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 > 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? linuxcnc - your install or the Debian-provided package? > 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. > 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? > 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, 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 >
