[xubuntu-users] restarting window server or possibly usb service remotely

[Victor Forberger]

On 05/08/2016 11:52 AM, Dan Hitt wrote:
> On Sun, May 8, 2016 at 5:07 AM, Petter Adsen <petter at synth.no> wrote:
>> On Sat, 7 May 2016 20:32:03 -0700
>> Dan Hitt <dan.hitt at gmail.com> wrote:
> .....
>>> Occasionally after i lock the screen and come back after a few hours i
>>> cannot get it to respond.
>>>
>>> The machine is alive, and i can ssh into from another host.
>>>
>>> But wiggling the mouse and pressing keys leaves the monitor pitch
>>> black.
> .....
>>
>> If you don't mind restarting your entire X session, you can try 'sudo
>> systemctl restart lightdm.service'. You could also try to kill the
>> screen locker process, I think Xfce uses light locker by default.
>>
> 
> Thanks Petter!
> 
> So the problem came up again after i last wrote (i had to go do some
> chores, and when i came back keyboarding and mousing did not bring
> back the display).
> 
> So i tried your suggestion of restarting lightdm.
> 
> And it worked, so thanks!
> 
> I did lose my X state, but i don't think any other state.
> 
> This seems to indicate that lightdm is going into too deep a sleep, or
> perhaps taking something to sleep with it that should stay awake.
> 
> If anybody has any advice about how to approach this kind of lightdm
> problem, i'm all ears --- although i know next-to-nothing about
> lightdm.
> 
> Thanks again everybody for all the suggestions.  They were all helpful.
> 
> dan
> 
I had a similar problem a ways back. I'm sorry if I can't pull up
specific info from my past problem-solving (I searched through various
logs in /var/log for log entries that identified what the problem was).

But, I do recall the problem was actually related to the monitor being
shut off (as opposed to just dimmed). When unlocking the computer for
use after a long delay, the process for turning the monitor back on was
not working. I fixed the problem by changing power manager settings so
that the display was never turned off, only put to sleep. Once that
setting was changed, lightlocker could activate the monitor again once
the session was unlocked.

Restarting lightdm certainly will also do the trick. But, it is a
radical solution, especially if the problem is just related to getting
the monitor to connect to the xfce window manager (note that xfce runs
on top of lightdm -- i.e., lightdm provides the login screen when the
computer is turned on; xfce is the actual desktop environment for
getting work done after a successful login).

And, one question here: with modern lcd monitors is there any difference
between sleep and a software shut off?

- Victor

--
Victor Forberger
vforberger at fastmail.fm
blog: http://linuxatty.wordpress.com


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