On Tue, Aug 27, 2024 at 02:44:52PM -0400, gene heskett wrote: > On 8/26/24 14:25, Andrew M.A. Cater wrote: > > On Mon, Aug 26, 2024 at 10:29:10AM -0400, gene heskett wrote: > > > > Gene, > > > > First things first: where did the image come from? > > 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. >
That still doesn't say where the original software came from - whether yours is based on Raspberry Pi OS or on straightforward Debian. That can make a difference. > 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. > Now that there is a Debian maintainer maintaining linuxcnc in stable - _maybe_ just use that and save patching? > > > > rt-preempt kernel - so home built? > By Rod. > > linuxcnc - your install or the Debian-provided package? See above. The more you patch / move away from Debian, the less anyone here is able to help directly. > 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. > > > > > 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 > . Because the requirements of a desktop / GUI may *not* be compatible with instant response and RT kernel. Two different functions, use cases, biases in how they run. And the Pi4b, even though it is fairly capable, is not scaled for ultimate performance. You are complaining about a desktop feature here. > > > > 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. So _you_ didn't install it, it was already installed? > > > > > 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" Did you try this? You never quite seem to know what software you are running, whether you're running on X or on Wayland. That's one of the reasons we ask questions to _try_ and establish what's going on. Andy > > > 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 >
