On 8/26/24 14:37, David Wright wrote:
On Mon 26 Aug 2024 at 10:29:10 (-0400), gene heskett wrote:
xfce4 desktop, running linuxcnc, [ … ]
came across a dangerous situation yesterday.
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.
Surely it's not screen /blanking/ that's your problem¹ but screen
/locking/. BTW were you really logging back in, or just unlocking
the session?
total login to get back to my session.
That monitor AND the idling rpi4b draw about 22 watts, and is turned
off only for maintenance. UPS, standby generator, uptimes might be
years.
Replacing a CRT power hungry monitor means the only reason to blank a
screen
tomas mentioned xset, which should deal with that. You need to decide
on whether a couple of seconds is too long to wait for recovery from
anything more than simple blanking.
If the machine starts, while trying to wake it up and log back in to get
control back to me, its already 5 seconds too damned late. With the pi,
wakeup time is 5 + seconds by which time a sleeve caught on a chuck jaw
has already tried to rip an arm off.
and interpose a login is security against prying eyes in an
office environment.
That's the troublesome one for you.
Absolutely. This is not an office environment. The path thru this garage
is hardly wide enough for me, let alone company.
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.
AFAICT you need to investigate XFCE's Power Manager. A quick google
turned up these:
https://forum.manjaro.org/t/how-to-disable-auto-black-screen/127827/2
https://forum.xfce.org/viewtopic.php?id=13535
https://forum.manjaro.org/t/lock-screen-vs-login-screen/166644
but there may be better ones too.
¹ touch Ctrl, the key at the extreme bottom left of the keyboard,
to defeat it.
Cheers,
David.
Thank you David.
.
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
