changing grub resolution

[cet]

I bought a new monitor and it is working fine,but every time I am at the grub screen the monitor tries to fine tune and adjusts itself,if I open the monitor after the grub screen nothing is adjusted and I see the display.I think I have to change the grub screen resolution.I found this :
Step 1: find the preferred mode

Reboot and press and hold shift to display your grub. Press C to enter console mode.

Type vbeinfo

this will display various stuff how grub recognises your display. At the bottom is "preferred mode" - in your case it should say 1200x800. Note down the value.

Note: sometimes, some buggy video cards incorrectly give Grub the wrong preferred resolution - if the preferred mode is much higher than you were expecting, then select the nearest mode in the list displayed that you were expecting.

Press ESC to return to grub and press Enter to boot.

Step 2: Setting the resolution in grub

Reach for your terminal and type

sudo nano /etc/default/grub
find the line

#GRUB_GFXMODE=640x480

remove the # and change 640x480 for the preferred mode you wrote down.

e.g. GRUB_GFXMODE=1200x800

save, then type

sudo update-grub

I tried vbeinfo and it says the preferred mode is 1366x768 which is the resolution I use.So is it safe to change the grub as suggested.Sorry I have never edited anything for grub and I am afraid to break somethings.Please tell me if it is safe so I can change the grub screen resolution.

[Ocky]

cet, that should be fine. http://members.iinet.net/~herman546/...nu_Resolution_
I did it for my 1440x900 resolution.
Congratulations on your new monitor !

[cet]

Thanks,I changed the resolution and it is fine now.But every time I boot up the computer and turn on the screen ,the monitor adjusts from 1 to 100 at the grub screen.Strange.

[Ocky]

Originally Posted by cet

Thanks,I changed the resolution and it is fine now.But every time I boot up the computer and turn on the screen ,the monitor adjusts from 1 to 100 at the grub screen.Strange.

I am not sure what you mean. Do you mean the time out ? If so set it to 10 secs. GRUB_TIMEOUT="10" in /etc/default/grub

[cet]

It is not about grub,it is about the monitor.I see the monitor adjusting auto lines from 1 to 100. 1IIIIIIIIIII........100 like this.