Re: [Debian-User] Re: [Debian-User] Re: Display image after resume

[Jim Popovitch]

On Tue, 2018-06-05 at 13:06 +1200, Ben Caradoc-Davies wrote:
> On 04/06/18 16:39, Jim Popovitch wrote:
> > On Mon, 2018-06-04 at 11:07 +1200, Ben Caradoc-Davies wrote:
> > > On 04/06/18 10:03, Jim Popovitch wrote:
> > > > What produces the desktop image that is displayed immediately
> > > > after
> > > > resuming from hibernation?
> > > > When resuming, I see the following in order:
> > > > 1. the boot screen
> > > > 2. a blank screen
> > > > 3. the actual desktop (live or a snapshot of it)
> > > > 4. the lockscreen password prompt
> > > > What I would like to do is prevent the actual desktop, or the
> > > > screenshot of it, from appearing after the system boots from
> > > > hibernation.
> > > 
> > > - What is your desktop?
> > 
> > Stretch Cinnamon
> > > - Are you using systemd?
> > 
> > Yes, but that is not an admission of preferring systemd. ;-)
> > > - How do you initiate hibernation? Via the desktop or via a
> > > keyboard
> > > or chassis button?
> > 
> > By closing the lid, it's a laptop (asus zenbook)
> > > - Which screen locker do you use? (e.g. light-locker or
> > > xscreensaver?)
> > 
> > cinnamon-screensaver
> > > This looks like a race condition in which system is hibernated
> > > before your screen is locked. I saw this for suspend when I let
> > > systemd manage my power button. My solution was to
> > > edit/etc/systemd/logind.conf to set HandlePowerKey=ignore and to
> > > let
> > > Xfce handle locking and suspend and Xfce Power Manager / Security
> > > /
> > > "Lock screen when system is going for sleep"). I use
> > > xscreensaver.
> > 
> > I think you're on to something.  When I CTRL+ATL+L the system, and
> > then
> > close the lid, the post-hibernation resume works correctly (no
> > screen
> > leakage).  Unfortunately changing the systemd login settings didn't
> > seem to have any effect.  I'm comfortable not using systemd on
> > servers,
> > is it just as straight forward without it on desktops/laptops?
> 
> I assume that after changing logind.conf you restarted (or similar)
> to reload your configuration.

Yes.  I tried reloading systemd, and then tried rebooting.

> 
> What are your values of these logind.conf settings (commented
> defaults 
> listed)?:
> 
> #HandleLidSwitch=suspend
> #HandleLidSwitchExternalPower=suspend
> #HandleLidSwitchDocked=ignore

Everything in my default logind.conf file was commented out. Based on
your feedback I set these keys+vals but the desktop leakage still
occurs. :-(

HandlePowerKey=ignore
HandleLidSwitch=ignore
HandleLidSwitchDocked=ignore
HandleLidSwitchExternalPower=ignore


> I have not used it, but you might investigate xss-lock to trigger a 
> screen lock based on a systemd hibernate event. Cinammon should do
> this for you, but it seems that it does not.
 
Thanks, I'll try xss-lock and look into filing a cinnamon bug.

Thanks for the help with this.

-Jim P.



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Re: [Debian-User] Re: Display image after resume

[Ben Caradoc-Davies]

On 04/06/18 16:39, Jim Popovitch wrote:

On Mon, 2018-06-04 at 11:07 +1200, Ben Caradoc-Davies wrote:

On 04/06/18 10:03, Jim Popovitch wrote:

What produces the desktop image that is displayed immediately after
resuming from hibernation?
When resuming, I see the following in order:
    1. the boot screen
    2. a blank screen
    3. the actual desktop (live or a snapshot of it)
    4. the lockscreen password prompt
What I would like to do is prevent the actual desktop, or the
screenshot of it, from appearing after the system boots from
hibernation.

- What is your desktop?

Stretch Cinnamon

- Are you using systemd?

Yes, but that is not an admission of preferring systemd. ;-)

- How do you initiate hibernation? Via the desktop or via a keyboard
or chassis button?

By closing the lid, it's a laptop (asus zenbook)

- Which screen locker do you use? (e.g. light-locker or
xscreensaver?)

cinnamon-screensaver

This looks like a race condition in which system is hibernated
before your screen is locked. I saw this for suspend when I let
systemd manage my power button. My solution was to
edit/etc/systemd/logind.conf to set HandlePowerKey=ignore and to let
Xfce handle locking and suspend and Xfce Power Manager / Security /
"Lock screen when system is going for sleep"). I use xscreensaver.

