Public bug reported:
On my Dell Latitude D630 running Kubuntu 11.10 (Linux 3.0, Xorg 1.10.4),
when cycling through multi-monitor set-ups either using [Fn][F8] but
also using the config tool) after some flickering it changes to "only
external monitor (internal monitor disabled)". However, after 10 to 30
seconds the system starts to slow down and the monitor setup reverts
back to "clone" (I see the same screen on both displays).
In /var/log/syslog, I can trace that behaviour (# marks comments):
# pressing Fn+F8 to change the monitor setup
[ 1109.036386] composite sync not supported
# message is repeated 30 times until timestamp 1119.174609 then the change
# is performed, but then 30 secs later, the system starts to slow down and
# I start to get the message again:
[ 1159.442640] composite sync not supported
# message is repeated 15 times until 1162.603256, during which the X.org
# setup is reverted to clone (I see the same screen on both displays)
In my /var/log/Xorg.0.log, I get similar results:
# pressing Fn+F8 to change the monitor setup
[ 1109.022] (II) PM Event received: Capability Changed
[ 1109.022] I830PMEvent: Capability change
[ 1109.036] (II) intel(0): EDID vendor "AUO", prod id 4935
[ 1109.036] (II) intel(0): DDCModeFromDetailedTiming: 1440x900 Warning: We
only handle separate sync.
[ 1109.036] (II) intel(0): Printing DDC gathered Modelines:
[ 1109.036] (II) intel(0): Modeline "1440x900"x0.0 96.30 1440 1504 1536
1760 900 903 906 912 -hsync -vsync (54.7 kHz)
[ 1109.036] (II) intel(0): Modeline "1440x900"x0.0 80.26 1440 1504 1536
1760 900 903 906 912 -hsync -vsync (45.6 kHz)
# previous 5 lines are repeated ~30 times over the next 7 seconds , then I
get:
[ 1119.231] (II) intel(0): EDID vendor "NEC", prod id 26429
[ 1119.231] (II) intel(0): Using hsync ranges from config file
[ 1119.231] (II) intel(0): Using vrefresh ranges from config file
[ 1119.231] (II) intel(0): Printing DDC gathered Modelines:
[ 1119.231] (II) intel(0): Modeline "1680x1050"x0.0 146.25 1680 1960 2136
2240 1050 1053 1059 1089 -hsync +vsync (65.3 kHz)
# (...) a couple of more modelines, this is again repeated for some copies,
then
# the monitor setup is changed, then there are five other copies starting
from
# timestamp 1159.... and it reverts back again, printing:
[ 1162.603] (II) intel(0): EDID vendor "AUO", prod id 4935
[ 1162.603] (II) intel(0): DDCModeFromDetailedTiming: 1440x900 Warning: We
only handle separate sync.
[ 1162.603] (II) intel(0): Printing DDC gathered Modelines:
# etc...
I also experience that behaviour when changing the monitor set-up
through the KDE control centre, however less frequenty.
xorg package version:
Installed: 1:7.6+7ubuntu7.1
ProblemType: Bug
DistroRelease: Ubuntu 11.10
Package: xorg 1:7.6+7ubuntu7.1
ProcVersionSignature: Ubuntu 3.0.0-17.30-generic 3.0.22
Uname: Linux 3.0.0-17-generic x86_64
ApportVersion: 1.23-0ubuntu4
Architecture: amd64
Date: Sun Apr 22 14:23:18 2012
InstallationMedia: Kubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012)
SourcePackage: xorg
UpgradeStatus: No upgrade log present (probably fresh install)
** Affects: xorg (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 oneiric
--
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which is subscribed to xorg in Ubuntu.
https://bugs.launchpad.net/bugs/986838
Title:
Multi-monitor setup reverts back automatically after a few seconds
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