monitor screeching

[champ_weller]

i am running ubuntu 11.04 and i have an old tube monitor with built in speakers and it is screeching on and off it fixes for a while if i turn it off for a while i have been told its the refresh rate but idk what can i do to fix this

[devils casper]

If its a Refresh Rates problem then you should configure those in /etc/X11/xorg.conf file.
Press Alt+F2 and type this

gksu gedit /etc/X11/xorg.conf

* Its Capital X in X11.

Above code will open an empty xorg.conf file in Gedit with root privileges.
Copy following code and paste in Gedit. Save file and reboot machine.

Section "Device"
       Identifier "Configured Video Device"
EndSection

Section "Monitor"
         Identifier "Configured Monitor"
         HorizSync 31.5 - 70.0
         VertRefresh 50 - 160
 EndSection

Section "Screen"
        Identifier "Default Screen"
        Monitor "Configured Monitor"
        Device "Configured Video Device"
        DefaultDepth 24
        Subsection "Display"
             Depth 24
             Modes "1280x1024" "1024x768" 
        EndSubsection
EndSection

I have used Generic Refresh Rates ( HorizSync and VertiRefresh ) in above code.

[champ_weller]

Alright thanks ill PM you how my monitor reacts