ubuntu-x-swat team mailing list archive

[Chris Halse Rogers <raof@xxxxxxxxxx>]

Ok.  There seem to be three different bugs here:

1) A wavy display when driving the external monitor at 1024x768.
 - I suspect that adding radeon.new_pll=0 (or radeon.new_pll=1) to GRUB_CMDLINE_LINUX_DEFAULT="quiet splash" and running update-grub will fix this, as this changes the algorithm for selecting the clock frequencies to drive the display at.

2) Looking in your Xorg.0.log it's apparent that when X starts up it is
unable to probe your external monitor correctly, and so falls back on
some standard mode options which is why X picks 1024x768 for both your
displays - it thinks this is the best mode they have in common.  This is
particularly strange because later in the log it's clear that it
successfully probes your external display.

3) When changing the monitor settings to extended desktop, something picks a mode that the monitor can't properly display.  I can't tell from your logs what settings you've tried to set, so it would be good to get a little more information here:
 * What tool are you using to enable extended desktop?  System→Preferences→Monitors?
 * What resolution are you specifying for the second monitor?
 * If the same behaviour occurs when you have Desktop Effects disabled.

** Changed in: xorg (Ubuntu)
       Status: New => Incomplete

-- 
system cannot display extended desktop on Samsung 2333sw
https://bugs.launchpad.net/bugs/664646
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