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Description of problem: When trying to enable an external monitor in addition to the built-in display of my Dell D830, the desktop locks up. The built-in display has a resolution of 1680x1050, the external monitor has a resolution of 1920x1080. Their highest common resolution is 1280x1024. The monitor make, type and resolution is auto-detected. I can configure these displays in their full resolution, with the external monitor above the built-in display, both in KDE and in openbox. But I'd prefer to use Xfce if I could get it to support my displays properly. Version-Release number of selected component (if applicable): How reproducible: Steps to Reproduce: 1. Log into the Xfce desktop. 2. Use the menu on the panel to activate applications menu->preferences->Display . The built-in display is shown as 'on' 3. Select the external monitor, and set it to 'on', too. Actual results: A popup window appears with warning: Selected output not disabled The selected output must not be disabled, the system would be unusable. Any attempt to acknowledge or close this popup window is rewarded with some flickering and the same popup appearing again. The Desktop is indeed unusable till the system is rebooted. Expected results: The external monitor is enabled in addition to the built-in display, and some means to arrange the relative location of the displays is provided. Additional info:
Please attach ~/.xsession-errors and /var/log/Xlog.0.log from a session where this happens? What video card and driver?
Created attachment 530021 [details] gzipped tar of logfiles I logged into openbox, saw the bugzilla email, logged out and logged into xfce to reproduce the problem, tried the 'close' button of the popups three times, then switched to a virtual console to log in as root and tar up the log files.
This laptop has integrated i915 graphics. From /var/log/boot.log: Oct 25 08:30:45 helva kernel: [ 2.733874] NX-protecting the kernel data: 4080k Oct 25 08:30:45 helva kernel: [ 2.838126] [drm] Initialized drm 1.1.0 20060810 Oct 25 08:30:45 helva kernel: [ 2.847694] i915 0000:00:02.0: PCI INT A -> GSI 16 (level, low) -> IRQ 16 Oct 25 08:30:45 helva kernel: [ 2.865883] [drm] Supports vblank timestamp caching Rev 1 (10.10.2010). Oct 25 08:30:45 helva kernel: [ 2.865885] [drm] Driver supports precise vblank timestamp query. Oct 25 08:30:45 helva kernel: [ 2.865927] vgaarb: device changed decodes: PCI:0000:00:02.0,olddecodes=io+mem,decodes=io+mem:owns=io+mem Oct 25 08:30:45 helva kernel: [ 2.926038] usb 6-2: device descriptor read/64, error -71 Oct 25 08:30:45 helva kernel: [ 3.129229] usb 6-2: new full speed USB device number 3 using uhci_hcd Oct 25 08:30:45 helva kernel: [ 3.241229] usb 6-2: device descriptor read/64, error -71 Oct 25 08:30:45 helva kernel: [ 3.317144] [drm] initialized overlay support Oct 25 08:30:45 helva kernel: [ 3.454236] usb 6-2: device descriptor read/64, error -71 Oct 25 08:30:45 helva kernel: [ 3.529152] fbcon: inteldrmfb (fb0) is primary device Oct 25 08:30:45 helva kernel: [ 3.657041] usb 6-2: new full speed USB device number 4 using uhci_hcd Oct 25 08:30:45 helva kernel: [ 3.672605] Console: switching to colour frame buffer device 210x65 Oct 25 08:30:45 helva kernel: [ 3.681427] fb0: inteldrmfb frame buffer device Oct 25 08:30:45 helva kernel: [ 3.681429] drm: registered panic notifier Oct 25 08:30:45 helva kernel: [ 3.682016] input: Video Bus as /devices/LNXSYSTM:00/device:00/PNP0A03:00/LNXVIDEO:01/input/input6 Oct 25 08:30:45 helva kernel: [ 3.682067] ACPI: Video Device [VID1] (multi-head: yes rom: no post: no) Oct 25 08:30:45 helva kernel: [ 3.682083] [Firmware Bug]: Duplicate ACPI video bus devices for the same VGA controller, please try module parameter "video.allow_duplicates=1"if the current driver doesn't work. Oct 25 08:30:45 helva kernel: [ 3.682113] [drm] Initialized i915 1.6.0 20080730 for 0000:00:02.0 on minor 0 Oct 25 08:30:45 helva kernel: [ 4.065046] usb 6-2: device not accepting address 4, error -71
(In reply to comment #3) > This laptop has integrated i915 graphics. From /var/log/boot.log: Oops, I meant /var/log/messages .
Looks like a intel X driver issue. See: [ 1003.588] (EE) intel(0): failed to set mode: Invalid argument in the X log. It's not able to set the mode with both monitors active. ;(
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