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Re: need help killing screen blanker

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On 8/26/24 14:25, Andrew M.A. Cater wrote:
> On Mon, Aug 26, 2024 at 10:29:10AM -0400, gene heskett wrote:
>> rpib runniing bookworm. Private net. rt-preempt kernel. Security is a closed
>> garage door and lead projectiles for unwanted guests.
>>
> 
> Gene,
> 
> First things first: where did the image come from?
> Is it originally from Raspberry Pi OS?
> If not, is it from raspi.debian.net and originally built from *Debian* sources?
> 32 or 64 bit? Exact version string from uname -a please
> 
64 bit arm64 debian bookworm, modified with a later rt kernal to run 
linuxcnc, built for me by an aussie named Rod Webster,, RT kernels are 
not a problem. This one has more latency that one I built about a decade 
back but good enough to run lcnc in real time with no stuttering. 
200microsecs, mine is much faster at 12. Its a 4.19 I actually built on 
the pi, armhf flavor.

In case its not obvious, linuxcnc generally runs in its own little 
world. Your code base moves several times faster than ours. I built this 
machine a decade ago just to see if a pi3b could do it. It could but 
stumbled a bit, with a pi4b, its kool at twice the speed.  Stepper 
driven, its also a showcase for the newest motor tech, stepper/servo's. 
Several more times more accurate than normal steppers. And the motors 
run much cooler.  You see that in your power bill.

>> xfce4 desktop, running linuxcnc, which controls all 255 volt power to an
>> 11x56" lathe with several horsepower at its disposal. New install, came
>> across a dangerous situation yesterday.
>>
> 
> rt-preempt kernel - so home built?
By Rod.
> linuxcnc - your install or the Debian-provided package?
debian's lcnc-2.9 with some later patches. I'm used to running 
3.0/master on this machine as I've played the canary in the coal mine 
for that last 2 decades. Finding problems hopefully before they bite a 
shop producing a profit. But my next bday will be my 90th so I'm scaling 
back.  We are 100% volunteer, doing this either because we are retired 
and have the time(me & several others), or are involved because of the 
$dayjob.

>> Basically using the lathe as a jig to hold a long piece I was tapping by
>> hand, powered up but stopped. screen blanker came on and locked me out till
>> I logged back in leaving linuxcnc live but hidden behind a black screen.
>> This is a dangerous condition if he wrong key is hit to wake it up.
>>
> 
> You have a real time kernel to reduce latency but also put a desktop on there?
> You have two incompatible use cases and there has to be some compromise.
Sure, if the puter has the hp, why not
.
I have 4 cnc machines, and soon 3 3d-printers. With bananapi's running 
the printers by way of klipper and friends, why not, the horsepower is 
there, use it.

>> That monitor AND the idling rpi4b draw about 22 watts, and is turned off
>> only for maintenance.  UPS, standby generator, uptimes might be years.
>>
> 
> How - and from where did you install XFCE?
I used the package manager, usually synaptic, I assume Rod used a 
similar procedure. It worked, I didn't ask.
> 
>> Replacing a CRT power hungry monitor means the only reason to blank a screen
>> and interpose a login is security against prying eyes in an office
>> environment.
>>
> 
> XFCE settings should do it - _your_ requirement for screen blanking is not
> everyone's requirement for screen blanking / security. People's needs vary
> - most of the desktop environments incorporate some element of screen blanking
> for security (or power saving).
> 
>> Soooo, what do I remove to absolutely, permanently disable the screen
>> blanker? And I mean no chance it can ever do that to me again.
>>
> 
> "How to disable screen blanking in XFCE" into a search engine yields
> https://forum.xfce.org/viewtopic.php?id=8303
> 
> Last comment is
> 
> "Go to application menu, then hover over settings. One of the options should Power Manager. In there click on display. Turn off Display Power Management.
> 
> Do Not Go Through All Settings"
>> Thanks.
>>
>> Cheers, Gene Heskett, CET.
> 
> Hope this helps - all best, as ever,

Thanks Andy.

> Andy Cater
> (amacater@debian.org)
>> -- 
>> "There are four boxes to be used in defense of liberty:
>>   soap, ballot, jury, and ammo. Please use in that order."
>> -Ed Howdershelt (Author, 1940)
>> If we desire respect for the law, we must first make the law respectable.
>>   - Louis D. Brandeis
>>
> 
> .

Cheers, Gene Heskett, CET.
-- 
"There are four boxes to be used in defense of liberty:
  soap, ballot, jury, and ammo. Please use in that order."
-Ed Howdershelt (Author, 1940)
If we desire respect for the law, we must first make the law respectable.
  - Louis D. Brandeis

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Thread

need help killing screen blanker gene heskett <gheskett@shentel.net> - 2024-08-26 16:30 +0200
  Re: need help killing screen blanker <tomas@tuxteam.de> - 2024-08-26 18:50 +0200
    Re: need help killing screen blanker gene heskett <gheskett@shentel.net> - 2024-08-27 16:20 +0200
      Re: need help killing screen blanker <tomas@tuxteam.de> - 2024-08-27 16:40 +0200
      Re: need help killing screen blanker Felix Miata <mrmazda@stanis.net> - 2024-08-27 20:00 +0200
        Re: need help killing screen blanker <tomas@tuxteam.de> - 2024-08-27 20:20 +0200
    Re: need help killing screen blanker gene heskett <gheskett@shentel.net> - 2024-08-27 19:00 +0200
  Re: need help killing screen blanker Stefan Monnier <monnier@iro.umontreal.ca> - 2024-08-26 19:20 +0200
  Re: need help killing screen blanker Trish Fraser <trish@thefrasers.org> - 2024-08-26 19:30 +0200
    Re: need help killing screen blanker gene heskett <gheskett@shentel.net> - 2024-08-27 19:10 +0200
      Re: need help killing screen blanker Trish Fraser <trish@thefrasers.org> - 2024-08-28 03:40 +0200
  Re: need help killing screen blanker fxkl47BF@protonmail.com - 2024-08-26 20:10 +0200
    Re: need help killing screen blanker gene heskett <gheskett@shentel.net> - 2024-08-27 19:40 +0200
  Re: need help killing screen blanker "Andrew M.A. Cater" <amacater@einval.com> - 2024-08-26 20:30 +0200
    Re: need help killing screen blanker Stefan Monnier <monnier@iro.umontreal.ca> - 2024-08-26 21:50 +0200
    Re: need help killing screen blanker gene heskett <gheskett@shentel.net> - 2024-08-27 20:50 +0200
      Re: need help killing screen blanker "Andrew M.A. Cater" <amacater@einval.com> - 2024-08-27 21:30 +0200
  Re: need help killing screen blanker David Wright <deblis@lionunicorn.co.uk> - 2024-08-26 20:40 +0200
    Re: need help killing screen blanker Felix Miata <mrmazda@stanis.net> - 2024-08-26 21:50 +0200
    Re: need help killing screen blanker gene heskett <gheskett@shentel.net> - 2024-08-27 21:00 +0200
      Re: need help killing screen blanker David Wright <deblis@lionunicorn.co.uk> - 2024-08-28 03:10 +0200
        Re: need help killing screen blanker David Wright <deblis@lionunicorn.co.uk> - 2024-08-31 06:40 +0200
      Re: need help killing screen blanker Max Nikulin <manikulin@gmail.com> - 2024-09-02 05:20 +0200
  Re: need help killing screen blanker "Thomas Schmitt" <scdbackup@gmx.net> - 2024-08-26 20:50 +0200
    Re: need help killing screen blanker Max Nikulin <manikulin@gmail.com> - 2024-08-27 04:00 +0200

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