Am Dienstag, den 11.08.2009, 11:14 -0400 schrieb Geir Ove Myhr: > With KMS the current behaviour is even more unfortunate, since one of > its advantages is fewer mode changes. Currently, the monitors are > assigned their native resolution on boot and then changes to the lower > resolution once gdm starts. If the monitors are set up to be used with > an extended desktop the mode changes again when the user logs in. > > 1. In which xorg component did this change occur? > 2. Is there any record of the rationale behind this change? > 3. What do you think would be the proper behaviour?
I found the commit that implemented this behaviour in hw/xfree86/modes/xf86Crtc.c: http://lists.freedesktop.org/archives/xorg-commit/2008-March/015045.html | commit 27e7dacbf7ef17712be31ff90f98ee3a5c5cf909 | Author: Adam Jackson <ajax at redhat.com> | Date: Tue Mar 4 11:38:34 2008 -0500 | | Make xf86InitialConfiguration slightly smarter. | | Old heuristic was to find the first monitor that expressed a | preference, then attempt to get all other monitors to agree. This | doesn't work particularly well when the two sets of modes don't | precisely intersect, you get overlapping-but-not-identical output | geometry and things go wrong. | | New heuristic is: | - Exact user preference, if given | - Exact output preference, if the same for all outputs | - Best (largest) mode of modes common to all outputs: | - with the same aspect ratio as all outputs (may be NULL) | - with 4:3 aspect ratio | - Then the old heuristic to try to get something lit | | Note that it is simply not doable to have a reliable initial output | guess if you insist on trying to clone all outputs together. It's far | too easy to end up with displays that simply don't have modes in | common. We need to switch to right-of placement someday, once we're | not limited to CRTC size limits and we have working multi-GPU in | RANDR. -- Ubuntu-x mailing list [email protected] Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-x
