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I've installed 15.10 beta on a brand new ASRock beebox N3150 PC. This
device has three display connectors, 1x DisplayPort, 2xHDMI. I'm having
a Display with 2560x1600, and thus want to use with with DisplayPort for
full resolution.

When connecting screen and PC with DisplayPort, both the BIOS and the
Linux BootSplash/Console correctly recognize the screen to be connected
to DisplayPort and are displayed as usual. But as soon as X starts,
screen becomes black (and the screen itself somewhat confused, because
it does not even respond to the menu button anymore). Interestingly, the
same screen worked properly when connected with DisplayPort to another
Linux machine with 14.04.

Connecting the screen with HDMI instead works without any problems, but gives a reduced resolution of 1920x1080 only.
--- 
ApportVersion: 2.19.1-0ubuntu2
Architecture: amd64
BootLog:
 
CompizPlugins: No value set for `/apps/compiz-1/general/screen0/options/active_plugins'
CompositorRunning: None
CurrentDesktop: XFCE
DistUpgraded: Fresh install
DistroCodename: wily
DistroRelease: Ubuntu 15.10
DistroVariant: ubuntu
DkmsStatus:
 virtualbox, 5.0.4, 4.2.0-14-generic, x86_64: installed
 virtualbox, 5.0.4, 4.2.0-16-generic, x86_64: installed
ExtraDebuggingInterest: Yes, if not too technical
GraphicsCard:
 Intel Corporation Device [8086:22b1] (rev 21) (prog-if 00 [VGA controller])
   Subsystem: ASRock Incorporation Device [1849:22b1]
InstallationDate: Installed on 2015-09-03 (45 days ago)
InstallationMedia: Xubuntu 15.10 "Wily Werewolf" - Alpha amd64 (20150825)
LightdmGreeterLog:
 ** Message: Starting lightdm-gtk-greeter 2.0.1 (Aug  7 2015, 01:24:18)
 ** Message: [Configuration] Reading file: /etc/lightdm/lightdm-gtk-greeter.conf.d/01_ubuntu.conf
 ** Message: [Configuration] Reading file: /etc/lightdm/lightdm-gtk-greeter.conf.d/30_xubuntu.conf
 ** Message: [Configuration] Reading file: /etc/lightdm/lightdm-gtk-greeter.conf
 Invalid MIT-MAGIC-COOKIE-1 keyupstart: indicator-application main process (1991) killed by TERM signal
LightdmGreeterLogOld:
 ** Message: Starting lightdm-gtk-greeter 2.0.1 (Aug  7 2015, 01:24:18)
 ** Message: [Configuration] Reading file: /etc/lightdm/lightdm-gtk-greeter.conf.d/01_ubuntu.conf
 ** Message: [Configuration] Reading file: /etc/lightdm/lightdm-gtk-greeter.conf.d/30_xubuntu.conf
 ** Message: [Configuration] Reading file: /etc/lightdm/lightdm-gtk-greeter.conf
 upstart: indicator-application main process (1537) killed by TERM signal
Lsusb:
 Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
 Bus 001 Device 004: ID 0bda:0821 Realtek Semiconductor Corp. 
 Bus 001 Device 003: ID 046d:c05a Logitech, Inc. M90/M100 Optical Mouse
 Bus 001 Device 002: ID 046d:c31d Logitech, Inc. Media Keyboard K200
 Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
MachineType: To Be Filled By O.E.M. To Be Filled By O.E.M.
Package: xorg 1:7.7+7ubuntu4
PackageArchitecture: amd64
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.2.0-16-generic root=UUID=881c90c8-ac82-4df6-98d7-83045b0f9c1b ro rootflags=subvol=@ quiet splash vt.handoff=7
ProcVersionSignature: Ubuntu 4.2.0-16.19-generic 4.2.3
Tags:  wily ubuntu
UdevLog: Error: [Errno 2] Datei oder Verzeichnis nicht gefunden: '/var/log/udev'
Uname: Linux 4.2.0-16-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip libvirtd lpadmin plugdev sambashare scanner sudo video www-data
_MarkForUpload: True
dmi.bios.date: 07/16/2015
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: P1.10
dmi.board.name: N3150-NUC
dmi.board.vendor: ASRock
dmi.chassis.asset.tag: To Be Filled By O.E.M.
dmi.chassis.type: 3
dmi.chassis.vendor: To Be Filled By O.E.M.
dmi.chassis.version: To Be Filled By O.E.M.
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrP1.10:bd07/16/2015:svnToBeFilledByO.E.M.:pnToBeFilledByO.E.M.:pvrToBeFilledByO.E.M.:rvnASRock:rnN3150-NUC:rvr:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.:
dmi.product.name: To Be Filled By O.E.M.
dmi.product.version: To Be Filled By O.E.M.
dmi.sys.vendor: To Be Filled By O.E.M.
version.compiz: compiz N/A
version.ia32-libs: ia32-libs N/A
version.libdrm2: libdrm2 2.4.64-1
version.libgl1-mesa-dri: libgl1-mesa-dri 11.0.2-1ubuntu4
version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
version.libgl1-mesa-glx: libgl1-mesa-glx 11.0.2-1ubuntu4
version.xserver-xorg-core: xserver-xorg-core 2:1.17.2-1ubuntu9
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.9.2-1ubuntu1
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.5.0+git20150819-0ubuntu1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917+git20150808-0ubuntu4
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.11-1ubuntu3
xserver.bootTime: Mon Oct 19 09:19:29 2015
xserver.configfile: default
xserver.errors:
 
xserver.logfile: /var/log/Xorg.0.log
xserver.outputs:
 
xserver.version: 2:1.17.2-1ubuntu9

** Affects: linux (Ubuntu)
     Importance: Medium
         Status: Incomplete


** Tags: amd64 apport-bug apport-collected latest-bios-1.10 ubuntu wily
-- 
Trouble with DisplayPort
https://bugs.launchpad.net/bugs/1503590
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