Ubuntu

Video driver not maintaining resolution

Asked by Pradip Sagdeo

I have ATI Radeon 9000 series video card. The system booted up with what looked like an 800x600 resolution after initial install, I changed the resolution and monitor to 1600x1200 and Viewsonic G220f that I have. The first couple of times it had trouble holding on to the high resolution without losing the mouse. After a few reboots, it seemed to find its way and work fine. Now after power on boot up, the login screen is 800x600 and after log in, the screen achieves the set high resolution. I am reluctant to load drivers from ATI site. Can anyone shed some light on this irksome behavior? Will greatly appreciate it.

Pradip Sagdeo

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Robert Di Gioia (digioiar) said : 		#1

Hi

In the file /etc/X11/xorg.conf there should be a section called "Screen". Inside this section, there should be several subsections called "Display". In each of these subsections, there will be a line that begins with the word "Modes", just make sure that 1600x1200 is the first resolution listed on this line in each of the subsections.

You should make a backup of the file first, because if you mess up, your system may not boot into X, and you may have to fix it from a console :)

To make a backup open a terminal and type the following commands

cd /etc/X11
sudo cp xorg.conf xorg.conf.bak

To edit the file, use an editor such as gedit. the command from a terminal is (assuming that you haven't changed directory from the above commands)

sudo gedit xorg.conf

Some hopefully helpful tips
the resolutions need to be in double quotes
there needs to be a space between each set of resolutions

Next time you reboot, if something goes wrong, and X can't start, login to the text console, and type the following commands to restore your old configuration

cd /etc/X11
sudo cp xorg.conf.bak xorg.conf
reboot

good luck

Revision history for this message
Pradip Sagdeo (pradipsagdeo) said : 		#2

Checked the xorg.conf file. All entries correct, 1600x1200@85 is the first entry. Funny thing is, since I submitted the question, the computer is behaving just fine. Thanks.

Pradip

Revision history for this message
Pradip Sagdeo (pradipsagdeo) said : 		#3

Robert:

Thanks for your quick response. The Modes line has the 1600x1200@85 listed
first. There is only one modes section. I wonder what is going on because,
since I submitted this question, the computer is behaving just fine. Thanks
again.

Pradip Sagdeo
-----Original Message-----
From: <email address hidden> [mailto:<email address hidden>] On Behalf Of
Robert Di Gioia
Sent: Friday, February 08, 2008 10:21 PM
To: <email address hidden>
Subject: Re: [Question #24212]: Video driver not maintaining resolution

Your question #24212 on Ubuntu changed:
https://answers.launchpad.net/ubuntu/+question/24212

    Status: Open => Answered

Robert Di Gioia proposed the following answer:
Hi

In the file /etc/X11/xorg.conf there should be a section called
"Screen". Inside this section, there should be several subsections
called "Display". In each of these subsections, there will be a line
that begins with the word "Modes", just make sure that 1600x1200 is the
first resolution listed on this line in each of the subsections.

You should make a backup of the file first, because if you mess up, your
system may not boot into X, and you may have to fix it from a console :)

To make a backup open a terminal and type the following commands

cd /etc/X11
sudo cp xorg.conf xorg.conf.bak

To edit the file, use an editor such as gedit. the command from a
terminal is (assuming that you haven't changed directory from the above
commands)

sudo gedit xorg.conf

Some hopefully helpful tips
the resolutions need to be in double quotes
there needs to be a space between each set of resolutions

Next time you reboot, if something goes wrong, and X can't start, login
to the text console, and type the following commands to restore your old
configuration

cd /etc/X11
sudo cp xorg.conf.bak xorg.conf
reboot

good luck

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