HowTo: Reconfigure X with “dpkg-reconfigure xserver-xorg”

[Rocket2DMn]

This HowTo Guide is primarily for users who cannot get into the GUI after a fresh install, a dist-upgrade, a new video card install, or a video driver upgrade, and for users who cannot set their screen resolutions correctly from within the GUI. It is designed to be easy to use without being overly simplistic.

UPDATE: This method does not work with Hardy Heron and probably all versions to follow (including Intrepid Ibex). This method seems to ONLY work with Gutsy Gibbon and older.
I think this is because the newer versions of xserver-xorg rely more on auto-detecting the configuration during runtime rather than looking at xorg.conf.
/UPDATE

Step 1: Get to the terminal

1a) If you are already in the GUI.
For Gnome and Xfce: Applications->Accessories->Terminal
For KDE: KMenu->System->Konsole

1b) If you are NOT in the GUI (maybe you have a blank screen after boot-up)
Do CTRL+ALT+F1 to get to a tty, and login with your username and password. Then depending on your desktop environment, run
For Gnome (Ubuntu):

sudo /etc/init.d/gdm stop

For KDE (Kubuntu):

sudo /etc/init.d/kdm stop

For Xfce (Xubuntu):

sudo /etc/init.d/xdm stop

Step 2: Run the reconfiguration

First start by making a manual backup (even though one will be auto-generated in the form xorg.conf.YearMonthDayTime):

sudo cp /etc/X11/xorg.conf /etc/X11/xorg.conf.backup

Now run the configuration:

sudo dpkg-reconfigure xserver-xorg

Details:
--You will be asked a bunch of questions about your hardware, do your best to answer. If you don’t know the answer, take an educated guess or use the default selection.
--When asked about video drivers, select “ati” if you have an ATI card, “nv” if you have an Nvidia card, or “intel” if you have an onboard Intel graphics card. Otherwise select “vesa” – this is more of a fallback driver if the other options don’t work, it is useful to select this to get into the GUI initially, then install the propriety drivers if needed (step 4).
--When asked about screen resolutions, use TAB to move and SPACEBAR to select your monitor’s max resolution and everything less.

Once the questions are finished, you may proceed.

Step 3: Restart the GUI

3a) You are currently in the GUI, so restart X with CTRL+ALT+BACKSPACE

3b) You are in a tty, so run
For Gnome (Ubuntu):

sudo /etc/init.d/gdm start

For KDE (Kubuntu):

sudo /etc/init.d/kdm start

For Xfce (Xubuntu):

sudo /etc/init.d/xdm start

Step 4: (OPTIONAL) Setup Proprietary Drivers
This is for users whose cards do not have full support with the open source drivers. Nvidia users tend to use this more, but newer ATI cards also need them.
See links for details on card compatibility.

Installing Nvidia propriety drivers
Installing ATI propriety drivers

Details on ati/radeon open source drivers

If something doesn’t work out correctly and you want to recover your previous configuration for X, then restore your backup:

sudo cp /etc/X11/xorg.conf.backup /etc/X11/xorg.conf

Then restart X.

Please do not post help questions on this thread, start a new thread on the Absolute Beginner’s Forum instead. Suggestions, reviews, and critique are certainly welcome.

Keywords: can’t login, broken X, no login screen, blank screen, low or wrong resolution, new video card

[jaya28inside]

sorry

but i hope this could help me out....
sigh... i have an onboard card
and it's poor quality
but then Ubuntu cant' detect it?? so it's appeared blank?

OMG.... help me...!!

[jaya28inside]

and the blank screen was appeared after i choose it
from the Boot Logon...

then BANG!
blank...no other loading or someting else

but after few days.. it happened working OK
suddenly a few hours i restart it again.. .same problems happened...
it's appeared BLANK again hiks

[komputes]

I have usually used the following to reconfigure xorg when the screen did not work properly (such as booting into a black screen).

Press ESC at Grub prompt and select RECOVERY MODE

dpkg-reconfigure -phigh xserver-xorg

This would usually ask me a series of questions concerning my video card, resolution, driver etc.

