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The DELL XPS13 (9343) came with Ubuntu 14.04 factory preinstalled. But
it has too many bugs to be useful. In the meantime I have upgraded to
Ubuntu Mate 15.04 (Vivid) with kernel 3.19.0-18-generic.

The laptop has only a Mini-Displayport connector. So I use an adapter
for VGA and HDMI, a no-name 3-in-1, model# 27391 from German company
CSL.

When the window-manager is  "Marco (Simple desktop effects)" then I do
get a connection to an external monitor as it should be. However, Using
Marco results in a failure when resuming from suspend. (see bug report
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1454651)

When I use the window-manager "Compiz (Advanced GPU accelerated desktop
effects)" I get a proper resume from suspend, but connecting an external
monitor results in a black screen on both the internal and external
monitor. I can still see the mouse pointer moving across both screens,
but no desktop, no menus or anything clickable. Same problem for both an
external VGA or an external HDMI connection. Sometimes I do get a
picture on the external monitor, but with a few blank spots, and
everything is frozen, nothing can be clicked.

Switching to a terminal by CTRL-ALT-F1 still works, and gives a terminal
on the internal monitor.

So currently I can either have a working suspend, or a working external monitor, but not both.
--- 
ApportVersion: 2.17.2-0ubuntu1.1
Architecture: amd64
AudioDevicesInUse:
 USER        PID ACCESS COMMAND
 /dev/snd/controlC1:  ullix      1683 F.... pulseaudio
DistributionChannelDescriptor:
 # This is a distribution channel descriptor
 # For more information see http://wiki.ubuntu.com/DistributionChannelDescriptor
 canonical-oem-somerville-trusty-amd64-20140620-0
DistroRelease: Ubuntu 15.04
HibernationDevice: RESUME=UUID=7b6c248b-36d3-4dcf-9e9e-427d50206af6
InstallationDate: Installed on 2015-04-24 (30 days ago)
InstallationMedia: Ubuntu 14.04 "Trusty" - Build amd64 LIVE Binary 20140620-04:25
MachineType: Dell Inc. XPS 13 9343
NonfreeKernelModules: wl
Package: linux (not installed)
ProcFB: 0 inteldrmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.19.0-18-generic root=UUID=fda802ca-9257-4fed-bb0d-9f4756dca419 ro pcie_aspm=force radeon.modeset=0 plymouth:debug drm.debug=0xe nouveau.modeset=0 video.use_native_backlight=1 quiet splash pcie_aspm=force radeon.modeset=0 nouveau.modeset=0 video.use_native_backlight=1 "acpi_osi=Windows 2013"
ProcVersionSignature: Ubuntu 3.19.0-18.18-generic 3.19.6
RelatedPackageVersions:
 linux-restricted-modules-3.19.0-18-generic N/A
 linux-backports-modules-3.19.0-18-generic  N/A
 linux-firmware                             1.143.1
Tags:  vivid
Uname: Linux 3.19.0-18-generic x86_64
UpgradeStatus: Upgraded to vivid on 2015-05-23 (0 days ago)
UserGroups: adm audio cdrom dialout dip fax floppy fuse lpadmin netdev plugdev sambashare scanner sudo tape video
_MarkForUpload: True
dmi.bios.date: 03/25/2015
dmi.bios.vendor: Dell Inc.
dmi.bios.version: A03
dmi.board.name: 0TM99H
dmi.board.vendor: Dell Inc.
dmi.board.version: A00
dmi.chassis.type: 9
dmi.chassis.vendor: Dell Inc.
dmi.modalias: dmi:bvnDellInc.:bvrA03:bd03/25/2015:svnDellInc.:pnXPS139343:pvr01:rvnDellInc.:rn0TM99H:rvrA00:cvnDellInc.:ct9:cvr:
dmi.product.name: XPS 13 9343
dmi.product.version: 01
dmi.sys.vendor: Dell Inc.

** Affects: compiz (Ubuntu)
     Importance: High
         Status: Confirmed


** Tags: apport-collected vivid
-- 
Compiz on Ubuntu Mate 15.04 fails on DELL XPS 13 (9343) with external monitor 
https://bugs.launchpad.net/bugs/1458327
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