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

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