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Low resolution on second monitor, xrandr throws error

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linux-howto

http://askubuntu.com – When I connect an external monitor to my laptop through VGA cable, it has extremely low resolutions and no higher options to choose from. I tried the following (based on this; other sites just suggest the same approach) (restarting doesn't help) $ gtf 1920 1080 60 # 1920x1080 @ 60.00 Hz (GTF) hsync: 67.08 kHz; pclk: 172.80 MHz Modeline "1920x1080_60.00" 172.80 1920 2040 2248 2576 1080 1081 1084 1118 -HSync +Vsync $ xrandr --newmode "1920x1080_60.00" 172.80 1920 2040 2248 2576 1080 1081 1084 1118 -HSync +Vsync $ xrandr --addmode VGA-0 "1920x1080_60.00" X Error of failed request: BadM (HowTos)