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Monitor switched off after resume from hibernation

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  Monitor switched off after resume from hibernation solitone <solitone@mail.com> - 2017-01-05 22:10 +0100
    Re: Monitor switched off after resume from hibernation Keith Bainbridge <keithrbaugroups@gmail.com> - 2017-01-06 01:20 +0100
      Re: Monitor switched off after resume from hibernation David Wright <deblis@lionunicorn.co.uk> - 2017-01-06 03:00 +0100
        Re: Monitor switched off after resume from hibernation Keith Bainbridge <keithrbaugroups@gmail.com> - 2017-01-06 06:20 +0100
          Re: Monitor switched off after resume from hibernation David Wright <deblis@lionunicorn.co.uk> - 2017-01-06 15:30 +0100
            Re: Monitor switched off after resume from hibernation Stefan Monnier <monnier@iro.umontreal.ca> - 2017-01-06 22:50 +0100
        Re: Monitor switched off after resume from hibernation solitone <solitone@mail.com> - 2017-01-06 22:10 +0100
          Re: Monitor switched off after resume from hibernation David Wright <deblis@lionunicorn.co.uk> - 2017-01-07 05:00 +0100
            Re: Monitor switched off after resume from hibernation solitone <solitone@mail.com> - 2017-01-07 08:20 +0100
              Re: Monitor switched off after resume from hibernation Joe <joe@jretrading.com> - 2017-01-07 10:10 +0100
                Re: Monitor switched off after resume from hibernation solitone <solitone@mail.com> - 2017-01-07 16:10 +0100
                Re: Monitor switched off after resume from hibernation solitone <solitone@mail.com> - 2017-01-07 19:40 +0100
              Re: Monitor switched off after resume from hibernation David Wright <deblis@lionunicorn.co.uk> - 2017-01-07 20:40 +0100
                Re: Monitor switched off after resume from hibernation solitone <solitone@mail.com> - 2017-01-07 21:30 +0100
                Re: Monitor switched off after resume from hibernation solitone <solitone@mail.com> - 2017-01-08 08:10 +0100
                  Re: Monitor switched off after resume from hibernation David Wright <deblis@lionunicorn.co.uk> - 2017-01-09 02:10 +0100
                    Re: Monitor switched off after resume from hibernation Joel Rees <joel.rees@gmail.com> - 2017-01-09 13:50 +0100
                      Re: Monitor switched off after resume from hibernation David Wright <deblis@lionunicorn.co.uk> - 2017-01-09 15:20 +0100
      Re: Monitor switched off after resume from hibernation solitone <solitone@mail.com> - 2017-01-06 07:00 +0100
        Re: Monitor switched off after resume from hibernation Keith Bainbridge <keithrbaugroups@gmail.com> - 2017-01-06 07:30 +0100
          Re: Monitor switched off after resume from hibernation solitone <solitone@mail.com> - 2017-01-06 13:20 +0100
        Re: Monitor switched off after resume from hibernation Charlie Kravetz <cjk@teamcharliesangels.com> - 2017-01-06 15:40 +0100
          Re: Monitor switched off after resume from hibernation solitone <solitone@mail.com> - 2017-01-06 20:50 +0100
            Re: Monitor switched off after resume from hibernation Charlie Kravetz <cjk@teamcharliesangels.com> - 2017-01-06 23:20 +0100
              Re: Monitor switched off after resume from hibernation solitone <solitone@mail.com> - 2017-01-07 08:00 +0100
    Re: Monitor switched off after resume from hibernation Joel Rees <joel.rees@gmail.com> - 2017-01-09 14:10 +0100
      Re: Monitor switched off after resume from hibernation solitone <solitone@mail.com> - 2017-01-09 19:00 +0100
        Re: Monitor switched off after resume from hibernation solitone <solitone@mail.com> - 2017-01-22 14:40 +0100

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#176361

On Friday, January 6, 2017 5:28:19 PM CET Keith Bainbridge wrote:
> I'm no expert, but I wonder if the book is resuming from hibernate in the
> state it was at hibernate. If so, the system thinks the screen is off.
Yes, this is exactly what seems to happen. But the funny thing is--when the 
system has resumed, there is no way to switch the screen on!

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#176366

On Fri, 06 Jan 2017 06:54:29 +0100
solitone <solitone@mail.com> wrote:

>On Friday, January 6, 2017 11:11:45 AM CET Keith Bainbridge wrote:
>> Ummm, why turn the monitor off first?  
>
>I use KDE's power management tool to e.g. dim the screen after 5 minutes, 
>switch the screen off after 10 mins, suspend to RAM after 20 mins, and 
>hibernate to disk when I close the lid.
>
>If I leave the computer inactive for more than 10 minutes and then I close the 
>lid, the system will hibernate. When I resume it, the monitor will be switched 
>off at the end of the resume process.
>
>> I use suspend rather than hibernate, on a macbook 4,1 and just close the
>> lid.   
>
>Yes, but I'd rather take advantage of all the energy saving options that are 
>available. Booting up is so quick on a MacBookPro 12,1 that you may well use 
>hibernate rather than suspend, and resume the system in few seconds.
>

If you suspend to RAM, then hibernate, what happens if you do not
suspend to RAM first? 