Removing "-phigh" from the command added a lot more questions concerning the keyboard.

Until recently when I ran that command on a new computer using hardy. -phigh did not work at all and taking it out allowed me to configure they keyboard but does not ask me to configure video (which is what I want to configure). I got the following error:

xserver-xorg postinst warning: overwritting possibly customized configuration file: backup in /etc/X11/xorg.conf.20080203121105

Any Tips? Currently using Intel Mobile VGA GM965/GL960 (Rev3) on Ubuntu Hardy 8.04 alpha5, but I have also seen this when trying to reconfigure an ATI Radeon 9200.

[Rocket2DMn]

"xserver-xorg postinst warning: overwritting possibly customized configuration file: backup in /etc/X11/xorg.conf.20080203121105" - is not an error. This is normal, it is making a backup of your old xorg.conf and putting the new one in its place. Backups are made automatically in the format xorg.conf.YearMonthDayTime
If you need specific help with cards, please start a new thread and somebody will be glad to help you out there. Remember that Hardy is still in alpha, and you will need "intel" driver for the onbard graphics and "ati" open source driver for the 9200.

[WitchCraft]

"xserver-xorg postinst warning: overwritting possibly customized configuration file: backup in /etc/X11/xorg.conf.20080203121105" - is not an error. This is normal, it is making a backup of your old xorg.conf and putting the new one in its place. Backups are made automatically in the format xorg.conf.YearMonthDayTime
If you need specific help with cards, please start a new thread and somebody will be glad to help you out there. Remember that Hardy is still in alpha, and you will need "intel" driver for the onbard graphics and "ati" open source driver for the 9200.

I had this when I couldn't set the screen resolution. It remaind at 600x800...

Neither dpkg-reconfigure nor -phigh worked.

To do it manually:

apt-get install xresprobe

xresprobe -n



make a backup of xorg.conf:

cp /etc/X11/xorg.conf /etc/X11/xorg.backup.conf

Then edit the xorg config file:
sudo gedit /etc/X11/xorg.conf

Look out for these sections:

Section "Monitor"
        Identifier      "Configured Monitor"
        DisplaySize     376 301
EndSection

Section "Screen"
        Identifier      "Default Screen"
        Monitor         "Configured Monitor"
EndSection

And change them to this:

Section "Monitor"
        Identifier      "Configured Monitor"
        DisplaySize     328 248
        HorizSync       30-85
        VertRefresh     50-120
EndSection




Section "Screen"
        Identifier      "Default Screen"
        Device          "Configured Video Device"
        Monitor         "Configured Monitor"
        DefaultDepth    16
        SubSection "Display"
                Depth           16
                Modes           "1280x1024" "1024x768"
        EndSubSection
        SubSection "Display"
                Depth           24
                Modes           "1280x1024" "1024x768"
        EndSubSection
EndSection

Get the values for hsync and vsync via:

xresprobe -n

and get the available modes via

fbset -x

http://wiki.ubuntuusers.de/XServer

[Rocket2DMn]

This HowTo is outdated now, it doesn't really apply to Hardy, Intrepid, or Jaunty (testing) - the newer X servers rely more on autodetection than they used to. These days, this method is mostly only useful to resetting a manually configured xorg.conf or one that was modified by restricted drivers, which can be useful after a kernel upgrade in which the restricted drivers were not recompiled after the update.

[arjanhs]

Is there already an updates version available, cause my 8.10 version with a Intel Corporation Mobile GM965/GL960 chipset isn't working with compiz.

Arjan

[komputes]

I completely understand that this is not an error. I expected to be able to select my video driver with this command. What I experienced is that this command skipped right over the part where it asks questions about the video driver and monitor refresh rates etc. How do I get to that screen?

[Rocket2DMn]

That command without phigh should ask about video drivers and screen resolutions. By default it should be asking low priority questions as well, but you can double check by using the "-plow" flag with the command. Otherwise, I need to see your xorg.conf file:

cat /etc/X11/xorg.conf
lspci | grep VGA