Can you used an F key that switches from one monitor to overcome the difficulty?
What kind of cable / "monitor" do you have? I have a monitor that can serve as
a TV. It even has a remote control. I had to get a DVI cable to make my monitor
work correctly, from Amazon:
http://tinyurl.com/hdn7ss9
Some times things are just weird!
On May 8, 2016 3:57:47 PM EDT, Dan Hitt <[email protected]> wrote:
>Ah Victor thanks a million!
>
>Turning off the monitor turns out to be key.
>
>If i turn off the HDMI monitor, lightdm (or whatever the underlying
>service is) seems to take that as a signal to never return.
>
>So that means that there is a work around. First, do ctrl-alt-f1 to
>get into a virtual monitor. Then turn off the monitor.
>
>And coming back, just do the reverse: turn on the monitor, then do
>ctrl-alt-f7 to get back xwindows.
>
>This is possibly related to another problem that i have, where i
>cannot listen to headphones plugged into my hdmi monitor. (Under
>ubuntu 15.10 i could do this, so i know it is not a hardware problem.)
>
>Now, unfortunately, i'm far too ignorant to have any ideas about your
>question "with modern lcd monitors is there any difference between
>sleep and a software shut off?"
>
>But i think it would be useful to know in order to construct some sort
>of model of how hdmi works (what states can a monitor be in, and what
>transitions are possible under what conditions between the states).
>
>Anyhow, thanks again for your help! (And thanks everybody else also.
>I've learned something from every suggestion.)
>
>dan
>
>
>On Sun, May 8, 2016 at 11:32 AM, Victor Forberger
><[email protected]> wrote:
>> On 05/08/2016 11:52 AM, Dan Hitt wrote:
>>> On Sun, May 8, 2016 at 5:07 AM, Petter Adsen <[email protected]>
>wrote:
>>>> On Sat, 7 May 2016 20:32:03 -0700
>>>> Dan Hitt <[email protected]> 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
>> [email protected]
>> blog: http://linuxatty.wordpress.com
>>
>>
>>
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