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How to increase screen resolution in Fedora

For unknown monitor type in fedora, if I know my screen can have the resolution of  1680×1050, but the setting doesn’t have the option for me to choose, then to switch to the resolution:

# xrandr -q
# gtf 1680 1050 60
Modeline "1680x1050_60.00" 147.14 1680 1784 1968 2256 1050 1051 1054 1087 -HSync +Vsync

copy the green part after Modeline, and append it as the following:

# xrandr --newmode "1680x1050_60.00"  147.14  1680 1784 1968 2256  1050 1051 1054 1087  -HSync +Vsync
# xrandr --addmode VGA1 1680x1050_60.00

Now you can go to the display setting and choose this mode. Or

# xrandr --output VGA1 --mode 1680x1050_60.00)

For me, above only worked for current session. After I logged out, it didn’t work again. I have 2 monitors. I later actually solved this problem by switching the cable. The problem may be because of the cable didn’t connect correctly.
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