up vote 42 down vote favorite
10

My eyes hurt so I thought I should check the screen refresh rate (monitor frequency), but I couldn't find it.

Where is it? (in Ubuntu 12)

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If your eyes hurt, I suggest you check out the topic of color temperature correction (F.lux and redshift are two great apps for this) – Bernát Jun 10 '15 at 19:02
up vote 51 down vote accepted

Compiz looked like it worked. But it didn't work.

So the solution to this is the following.

First we check available modes.
$ xrandr
1440x900       59.9+*   75.0
1280x1024      75.0     60.0

Then we pick the mode, including resolution and refresh rate.
$ xrandr -s 1440x900 -r 75

Or just the refresh rate
$ xrandr -r 75

Let's see if it worked
$ xrandr
1440x900       59.9+    75.0*
1280x1024      75.0     60.0

Alright. Then all you have to do is add the command to Startup Applications and be done.

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1  
I wonder why didnt some one mention this ?????? Rate 75.0 Hz not available for this size" . Its not the correct solution at all. – Pratik C Joshi Feb 13 '15 at 18:21
1  
@PratikCJoshi Try using a different type of cable, for example HDMI. – Niel de Wet Apr 13 '16 at 13:30
    
@PratikCJoshi You probably used xrandr -r 75.0, which may not work, while xrand -r 75 should. Even if the displayed framerate is something like 74.98 (my case) you should take the nominal value and use xrandr -r 75. – fsanches Oct 20 '16 at 2:14
    
Could somebody please tell me why GUI tools ignore refresh rate? If xrandr can do it, why can't they? Isn't it it a basic setting? – Nandakumar Edamana Jan 28 '17 at 16:11
    
BTW, from here: star (*) is the current mode, the plus (+) is the preferred one. Most monitors report a preferred mode to the driver. – Pablo Bianchi Apr 30 '17 at 22:19
up vote 15 down vote

open your terminal and type this 

sudo apt-get install compizconfig-settings-manager

then type compiz in your unity dash , it will list you compiz settings manager .Open compiz and at general options click at composite and there you have untick the detect refresh rate then you can manually set the value you want . enter image description here .

and two know allowed refresh rates for the resolution you can use xrandr

the second row are allowed refresh rates with respect to the resolutions . so by depending on resolutions you have set , you can change the refresh rate by using the above methods . enter image description here

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3  
How can I know which is the max allowed? Can't this break my monitor? – HappyDeveloper Jun 7 '12 at 3:08
    
Perfect, thanks! – HappyDeveloper Jun 9 '12 at 17:12
    
Do you really think its that simple ??? It adjusts to 60Hz on reboot no matter what value you set !!! – Pratik C Joshi Feb 13 '15 at 18:20

protected by Community♦ Dec 12 '12 at 2:41

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