Hi ricardisimo,
Have you had luck getting a good screenshot or photo from the other
system so far?
A couple things I'd like to clarify:
First, does the corruption go away if you set your resolution to the
same as the person you're changing from? I.e., does the problem depend
on switching users with different resolutions, or does it occur for
switching users at all? Does it happen both ways - if you switch from
your high resolution setup to one of the two lower resolution ones, do
you also see the corruption?
Second, does the corruption only occur on the X display, or does it also
appear on the login screen?
Third, I notice in your xorg.conf you have this set:
Option "UseFBDev" "true"
If that's set to "false" what happens? I notice in your Xorg.0.log file
that it's hitting errors when trying to activate the framebuffer:
(II) Loading sub module "fbdevhw"
(II) LoadModule: "fbdevhw"
(II) Loading /usr/lib/xorg/modules/linux//libfbdevhw.so
(II) Module fbdevhw: vendor="X.Org Foundation"
compiled for 7.2.0, module version = 0.0.2
ABI class: X.Org Video Driver, version 1.1
(WW) open /dev/fb0: No such file or directory
(WW) open /dev/fb1: No such file or directory
(WW) open /dev/fb2: No such file or directory
(WW) open /dev/fb3: No such file or directory
(WW) open /dev/fb4: No such file or directory
(WW) open /dev/fb5: No such file or directory
(WW) open /dev/fb6: No such file or directory
(WW) open /dev/fb7: No such file or directory
(EE) Unable to find a valid framebuffer device
(EE) RADEON(0): Failed to open framebuffer device, consult warnings and/or
errors above for possible reasons
(you may have to look at the server log to see warnings)
(WW) RADEON(0): fbdevHWInit failed, not using framebuffer device
So that option isn't working. I'm guessing that disabiling it will have
no substantial effect, but the corruption-when-switching sounds sort of
frambufferish, so it's worth trying.
Fwiw, I doubt it has anything to do with your monitors. Since it occurs
when logging out and back in, but not when doing Switch User, it makes
me suspect something related to the login screen / framebuffer / gdm
layer.
** Changed in: xorg (Ubuntu)
Importance: Undecided => Medium
--
Graphics problem when users have different screen resolutions
https://bugs.launchpad.net/bugs/117638
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