mate-screensaver fails to disable X dpms and blanking

[arQon]

as a result, X blanks the screen after 10 minutes regardless of what the screensaver is told to do (ie "don't blank the screen").

$ ps ax |grep screensa
 1478 ? Sl 0:00 mate-screensaver

$ xset q
[snip]
Screen Saver:
  prefer blanking: yes allow exposures: yes
  timeout: 600 cycle: 600
DPMS (Energy Star):
  Standby: 600 Suspend: 600 Off: 600
  DPMS is Enabled
  Monitor is On

This worked correctly in 14.04 without needing the user to hack up a .xessionrc file.

ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: mate-screensaver 1.12.0-1
ProcVersionSignature: Ubuntu 4.4.0-116.140-generic 4.4.98
Uname: Linux 4.4.0-116-generic x86_64
ApportVersion: 2.20.1-0ubuntu2.15
Architecture: amd64
CurrentDesktop: MATE
Date: Mon Mar 19 09:28:17 2018
EcryptfsInUse: Yes
InstallationDate: Installed on 2015-04-29 (1055 days ago)
InstallationMedia: Ubuntu MATE 14.04.1 "Trusty Tahr" - final amd64 (20141111)
SourcePackage: mate-screensaver
UpgradeStatus: Upgraded to xenial on 2018-03-18 (1 days ago)

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[Bob Lawrence (pilotbob42)]

Behavior is still present in 18.04.1 LTS