15.10beta trouble with suspend

Hi,

the powermode suspend (to ram) was working perfectly, reliably, fast and without any problem on my machine with 14.04.

It does not work properly with 15.10 beta anymore:

Doing a suspend through the Xubuntu menu drives the machine off. It can't restartet again and needs a fresh boot.

using pm-suspend puts the machine in a correct suspend mode, where the power led is blinking as expected, and even wakes up again, but the screen is not initialized correctly. It looks pink, severely distorted, contents moving. I can see something which remotely looks like the login window, but need a full reboot in order to make the screen work again correctly.

ProblemType: Bug
DistroRelease: Ubuntu 15.10
Package: pm-utils 1.4.1-15
ProcVersionSignature: Ubuntu 4.2.0-16.19-generic 4.2.3
Uname: Linux 4.2.0-16-generic x86_64
ApportVersion: 2.19.1-0ubuntu2
Architecture: amd64
CurrentDesktop: XFCE
Date: Sun Oct 18 01:44:29 2015
InstallationDate: Installed on 2015-10-08 (9 days ago)
InstallationMedia: Xubuntu 15.10 "Wily Werewolf" - Alpha amd64 (20150924)
PackageArchitecture: all
SourcePackage: pm-utils
UpgradeStatus: No upgrade log present (probably fresh install)