Super User is a question and answer site for computer enthusiasts and power users. It's 100% free, no registration required.

Sign up
Here's how it works:
  1. Anybody can ask a question
  2. Anybody can answer
  3. The best answers are voted up and rise to the top

In my monitor it says "Out of Range" black screen. Where i need to set the VGA output resolution to 1024x768 having 60hz or 70hz.

Here is the following lines i have tried but it fails.

    $ cvt 1024 768
    $ xrandr --newmode shvga 74.50 1024 1072 1176 1328  768 771 775 798
    $ xrandr --addmode VGA-1 shvga
    $ xrandr --output VGA-1 --mode shvga

Follow up: SOLVED

1) how do to i tell penguin, please set my refresh rate to 60 or 70 ro 70.1?
$ xrandr --output VGA-1 --mode shvga --rate 70.1


$ cvt 1024 768 70.1
# 1024x768 70.04 Hz (CVT) hsync: 56.18 kHz; pclk: 75.50 MHz
Modeline "1024x768_70.10"   75.50  1024 1080 1184 1344  768 771 775 802 -hsync +vsync 

$ xrandr --newmode shvga 75.50  1024 1080 1184 1344  768 771 775 802 -hsync +vsync
                         This is not reliable 
share|improve this question
up vote 1 down vote accepted

Make sure you're using a frequency that's actually supported by your monitor, as it is the frequency that is often "Out of Range". Finding a tech sheet for the monitor (usually on the OEM's site) should give you the required information.

share|improve this answer
i am doing that. Mostly the ranges that works are 60 to 70hz. And in my line of code, i have assigned that but it fails. – YumYumYum Nov 24 '12 at 11:41

Your Answer


By posting your answer, you agree to the privacy policy and terms of service.

Not the answer you're looking for? Browse other questions tagged or ask your own question.