[Bug 1054299] Re: screensaver doesn't hide screen during unsuspend

[Tormod Volden]

I can confirm this on xscreensaver 5.21 on Debian unstable with xfce as
well. The problem is that the xscreensaver daemon is told to lock the
screen only after the computer has woken up. Using xscreensaver -debug I
can see that it receives the THROTTLE ClientMessage before the sleep,
but the LOCK ClientMessage after the sleep.

/etc/acpi/sleep_suspend.sh calls /usr/share/acpi-support/screenblank
(which runs "xscreensaver-command -throttle" then "xscreensaver-command
-lock" in the background) just before running pm-suspend. Since the
locking is done in background it opens up for a race with pm-suspend,
which is faster nowadays.

Simply removing the backgrounding "&"'s in /usr/share/acpi-
support/screenblank solves the problem. The suspend process will now
take a bit longer of course, but resuming is faster.


** Package changed: xscreensaver (Ubuntu) => acpi-support (Ubuntu)

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https://bugs.launchpad.net/bugs/1054299

Title:
  screensaver doesn't hide screen during unsuspend

Status in “acpi-support” package in Ubuntu:
  Confirmed

Bug description:
  When coming out of suspend with a locked screen, the workspace is
  briefly visible, allowing anyone to see the contents. If sensitive or
  personal material is on the page, this can lead to data leaks.

  ProblemType: Bug
  DistroRelease: Ubuntu 12.10
  Package: xscreensaver 5.15-2ubuntu1
  ProcVersionSignature: Ubuntu 3.5.0-15.22-generic 3.5.4
  Uname: Linux 3.5.0-15-generic x86_64
  ApportVersion: 2.5.2-0ubuntu4
  Architecture: amd64
  Date: Fri Sep 21 14:19:33 2012
  InstallationMedia: Xubuntu 12.10 "Quantal Quetzal" - Alpha amd64 (20120919)
  ProcEnviron:
   LANGUAGE=en_US:en
   TERM=xterm
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  SourcePackage: xscreensaver
  UpgradeStatus: No upgrade log present (probably fresh install)

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