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[bobbaer <bobbaer@xxxxxxxx>]

confirming this affect me too:

uname -a
Linux karoushi 3.16.0-24-generic #32-Ubuntu SMP Tue Oct 28 13:07:32 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux
Description:	Ubuntu 14.10

suspend itself works fine
Laptop: SONY VAIO VPCCB3S1E (Intel(R) Core(TM) i5-2430M CPU @ 2.40GHz, with additional  [AMD/ATI] Whistler [Radeon HD 6630M/6650M/6750M/7670M/7690M] )

using XFCE POwerManager  with xscreensaver.

* system upgraded from 14.01
* created new user to exclude possibility of old configuration files messing up something to no avail
* to make suspend work changes in /etc/systemd/logind.conf
HandlePowerKey=ignore
HandleSuspendKey=ignore
HandleHibernateKey=ignore
HandleLidSwitch=ignore
* Fixes didn't work in 14.04* already

Workarounds as described either
1. type blind, open terminal with shortcut and enter xrandr --auto or
2. suspend before closing the lid (e.g. powerbutton)

Also: happens only with internal Monitor, if external is 
connected (here HDMI), only LVDS remains black.

Tried with upstream Kernel (daily, had issues with rc2)
linux-image-3.18.0-999-generic_3.18.0-999.201410290205_amd64.deb
but problem still exists.

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https://bugs.launchpad.net/bugs/1385926

Title:
  [Dell Latitude D400] Black screen on resume after suspend by lid close
  persists in Xubuntu 14.10

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  Closing the lid does not activate a clean suspend and results in black
  screen with frozen cursor upon re-opening the lid in Xubuntu 14.10 and
  upgraded from 14.04.1. Once black screen mode is invoked, the only
  recourse is power off re-boot. Suspend by lid close worked correctly
  in Xubuntu 12.04.

  Fix reported http://xubuntu.org/news/laptop-users-fix-available-for-
  the-black-screen-on-unlock-bug/ does not apply.

  WORKAROUND: Suspend via menus or keyboard before closing lid.

  ---
  ApportVersion: 2.14.7-0ubuntu8
  Architecture: i386
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  chezcampbell   2171 F.... pulseaudio
  CurrentDesktop: XFCE
  DistroRelease: Ubuntu 14.10
  HibernationDevice: RESUME=UUID=504c20f7-bda6-4b15-ac0a-d5c9021f07c4
  InstallationDate: Installed on 2014-08-14 (73 days ago)
  InstallationMedia: Xubuntu 14.04.1 LTS "Trusty Tahr" - Release i386 (20140723)
  Lsusb:
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
   Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
   Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
   Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub
  MachineType: Dell Computer Corporation Latitude D400
  Package: linux (not installed)
  PccardctlIdent:
   Socket 0:
     no product info available
   Socket 1:
     no product info available
  PccardctlStatus:
   Socket 0:
     no card
   Socket 1:
     no card
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-3.16.0-23-generic root=UUID=b11ff414-9135-4c64-bf12-3cdc8bfeed18 ro forcepae quiet splash vt.handoff=7
  ProcVersionSignature: Ubuntu 3.16.0-23.31-generic 3.16.4
  RelatedPackageVersions:
   linux-restricted-modules-3.16.0-23-generic N/A
   linux-backports-modules-3.16.0-23-generic  N/A
   linux-firmware                             1.138
  RfKill:
   0: phy0: Wireless LAN
    Soft blocked: no
    Hard blocked: no
  Tags:  utopic
  Uname: Linux 3.16.0-23-generic i686
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
  _MarkForUpload: True
  dmi.bios.date: 06/28/2005
  dmi.bios.vendor: Dell Computer Corporation
  dmi.bios.version: A08
  dmi.board.name: 0W0327
  dmi.board.vendor: Dell Computer Corporation
  dmi.chassis.type: 8
  dmi.chassis.vendor: Dell Computer Corporation
  dmi.modalias: dmi:bvnDellComputerCorporation:bvrA08:bd06/28/2005:svnDellComputerCorporation:pnLatitudeD400:pvr:rvnDellComputerCorporation:rn0W0327:rvr:cvnDellComputerCorporation:ct8:cvr:
  dmi.product.name: Latitude D400
  dmi.sys.vendor: Dell Computer Corporation

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