On 10/30/2016 03:48 PM, yaqu wrote:
> On Sun, 30 Oct 2016 03:28:39 -0700 (PDT), "Mike A."
> wrote:
>
>> But if I open the application menu band then close the lid, the
>> screensaver does not kick in. When I open the lid later, I can
>> start using the machine just where I left it.
>>
>> I am running Qubes 3.2 with Xfce.
>>
>> Can anyone else recreate this, or is it just a problem locally
>> here (user error at my end)?
>
> I have tested it on Lenovo T520 (R3.2, Xfce) and got the same
> behaviour - closing lid has no effect while appmenu is opened. I have
> tested it with various settings in Xfce Power Manager (lock screen,
> suspend, switch off display). When appmenu is closed, closing lid
> works as expected.
>
> Additionally, locking screen manually (Ctrl-Alt-L) doesn't work too
> while appmenu is opened.
>
It's a known problem of X (as an architecture); it prevents any
succesful implementation of the concept of lock screens. It does not
only affect Xfce, but all other desktop environments - actually, it
affects all X11 implementations on any platform because screen locking
is a scenario not provided by the architecture. You may check on
https://blog.martin-graesslin.com/blog/2015/01/why-screen-lockers-on-x11-cannot-be-secure/
for an extended explanation of the concept, from the perspective of KDE
developers. One common symptom is the one you described; i.e. opening
any menu prevents screen-savers or screen-lockers from running.
Our only reasonable hope in the relatively-near future is Wayland, whose
architecture does provide for a screen-locking scenario; the adoption in
Qubes may not be straightforward because of the way windows are cloned
from the VMs into dom0. In short, qubes-guid needs to be able to
screengrab every window, which is something Wayland tries to prevent for
privacy and security concerns.
--
Alex
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