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Old 10-08-2012, 07:04 AM   #1
bluefloyd
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Registered: Oct 2012
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Upgrade to Ubuntu 12.04, now monitor doesn't display?


Hi all, I have upgraded Ubuntu from 10 to 12.04, 10 worked fine. When I fire the pc up I get the bios screen no problems however when Ubuntu boots up the display goes to an encrypted sort of interferance and the monitor says 'unsupported format' or something like that.

Does 12 ask more of the monitor than 10, hence the error? I'm going to see if I can borrow another monitor, just wondered if it's likely that it is the monitor or if the install has failed?

Thanks
 
Old 10-08-2012, 09:23 AM   #2
Wim Sturkenboom
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Registered: Jan 2005
Location: Roodepoort, South Africa
Distribution: Slackware 10.1/10.2/12, Ubuntu 12.04, Crunchbang Statler
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It's not the monitor, it's a misconfigured grub and possibly some more misconfiguration. So another monitor might help for now, but you can not forever borrow it or buy a new one each time Ubuntu decides to screw up

Quote:
the display goes to an encrypted sort of interferance
and
Quote:
'unsupported format'
Those two basically contradict each other. I assume you first get the first one and later the second one.

Please post make and model of your videocard and monitor.

PS: Does your first screen look like this one? http://ubuntuforums.org/showthread.php?t=1943960
PPS: Is this a dual boot?

Last edited by Wim Sturkenboom; 10-08-2012 at 12:44 PM. Reason: Added PPS
 
Old 10-08-2012, 02:49 PM   #3
bluefloyd
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Thanks for your reply. It's sorted, sort of, seems that the part of the system boot which used to allow me to use a backup version for recovery is what is causing it. After leaving it for 30 seconds I pressed enter a few times, and hey presto I'm at the login screen.
The unsupported format message was from the monitor and not the pc. Its not actually encrypted I was trying to describe its appearance, not static but a garbled mess.
 
Old 10-09-2012, 12:16 AM   #4
Wim Sturkenboom
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Registered: Jan 2005
Location: Roodepoort, South Africa
Distribution: Slackware 10.1/10.2/12, Ubuntu 12.04, Crunchbang Statler
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Quote:
The unsupported format message was from the monitor and not the pc
I know

I guess you're talking about the grub menu. You can edit /etc/default/grub to try to get it sorted; you need root permissions for this (so use of sudo or gksudo). Find the following line in that file and remove the '#' at the beginning.
Code:
#GRUB_TERMINAL=console
Save the file and run the below command (this will update grub.cfg)
Code:
sudo update-grub
Next time you boot, you should get a normal grub menu (in case you're dual booting).

If you're not dual booting (and I think you're not), you can force Grub to show the menu. The same file contains a line like
Code:
GRUB_HIDDEN_TIMEOUT=10
Remove the number at the end and save the file (leave the '='). Next run update_grub as shown above.

Last edited by Wim Sturkenboom; 10-09-2012 at 12:19 AM.
 
Old 10-09-2012, 03:37 AM   #5
bluefloyd
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Thanks for your help, I'll give that a go.
 
  


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