: vga compatible controller        product: 661/741/760 pci/agp or 662/761gx pcie vga display adapter        vendor: silicon integrated systems [sis]        physical id: 0        bus info: pci@0000:01:00.0        version: 00        width: 32 bits        clock: 66mhz        capabilities: pm agp agp-3.0 vga_controller cap_list        configuration: latency=0        resources: memory:e0000000-e7ffffff memory:ed000000-ed01ffff ioport:a000(size=128) 

display:

lg flatron l1553s-sf


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