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Shuls avatar Ubuntu

Black lines around screen when setting resolution to 1600x900

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Shuls

I'm using ubuntu 20.04.3 in a lenovo laptop, with a second monitor connected through HDMI. When i connected the second monitor, i noted that 1600x900 resolution wasn't available, so i searched a lot and found a way to add the resolution, but, when i apply the resolution doing

$ cvt 1600 900 60
$ xrandr --newmode "1600x900_60.00"  118.25  1600 1696 1856 2112  900 903 908 934 -hsync +vsync
$ xrandr --addmode HDMI-1 "1600x900_60.00"

My resolution changes, but 2 fat black lines appear to the sides of the screen. 1600x900 is the right resolution of the screen, 1920x1080 seems too tiny.

The workaround i've been using is: using it with 1920x1080 and use fractional scaling to get a 125% zoom, but this is very very laggy and annoying.

Is there a way to get rid of those black lines?

PD: also, i tried adding wider resolutions like 1680x1050 but it doesn't work, the same black lines, same width but the screen is tinier.

PD2: I can use a 1600x900 resolution on windows, so the graphic card supports the resolution.

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