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Groups > linux.debian.user > #245617 > unrolled thread

Xfce4: screen visible upon resume before xscreensaver locks it

Started byCelejar <celejar@gmail.com>
First post2022-02-22 15:20 +0100
Last post2022-02-23 20:30 +0100
Articles 5 — 3 participants

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  Xfce4: screen visible upon resume before xscreensaver locks it Celejar <celejar@gmail.com> - 2022-02-22 15:20 +0100
    Re: Xfce4: screen visible upon resume before xscreensaver locks it John Crawley <john@bunsenlabs.org> - 2022-02-23 04:00 +0100
      Re: Xfce4: screen visible upon resume before xscreensaver locks it John Crawley <john@bunsenlabs.org> - 2022-02-23 05:40 +0100
        Re: Xfce4: screen visible upon resume before xscreensaver locks it Tim Woodall <debianuser@woodall.me.uk> - 2022-02-23 20:10 +0100
      Re: Xfce4: screen visible upon resume before xscreensaver locks it Celejar <celejar@gmail.com> - 2022-02-23 20:30 +0100

#245617 — Xfce4: screen visible upon resume before xscreensaver locks it

FromCelejar <celejar@gmail.com>
Date2022-02-22 15:20 +0100
SubjectXfce4: screen visible upon resume before xscreensaver locks it
Message-ID<DTEbf-3ACd-3@gated-at.bofh.it>
Hello,

I'm running Xfce4 on a recent install of Sid. I have configured Xfce4
to "Lock screen before sleep" (in Session and Startup / General), but
when I use xscreensaver, when resuming from suspend the screen is often
visible for a brief period before xscreensaver kicks in. I have not
seen this problem when using light-locker. I also tried briefly with
xfce4-screensaver and did not see the problem, but I have not done
extensive testing with xfce4-screensaver.

This is obviously a serious problem: I see that this has been a
commonly reported Xfce issue, with various distros / screensavers, etc.,
over the years, e.g.:

https://bugs.mageia.org/show_bug.cgi?id=28286
https://bugzilla.xfce.org/show_bug.cgi?id=14782
https://bugzilla.xfce.org/show_bug.cgi?id=15929
https://askubuntu.com/questions/1383379/xubuntu-desktop-visible-after-suspend-before-lock-screen

but I can't make out whether I have misconfigured something here, or
whether this is a serious security bug in the current Xfce4 -
xscreensaver integration.

Celejar

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#245639

FromJohn Crawley <john@bunsenlabs.org>
Date2022-02-23 04:00 +0100
Message-ID<DTQ2J-3HII-1@gated-at.bofh.it>
In reply to#245617
On 22/02/2022 23:12, Celejar wrote:
> Hello,
> 
> I'm running Xfce4 on a recent install of Sid. I have configured Xfce4
> to "Lock screen before sleep" (in Session and Startup / General), but
> when I use xscreensaver, when resuming from suspend the screen is often
> visible for a brief period before xscreensaver kicks in. I have not
> seen this problem when using light-locker. 
>...
> I can't make out whether I have misconfigured something here, or
> whether this is a serious security bug in the current Xfce4 -
> xscreensaver integration.

I can't shed any light on the cause, but can report I see the same thing on a non-xfce system. I'm using lightdm and light-locker, then openbox, although am using some xfce utilities.

Usually when booting up a flash of the previous user desktop is shown before the login window. Agreed, this is not desirable at all. The only possible culprit I can think of is xfdesktop4 - can you try booting to a session with that disabled?

-- 
John

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#245640

FromJohn Crawley <john@bunsenlabs.org>
Date2022-02-23 05:40 +0100
Message-ID<DTRBv-3IQf-3@gated-at.bofh.it>
In reply to#245639
On 23/02/2022 11:50, John Crawley wrote:
> On 22/02/2022 23:12, Celejar wrote:
>> Hello,
>>
>> I'm running Xfce4 on a recent install of Sid. I have configured Xfce4
>> to "Lock screen before sleep" (in Session and Startup / General), but
>> when I use xscreensaver, when resuming from suspend the screen is often
>> visible for a brief period before xscreensaver kicks in. I have not
>> seen this problem when using light-locker. ...
>> I can't make out whether I have misconfigured something here, or
>> whether this is a serious security bug in the current Xfce4 -
>> xscreensaver integration.
> 
> I can't shed any light on the cause, but can report I see the same thing on a non-xfce system. I'm using lightdm and light-locker, then openbox, although am using some xfce utilities.
> 
> Usually when booting up a flash of the previous user desktop is shown before the login window. Agreed, this is not desirable at all. The only possible culprit I can think of is xfdesktop4 - can you try booting to a session with that disabled?
> 
Forgot to mention - I'm not using xscreensaver.

-- 
John

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#245656

FromTim Woodall <debianuser@woodall.me.uk>
Date2022-02-23 20:10 +0100
Message-ID<DU5br-3RoO-1@gated-at.bofh.it>
In reply to#245640
On Wed, 23 Feb 2022, John Crawley wrote:

> On 23/02/2022 11:50, John Crawley wrote:
>> On 22/02/2022 23:12, Celejar wrote:
>>> Hello,
>>> 
>>> I'm running Xfce4 on a recent install of Sid. I have configured Xfce4
>>> to "Lock screen before sleep" (in Session and Startup / General), but
>>> when I use xscreensaver, when resuming from suspend the screen is often
>>> visible for a brief period before xscreensaver kicks in. I have not
>>> seen this problem when using light-locker. ...
>>> I can't make out whether I have misconfigured something here, or
>>> whether this is a serious security bug in the current Xfce4 -
>>> xscreensaver integration.
>> 
>> I can't shed any light on the cause, but can report I see the same thing on 
>> a non-xfce system. I'm using lightdm and light-locker, then openbox, 
>> although am using some xfce utilities.
>> 
>> Usually when booting up a flash of the previous user desktop is shown 
>> before the login window. Agreed, this is not desirable at all. The only 
>> possible culprit I can think of is xfdesktop4 - can you try booting to a 
>> session with that disabled?
>> 
> Forgot to mention - I'm not using xscreensaver.
>
>
I vaguely recall having a similar issue years ago. Managed to find it:

https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=520633

but now I read through I see it was nothing to do with xscreensaver.

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#245660

FromCelejar <celejar@gmail.com>
Date2022-02-23 20:30 +0100
Message-ID<DU5uN-3Rvf-3@gated-at.bofh.it>
In reply to#245639
On Wed, 23 Feb 2022 11:50:54 +0900
John Crawley <john@bunsenlabs.org> wrote:

> On 22/02/2022 23:12, Celejar wrote:
> > Hello,
> > 
> > I'm running Xfce4 on a recent install of Sid. I have configured Xfce4
> > to "Lock screen before sleep" (in Session and Startup / General), but
> > when I use xscreensaver, when resuming from suspend the screen is often
> > visible for a brief period before xscreensaver kicks in. I have not
> > seen this problem when using light-locker. 
> >...
> > I can't make out whether I have misconfigured something here, or
> > whether this is a serious security bug in the current Xfce4 -
> > xscreensaver integration.
> 
> I can't shed any light on the cause, but can report I see the same
> thing on a non-xfce system. I'm using lightdm and light-locker, then
> openbox, although am using some xfce utilities.
> 
> Usually when booting up a flash of the previous user desktop is shown
> before the login window. Agreed, this is not desirable at all. The only
> possible culprit I can think of is xfdesktop4 - can you try booting to
> a session with that disabled?

Thanks for the suggestions - if I manage to do that, I'll report back
with the results.

Celejar

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