-- 
Charlie Kravetz
Linux Registered User Number 425914
[http://linuxcounter.net/user/425914.html]
Never let anyone steal your DREAM.   [http://keepingdreams.com]

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#176387

On Friday, January 6, 2017 5:48:18 AM CET Charlie Kravetz wrote:
> If you suspend to RAM, then hibernate, what happens if you do not
> suspend to RAM first?

On my system, if I hibernate with everything on (including the monitor) all 
works fine. 

Instead, if I hibernate with the monitor off (but the system is not 
suspended), I got the problem I described in my original post. When I wake up 
the system, I see the boot messages, everything seems fine, but at the end of 
the resume phase the monitor switches off and I have no way to turn it on, 
apart from a reboot.

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#176396

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On Fri, 06 Jan 2017 20:39:38 +0100
solitone <solitone@mail.com> wrote:

>On Friday, January 6, 2017 5:48:18 AM CET Charlie Kravetz wrote:
>> If you suspend to RAM, then hibernate, what happens if you do not
>> suspend to RAM first?  
>
>On my system, if I hibernate with everything on (including the monitor) all 
>works fine. 
>
>Instead, if I hibernate with the monitor off (but the system is not 
>suspended), I got the problem I described in my original post. When I wake up 
>the system, I see the boot messages, everything seems fine, but at the end of 
>the resume phase the monitor switches off and I have no way to turn it on, 
>apart from a reboot.
>
>

I would set it not to suspend. That causes the setting of monitor
off/on to be stored in RAM. When it then hibernates, that reminder to
turn the monitor back on is lost.

- -- 
Charlie Kravetz
Linux Registered User Number 425914
[http://linuxcounter.net/user/425914.html]
Never let anyone steal your DREAM.   [http://keepingdreams.com]
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#176400

On Friday, January 6, 2017 1:49:59 PM CET Charlie Kravetz wrote:
> I would set it not to suspend. That causes the setting of monitor
> off/on to be stored in RAM. When it then hibernates, that reminder to
> turn the monitor back on is lost.

So are you saying the behaviour I see is normal? Does it always happen? Do you 
experience this? Such behaviour doesn't seem correct to me. Why doesn't that 
reminder get saved to disk, when the system hibernate, like everything else?

The sequence turn off screen -> suspend -> hibernate would seem pretty 
standard to me. Basically you are saying that I should hibernate as the first 
power management step, which I would consider overkill, after just e.g. 5 
minutes inactivity.

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#176494

On Fri, Jan 6, 2017 at 6:04 AM, solitone <solitone@mail.com> wrote:
>
> I'm on debian stretch, and my computer is a MacBookPro 12,1. I've recently
> noticed an issue that affect my system when it hibernates.
>
> When the screen is already switched off and then the system hibernates, it
> won't resume correctly later on. Specifically, the monitor will be switched off
> again at the end of the resume process.

So, just out of curiosity, what happens if you use ctrl-alt-Fn to
switch between virtual consoles several times after the box gets stuck
thinking the screen is off?

>
> [...]

>   Davide

-- 
Joel Rees

I'm imagining I'm a novelist:
http://reiisi.blogspot.jp/p/novels-i-am-writing.html

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#176507

On Monday, January 9, 2017 9:59:45 PM CET Joel Rees wrote: 
> So, just out of curiosity, what happens if you use ctrl-alt-Fn to
> switch between virtual consoles several times after the box gets stuck
> thinking the screen is off?

I don't have virtual consoles. During installation I could switch between 
different consoles with CTRL-ALT-Fn, but since installation has completed this 
key sequence doesn't produce any result. I haven't bothered to investigate 
this thing yet.

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#176899

On Monday, January 9, 2017 6:53:36 PM CET solitone wrote:
> On Monday, January 9, 2017 9:59:45 PM CET Joel Rees wrote:
> > So, just out of curiosity, what happens if you use ctrl-alt-Fn to
> > switch between virtual consoles several times after the box gets stuck
> > thinking the screen is off?
> 
> I don't have virtual consoles. During installation I could switch between
> different consoles with CTRL-ALT-Fn, but since installation has completed
> this key sequence doesn't produce any result.

Well, that's not true. In fact I do have virtual consoles. On the Mac I need 
to press ctrl+alt+fn+Fi, where i=1, 2, 3... 6 to get to one of the six 
vconsoles I have. fn is the key that makes the top row keys act as function 
keys:
http://cdn.osxdaily.com/wp-content/uploads/2016/03/macbook-keyboard.jpg

As for Joel's question, trying to switch between virtual consoles several 
times doesn't result in anything--the screen keeps staying black. And it's not 
the system that *thinks* the screen is off. It is indeed off, as the following 
command from an ssh session shows:

$ cat /sys/class/backlight/intel_backlight/bl_power 
4

bl_power = 4 means the screen is off.

I sent a bug report on this issue some weeks ago, but it's not been considered 
till now, so I wonder whether I sent it to the right place and whether it will 
ever be considered:
https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=850221

Cheers,
  Davide

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