[arm-allstar] Pi Terminal Sleep

Fri May 25 11:31:02 EST 2018

Yes, the console blanking merely clears the screen.  It does not turn off the backlight.  Power management to power down the monitor, as far as I know, is a function of the X server, which is not installed in HamVOIP Allstar (and there is no need to install it either).  Console blanking *may* prevent burn-in of the screen.  It  just leaves the idle screen blank.  That function has been around since the earliest days of Linux, so it’s a take-it-or-leave-it by your preference.  I run all my nodes headless so it’s a moot point for me, but others may want to know how to do this.  It’s a zero resource change to the config.  This is for folks who leave monitors attached.

73,

Charles - NK8O

> On May 25, 2018, at 11:16 AM, Doug Crompton via arm-allstar <arm-allstar at hamvoip.org> wrote:
> 
> There have been some issues with display power management on the Pi.
> Probably all this does is blank the screen. If the monitor itself sees this
> as a power saving mode I don't know. Modern flat screen monitors do not
> need to be blanked for screen saving reasons only for power saving. It is
> unclear on the Pi if this shuts off back lighting or just filters all
> light. If it just makes the screen black but does not turn off back
> lighting then it is of little value unless having characters on the screen
> bothers you.
> 
> It is also really a waste of a good monitor to use HDMI on the Pi. Any
> computer you have there or elsewhere can ssh to your pi and you would get
> the same results and save a monitor and keyboard. I have many Allstar Pi's
> and I can't even remember connecting an HDMI monitor except in a portable
> arrangement. This is also essential if you have many servers. You would not
> have a monitor connected to each but rather ssh sessions opened to each on
> a single computer - Windows, Linux, Mac or whatever.
> 
> 
> *73 Doug*
> 
> *WA3DSP*
> 
> *http://www.crompton.com/hamradio <http://www.crompton.com/hamradio> <http://www.crompton.com/hamradio <http://www.crompton.com/hamradio>>*
> 
> 
> 
> 
> 
> On Fri, May 25, 2018 at 11:55 AM, "Charles Powell via arm-allstar" <
> arm-allstar at hamvoip.org <mailto:arm-allstar at hamvoip.org>> wrote:
> 
>> The parameter you are looking to find is called console blanking.
>> 
>> You can check console blanking with the command 'cat
>> /sys/module/kernel/parameters/consoleblank’  to tell you whether blanking
>> is on or off. It will return ‘0’ if off.  To enable in /boot/cmdline, the
>> command is ‘consoleblank=xxx’ where xxx is the number of seconds delay
>> before the screen goes off.   This is a kernel parameter.  /boot/cmdline
>> must remain a single line.  ‘consoleblank=600’ would give a timeout for the
>> display of 10 minutes.
>> 
>> 73,
>> 
>> Charles - NK8O
>> 
>> 
>>> On May 25, 2018, at 6:15 AM, James Hause via arm-allstar <
>> arm-allstar at hamvoip.org <mailto:arm-allstar at hamvoip.org> <mailto:arm-allstar at hamvoip.org <mailto:arm-allstar at hamvoip.org>>> wrote:
>>> 
>>> Thanks for the quick reply.  I did the change, but monitor still does not
>>> blank.
>>> Here is what the config.txt has after I updated.
>>> 
>>> # See /boot/overlays/README for all available options
>>> 
>>> gpu_mem=64
>>> initramfs initramfs-linux.img followkernel
>>> hdmi_blanking=1
>>> 
>>> 
>>> On Fri, May 25, 2018 at 1:06 AM, "Doug Crompton via arm-allstar" <
>>> arm-allstar at hamvoip.org <mailto:arm-allstar at hamvoip.org> <mailto:arm-allstar at hamvoip.org <mailto:arm-allstar at hamvoip.org>>> wrote:
>>> 
>>>> Jim,
>>>> 
>>>> Now sure why anything would have changed.
>>>> 
>>>> Try adding -
>>>> 
>>>> hdmi_blanking=1
>>>> 
>>>> to /boot/config.txt should fix the issue. Don't change anything else in
>>>> that file.
>>>> 
>>>> Let us know if that works.
>>>> 
>>>> 
>>>> *73 Doug*
>>>> 
>>>> *WA3DSP*
>>>> 
>>>> *http://www.crompton.com/hamradio <http://www.crompton.com/hamradio> <http://www.crompton.com/hamradio <http://www.crompton.com/hamradio>> <
>> http://www.crompton.com/hamradio <http://www.crompton.com/hamradio> <http://www.crompton.com/hamradio <http://www.crompton.com/hamradio>>>*
>>>> 
>>>> 
>>>> 
>>>> 
>>>> 
>>>> On Thu, May 24, 2018 at 6:30 PM, "James Hause via arm-allstar" <
>>>> arm-allstar at hamvoip.org <mailto:arm-allstar at hamvoip.org> <mailto:arm-allstar at hamvoip.org <mailto:arm-allstar at hamvoip.org>>> wrote:
>>>> 
>>>>> Not that this is a big deal, but I have noticed one thing since I did
>> the
>>>>> last update today.
>>>>> On my hardware configuration, I have a 19 inch monitor attached to the
>>>> Pi.
>>>>> When I boot up my node, I would login, and get to the Admin screen.
>>>> After
>>>>> a few minutes of inactivity, the screen would go blank, and I would
>> just
>>>>> press a key, and the screen would come back.
>>>>> After I did the update today, and I login in,  I get the admin screen,
>>>> and
>>>>> all is good, except now the screen does not go blank after minutes of
>>>>> inactivity.  Not that this is a big deal, but don't want to burn an
>> image
>>>>> on my display, so my question is do I need to change a setting
>> somewhere
>>>>> now ?
>>>>> _______________________________________________
>>>>> 
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>> http://lists.hamvoip.org/cgi-bin/mailman/listinfo/arm-allstar <http://lists.hamvoip.org/cgi-bin/mailman/listinfo/arm-allstar>>
>>>>> 
>>>>> Visit the BBB and RPi2/3 web page - http://hamvoip.org <http://hamvoip.org/> <
>> http://hamvoip.org/ <http://hamvoip.org/>>
>>>>> 
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>>>> 
>>>> Visit the BBB and RPi2/3 web page - http://hamvoip.org <http://hamvoip.org/> <
>> http://hamvoip.org/ <http://hamvoip.org/>>
>>>> 
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>>> 
>>> Visit the BBB and RPi2/3 web page - http://hamvoip.org <http://hamvoip.org/> <
>> http://hamvoip.org/>
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>> 
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