I think you're on to something.  When I CTRL+ATL+L the system, and then
close the lid, the post-hibernation resume works correctly (no screen
leakage).  Unfortunately changing the systemd login settings didn't
seem to have any effect.  I'm comfortable not using systemd on servers,
is it just as straight forward without it on desktops/laptops?


I assume that after changing logind.conf you restarted (or similar) to 
reload your configuration.


What are your values of these logind.conf settings (commented defaults 
listed)?:


#HandleLidSwitch=suspend
#HandleLidSwitchExternalPower=suspend
#HandleLidSwitchDocked=ignore

I have not used it, but you might investigate xss-lock to trigger a 
screen lock based on a systemd hibernate event. Cinammon should do this 
for you, but it seems that it does not.


Kind regards,

--
Ben Caradoc-Davies 
Director
Transient Software Limited 
New Zealand

Re: [Debian-User] Re: Display image after resume

[Jim Popovitch]

-BEGIN PGP SIGNED MESSAGE-
Hash: SHA512

On Mon, 2018-06-04 at 11:07 +1200, Ben Caradoc-Davies wrote:
> On 04/06/18 10:03, Jim Popovitch wrote:
> > What produces the desktop image that is displayed immediately after
> > resuming from hibernation?
> > When resuming, I see the following in order:
> >    1. the boot screen
> >    2. a blank screen
> >    3. the actual desktop (live or a snapshot of it)
> >    4. the lockscreen password prompt
> > What I would like to do is prevent the actual desktop, or the
> > screenshot of it, from appearing after the system boots from
> > hibernation.
> > -Jim P.
> 
> - What is your desktop?

Stretch Cinnamon

> - Are you using systemd?

Yes, but that is not an admission of preferring systemd. ;-)

> - How do you initiate hibernation? Via the desktop or via a keyboard
> or chassis button?

By closing the lid, it's a laptop (asus zenbook)


> - Which screen locker do you use? (e.g. light-locker or
> xscreensaver?)

cinnamon-screensaver

> This looks like a race condition in which system is hibernated
> before your screen is locked. I saw this for suspend when I let
> systemd manage my power button. My solution was to
> edit/etc/systemd/logind.conf to set HandlePowerKey=ignore and to let
> Xfce handle locking and suspend and Xfce Power Manager / Security /
> "Lock screen when system is going for sleep"). I use xscreensaver.

I think you're on to something.  When I CTRL+ATL+L the system, and then
close the lid, the post-hibernation resume works correctly (no screen
leakage).  Unfortunately changing the systemd login settings didn't
seem to have any effect.  I'm comfortable not using systemd on servers,
is it just as straight forward without it on desktops/laptops?

tia,

- -Jim P.

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Re: Display image after resume

[Ben Caradoc-Davies]

On 04/06/18 10:03, Jim Popovitch wrote:

What produces the desktop image that is displayed immediately after
resuming from hibernation?
When resuming, I see the following in order:
   1. the boot screen
   2. a blank screen
   3. the actual desktop (live or a snapshot of it)
   4. the lockscreen password prompt
What I would like to do is prevent the actual desktop, or the
screenshot of it, from appearing after the system boots from
hibernation.
-Jim P.


- What is your desktop?
- Are you using systemd?
- How do you initiate hibernation? Via the desktop or via a keyboard or 
chassis button?

- Which screen locker do you use? (e.g. light-locker or xscreensaver?)

This looks like a race condition in which system is hibernated before 
your screen is locked. I saw this for suspend when I let systemd manage 
my power button. My solution was to edit/etc/systemd/logind.conf to set 
HandlePowerKey=ignore and to let Xfce handle locking and suspend and 
Xfce Power Manager / Security / "Lock screen when system is going for 
sleep"). I use xscreensaver.


Kind regards,

--
Ben Caradoc-Davies 
Director
Transient Software Limited 
New Zealand

Display image after resume

[Jim Popovitch]

What produces the desktop image that is displayed immediately after
resuming from hibernation?  

When resuming, I see the following in order:

  1. the boot screen
  2. a blank screen
  3. the actual desktop (live or a snapshot of it)
  4. the lockscreen password prompt 

What I would like to do is prevent the actual desktop, or the
screenshot of it, from appearing after the system boots from
hibernation.

-Jim P.

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