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
(amaca...@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
