Monitor misdetected (ThinkPad X41 Tablet)

[Sven Herzberg]

I was running dpkg-reconfigure xserver-xorg as mjg suggested some days ago to get my wacom tablet running again.

Afterwards the X server did only work in 640x480.

from Xorg.conf:
Section "Monitor"
 Identifier "Standardbildschirm"
 Option "DPMS"
 HorizSync 28-33
 VertRefresh 43-72
EndSection

# /bin/egrep -i sync\|refresh /var/log/Xorg.0.log
(II) Loading extension SYNC
        No refresh rate overrides will be attempted.
(II) I810(0): Standardbildschirm: Using hsync range of 43.89-48.51 kHz
(II) I810(0): Standardbildschirm: Using vrefresh value of 60.00 Hz

The second data is from running a modified xorg.conf (I deleted the HorizSync and VertRefresh lines only).

[Fabio Massimo Di Nitto (fabbione)]

Did you run dpkg-reconfigure from within X?

Fabio

[Fabio Massimo Di Nitto (fabbione)]

Sven can you please provide the information requested?

Thanks
Fabio

[Sven Herzberg (herzi)]

Yes, I did run it from within X.

[Rodrigo Novo (rodarvus)]

Sven,

please re-run dpkg-reconfigure after exiting your session, and stopping the gdm service. (sudo invoke-rc.d gdm stop)

This step is supposed to fix your setup. If it doesn't, please follow the steps described at https://help.ubuntu.com/community/DebuggingXAutoconfiguration, and attach the output of the requested files in this bug report.

Thank you in advance for the feedback!

[Bryce Harrington (bryce)]

This is a known issue - the ubuntu xorg setup scripts mis-detect monitors and then just use a generic default for the monitor's h sync and v refresh rates.

The work around is to change these numbers in /etc/X11/xorg.conf to the correct ones for your monitor. In this case:

  HorizSync 43.89-48.51
  VertRefresh 60

If that doesn't work, if you're using Feisty you could also try simply moving xorg.conf aside and restarting X, and see if it auto-detects the settings properly. (I'd be very interested to hear either way.

In any case, this seems to be a dupe of 3731 - marking as such.

[Launchpad Janitor (janitor)]

[Expired for xorg (Ubuntu) because there has been no activity for 60 days.]