Homing fails 2.9.0 pre0-5518

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18 Jan 2022 23:04 #232353 by andypugh
Are you building from source or using buildbot debs?

This would be a good point to run git-bisect, if things definitely worked better with a previous version of 2.9.
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19 Jan 2022 06:44 #232404 by jsskangas
I use builbot deb.
I was already planning to force older versions to see which version works.

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19 Jan 2022 08:46 #232415 by Aciera
Replied by Aciera on topic Homing fails 2.9.0 pre0-5518

joints are setup correctly and if you jog them they work as they should. Can see it in youtube video.

I'm not saying that your joints are set up wrong. Sometimes it just helps to find where the problem may be by adjusting the settings.
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19 Jan 2022 12:48 #232431 by jsskangas
Aciera: good point, I did paranoid check.... just to be sure

Found out that FF1 does not make any affect anymore,
when this change has happened?

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19 Jan 2022 16:06 #232444 by dgarrett
The complete history for the pid component is here:

master: github.com/LinuxCNC/linuxcnc/commits/mas...hal/components/pid.c
2.8: github.com/LinuxCNC/linuxcnc/commits/2.8...hal/components/pid.c

don't see any recent changes that would affect FF1 usage.

The only commmit that is in master and not in current 2.8 is:
bab0790f26 2021-11-11 07:41:40 -0500 Fix typos in src/hal0

Posting a tar or zip file of the files in your configuration might
allow someone to spot what is different

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19 Jan 2022 16:13 #232445 by jsskangas
I found this
forum.linuxcnc.org/10-advanced-configura...2-9-pid-seems-broken

I think i have exact same problem.

I noticed that I have too much following error in my joints.
So I verified that FF1 does not make any change in my setup.

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19 Jan 2022 16:49 #232448 by jsskangas
Aciera: Thanks for for idea for the paranoid check.

Problem solved.
"2.8+ and 2.9 have a bug fix in the PID component."

commenting out my "net n-vel-cmd => pid.n.command-deriv" got PID loops working again.

PID and error limits where so in my setup that jogging joint stayed under error limit, but immediately when homing started tighter folowwing error is used and joint gives following error.

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