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  #1  
Old 24th September 2012, 01:47 AM
slopoke_iii Offline
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Posts: 39
linuxfirefox
grub2 problem after f17 installation.

I dual boot windows 7 and fedora. after i installed f17, when grub2 should load with the menu options, i get a message the says input not supported. i have no idea why. i can arrow up or down and get to windows or fedora but there is no text there to tell what kernel i am booting into. all it says is input not supported. I have tried reinstalling fedora and also have repaired the boot record of win 7. still the same thing. anyone have any idea what is going on ?
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  #2  
Old 24th September 2012, 02:20 AM
runmachine Offline
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Location: China
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linuxchrome
Re: grub2 problem after f17 installation.

Maybe your keyboard or monse,not be spported
Also,the resolution of your screen maybe not properly

Last edited by runmachine; 24th September 2012 at 02:28 AM.
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  #3  
Old 24th September 2012, 02:49 AM
DBelton Offline
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linuxfirefox
Re: grub2 problem after f17 installation.

That is a bug in Fedora 17. What happens is grub2 tries to set your resolution to a mode that isn't supported by the video adapter.

Anything over 1280x1024 isn't in the vesa specs so may or may not be supported, but it appears that grub sees what the monitor can display and tries to set that mode, even if the video adapter can't display it in vesa mode.

If you let it sit there, it will boot normally, you just can't see anything on the screen until it loads your video drivers.

Once it boots, you can edit your /etc/default/grub file and force a mode it can display.

Just add these lines to your /etc/default/grub file:

Code:
GRUB_GFXMODE=1280x1024x32
GRUB_GFXMODE_LINUX=1280x1024x32
GRUB_GFXPAYLOAD=keep
Then rebuild your grub.cfg file
Code:
grub2-mkconfig -o /boot/grub2/grub.cfg
All of this has to be done as root user
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  #4  
Old 24th September 2012, 02:29 PM
slopoke_iii Offline
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linuxfirefox
Re: grub2 problem after f17 installation.

thanks for your reply! I have tried to edit grub but when i try to open the grub file in a terminal window with gedit as root user i get an error that i don't have permission to access the file. Is there some other way to edit the file that i am not aware of?
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  #5  
Old 24th September 2012, 02:41 PM
nonamedotc Offline
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Location: USA
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linuxfedorafirefox
Re: grub2 problem after f17 installation.

It is possible that root environment is not properly set when you switched to root. Did you use su or su -? Try,

Code:
su -
[root password]
vim /etc/default/grub
(vim/gedit/nano - should work).

Just to confirm, did you error look something like this?

Quote:
gedit /etc/default/grub

(gedit:3118): EggSMClient-WARNING **: Failed to connect to the session manager: None of the authentication protocols specified are supported


** (gedit:3118): WARNING **: Could not connect to session bus
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  #6  
Old 24th September 2012, 02:47 PM
DBelton Offline
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Join Date: Aug 2009
Posts: 7,320
linuxfirefox
Re: grub2 problem after f17 installation.

As regular user logged into your desktop...

Open terminal window

Code:
su -
(root password)
This should get you the root login shell.

Code:
cd /etc/default

gedit grub
This should edit the file as root user

I have noticed that gedit has issues if you don't get the full root login shell (by using su - or su -l)

or, if you have ever used vi (the console editor) you can try using it. It's a little tricky if you have never used it before, though, so I wouldn't recommend starting out on a necessary file like that unless you back it up beforehand.
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  #7  
Old 24th September 2012, 11:38 PM
slopoke_iii Offline
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Join Date: Oct 2005
Posts: 39
windows_7chrome
Re: grub2 problem after f17 installation.

Thanks for your replies. Your advice got me into gedit and i added the lines to grub. then performed your next step. All seemed well , i rebooted and got a menu in grub tho different than what i expected. when i choose to boot fedora it tried to load and then the monitor goes blank . like no video signal at all. I can't boot into fedora at all. i give. don't know what to do from here.
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  #8  
Old 25th September 2012, 12:13 AM
DBelton Offline
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linuxfirefox
Re: grub2 problem after f17 installation.

you got no errors when you ran the grub2-mkconfig?
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  #9  
Old 25th September 2012, 02:25 AM
slopoke_iii Offline
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Join Date: Oct 2005
Posts: 39
linuxfirefox
Re: grub2 problem after f17 installation.

No i didn't get an error . it looked as tho everything went fine till i tried to boot into fedora. then it appeared to load up to the point where the log screen should appear then nothing. no video at all. thanks for your help but i am gonna reinstall f16 since it was working well.
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  #10  
Old 25th September 2012, 05:10 AM
DBelton Offline
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linuxfirefox
Re: grub2 problem after f17 installation.

That sounds like your system booted fine. It just didn't start your desktop.
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