Full screen resolution not used on LC2440N Linux Certified laptop.

[Jeff Weston]

I am using a Linux Certified laptop, model # LC2440N [1]. The resolution supported by the display hardware is 1680x1050. On 6.10, my resolution was correctly detected. On 7.04, my resolution is set to 1024x768.

I tried following the instructions listed in the DebuggingXAutoconfiguration page [2], but I was unable to get my text console working.

[1] - http://www.linuxcertified.com/linux-laptop-lc2440n.html
[2] - https://help.ubuntu.com/community/DebuggingXAutoconfiguration

ProblemType: Bug
Architecture: i386
Date: Fri Mar 30 11:48:56 2007
DistroRelease: Ubuntu 7.04
Uname: Linux sodium 2.6.20-13-generic #2 SMP Sun Mar 25 00:21:25 UTC 2007 i686 GNU/Linux

[Timo Aaltonen (tjaalton)]

Please attach /var/log/casper.log from the livecd-session. Also, attach the output of 'sudo ddcprobe' and 'sudo xresprobe nv'.

[Timo Aaltonen (tjaalton)]

Does adding "1680x1050" manually to the xorg.conf help? If it does, please try a fresh daily livecd if it works better. It seems that xresprobe does find the correct resolution, but not when the X was set up by casper. This should now be fixed.

[Jeff Weston (jjweston)]

Adding "1680x1050" manually to the xorg.conf does help on my 7.04 Beta install. However, I just downloaded the Feisty i386 Desktop livecd for today [1] and the screen resolution is still coming back as 1024x768 when I boot using that livecd.

[1] - http://cdimage.ubuntu.com/daily-live/20070401/feisty-desktop-i386.iso

[Timo Aaltonen (tjaalton)]

In that case please attach casper.log from the new livecd... puzzling.

[Timo Aaltonen (tjaalton)]

Hrm, xresprobe still doesn't work with casper. Wonder what's going on here..

[Timo Aaltonen (tjaalton)]

I'm marking this confirmed.. If it magically works in gutsy again, please report back. Otherwise I have no ideas, and xresprobe should be deprecated in a future release anyway.

[Bryce Harrington (bryce)]

Is this a dupe of 94994? ddcprobe is failing to return edid data.