Thanks for attaching the dmesg output with debugging turned on. Looking through it I do notice this bit which looks possibly complicit in this issue:
[ 515.630872] [drm:intel_prepare_page_flip], preparing flip with no unpin work? [ 515.683339] [drm:intel_wait_for_vblank], vblank wait timed out [ 515.683439] [drm:drm_crtc_helper_set_config], [ 515.683445] [drm:drm_crtc_helper_set_config], [CRTC:4] [NOFB] [ 515.683457] [drm:drm_crtc_helper_set_config], [CONNECTOR:5:LVDS-1] to [CRTC:3] [ 515.683463] [drm:drm_crtc_helper_set_config], crtc changed, full mode switch [ 515.683468] [drm:drm_crtc_helper_set_config], [CONNECTOR:11:VGA-1] to [NOCRTC] [ 515.692792] [drm:intel_crtc_cursor_set], [ 515.699776] [drm:i915_get_vblank_timestamp], crtc 1 is disabled [ 515.716486] [drm:i915_get_vblank_timestamp], crtc 1 is disabled [ 515.733167] [drm:i915_get_vblank_timestamp], crtc 1 is disabled ... Those crtc 1 disabled messages go on for almost 20 seconds, so I presume this sequence corresponds to when your screen was blanked. Looks like at that point the LVDS was mapped to crtc 3; perhaps X was expecting it on crtc 1 instead and started issuing the warnings when it didn't find it there. Would you be willing to do a quick check that this same behavior occurs in Ubuntu Precise? It should be sufficient to boot a Live USB session, configure the monitors, and see if it is working properly now. You can get the current Live USB desktop image at http://cdimage.ubuntu.com /daily-live/current/ and create a USB boot drive using usb-creator. ** Changed in: xorg-server (Ubuntu) Status: New => Incomplete -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to gnome-control-center in Ubuntu. https://bugs.launchpad.net/bugs/840974 Title: configuration of external monitor on laptop does not work properly Status in “gnome-control-center” package in Ubuntu: Confirmed Status in “xorg-server” package in Ubuntu: Incomplete Bug description: During test of Oneiric Beta 1 on my HP-G62 laptop testcase: http://testcases.qa.ubuntu.com/Hardware/GFX/ExternalPrimary I have this problem on configuration of external attached monitor: After powering on my laptop with an external monitor attached, when I unclick the duplicate check box and work only with the external monitor, when you try to turn the laptop monitor on again it just remains black and only the external one works, can't get it back working, it works only if you check the duplicate check box again, but you can't switch off the external monitor and work with the laptop one if the external one is attached. ProblemType: Bug DistroRelease: Ubuntu 11.10 Package: gnome-control-center 1:3.1.5-0ubuntu4 ProcVersionSignature: Ubuntu 3.0.0-9.15-generic 3.0.3 Uname: Linux 3.0.0-9-generic x86_64 Architecture: amd64 Date: Sun Sep 4 14:40:31 2011 ExecutablePath: /usr/bin/gnome-control-center InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Beta amd64 (20110901) ProcEnviron: PATH=(custom, no user) LANG=it_IT.UTF-8 SHELL=/bin/bash SourcePackage: gnome-control-center UpgradeStatus: No upgrade log present (probably fresh install) To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/gnome-control-center/+bug/840974/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : [email protected] Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
