Display resolution keeps switching with external monitor connected
Submitted by Paweł Marczewski
Assigned to Xorg Project Team
Description
A fresh install of Ubuntu 11.10 on a Dell Vostro 3550 with all updates (OSS only - no proprietary drivers).
When connecting the laptop to an external monitor to extend my desktop the display settings are unstable. I choose to enable both the laptop panel, and the external monitor setting appropriate resolutions and apply settings. Sometimes the chosen settings do not "take". If they do apply, and I confirm that I want to keep the settings, at random intervals the display settings are auto-changed by the system. This may include:
- Resetting to "mirrored" displays at 1024x768
- Resetting to a single display on the laptop panel
- Resetting to a single display on the external monitor
- Some other weird combination.
E.g. When using my computer in a time range of 10 minutes i could get through 5 different dispositions and resolutions. It could be both display working fine, then only one but with wrong resolution, then the two again but with mirror, then just the second, and so on..
Bugs site from Launchpad https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/907381.
This same problem from ubuntu forum: http://ubuntuforums.org/showthread.php?p=11387749#post11387749
All user have this problem on Dell vostro 3550 with different graphic driver (radeon, intel)