[Bug 1309744] Re: [SRU] Light Locker blanks the screen when playing video

[John Hupp]

With a fully patched Lubuntu Trusty, streaming Flash video through
Firefox results in the screen blanking and locking after 10 minutes.

I have the recommended/most-recent version of xdg-utils.

Does this mean that media players in general use xdg-screensaver to
inhibit the screensaver while playing video, but that Firefox does not?

If so, is there a workaround?

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https://bugs.launchpad.net/bugs/1309744

Title:
  [SRU] Light Locker blanks the screen when playing video

Status in “xdg-utils” package in Ubuntu:
  Fix Released
Status in “xdg-utils” source package in Trusty:
  Fix Released

Bug description:
  Problem description
  ---

  Expected behaviour:
  When playing back videos in fullscreen mode in Xubuntu's, the X11 screensaver should be inhibited. (Xubuntu previously used XScreensaver.)

  Behaviour:
  The screensaver blanks the screen (after the timeout that the user defined in light-locker-settings, by default 10mins) despite the video playing in fullscreen.

  [Test Case]
  Play back a video file in Parole with screenblanking enabled (can be checked with "xset q | grep timeout").

  [Regression potential]
  None apparent, tested in Trusty.

  [Other Info]
  A little background: this problem became apparent only in Trusty with the switch from XScreensaver to light-locker. As light-locker doesn't handle screenblanking itself but instead relies on X11's builtin screensaver (aka MIT screensaver extension), it needs xdg-utils/screensaver's support for inhibiting the blanking. For some reason, xdg-screensaver doesn't support controlling X11's screensaver extension in Xfce, probably for historical reasons (e.g. most distros with Xfce use XScreensaver).

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: vlc 2.1.2-2build2
  ProcVersionSignature: Ubuntu 3.13.0-20.42-generic 3.13.7
  Uname: Linux 3.13.0-20-generic x86_64
  NonfreeKernelModules: fglrx
  ApportVersion: 2.14.1-0ubuntu3
  Architecture: amd64
  CurrentDesktop: XFCE
  Date: Fri Apr 18 15:41:48 2014
  InstallationDate: Installed on 2014-03-31 (18 days ago)
  InstallationMedia: Xubuntu 14.04 LTS "Trusty Tahr" - Beta amd64 (20140326)
  SourcePackage: vlc
  UpgradeStatus: No upgrade log present (probably fresh install)

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