7i76D TB3 power?

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09 Sep 2021 15:37 - 09 Sep 2021 15:37 #220067 by Muzzer
7i76D TB3 power? was created by Muzzer
I have a dedicated 5V supply for my 7i76D and 7i85 now, to decouple the load from the motherboard. LinuxCNC comes up OK with the W2 jumper removed (but the Field IO doesn't work obvs) but when I jumper the RH pins, the PC shuts down. I would have expected this behaviour if I'd jumpered the LH pins by mistake.

I suspect the corresponding 5i25 jumper is still set to supply power through the ribbon cable but thought the 7i76D jumper would have taken care of it - didn't think it would matter if the 5V made its way onto the ribbon cable as long as it didn't go any further.

Do I need to open up the PC again and change the jumper(s) over on the 5i25? It's a bit of a fiddle to do this, which is why I ask. Same setup for the 7i85 as for the 7i76D ie swap the 5i25 jumper for that too?

Thanks
Last edit: 09 Sep 2021 15:37 by Muzzer.

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09 Sep 2021 15:55 #220069 by PCW
Replied by PCW on topic 7i76D TB3 power?
Yes, you need to set the 5I25 jumper also (or you will cause a 5V short)
The following user(s) said Thank You: Muzzer

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10 Sep 2021 10:16 #220116 by Muzzer
Replied by Muzzer on topic 7i76D TB3 power?
Well I've fixed that by ensuring both 5i25 jumpers are correct and it starts up OK again. But when I try to run LinuxCNC, I get errors. Have I dislodged the 5i25 in the process perhaps? Looked OK when I refitted the case.

Seems to be having a problem loading hm2_pci for some reason. Is there a simple and obvious explanation / solution? Here's the error report:

 

File Attachment:

File Name: linuxcnc.txt
File Size:5 KB
Attachments:

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10 Sep 2021 13:30 #220129 by PCW
Replied by PCW on topic 7i76D TB3 power?
Not sure but this is an issue:

"Note: Using POSIX non-realtime"

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10 Sep 2021 13:42 #220130 by Muzzer
Replied by Muzzer on topic 7i76D TB3 power?
Ooof. That looks like scary deep water.

This thread seems to discuss a similar issue although I barely understand what is being discussed  forum.linuxcnc.org/38-general-linuxcnc-q...non-realtime?start=0  Do I need to try to understand what chmod does?

The Axis sim still works OK and I also had Gmoccapy running yesterday, notwithstanding the lack of limit switch inputs due to the jumpers not being fitted then.

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10 Sep 2021 13:49 - 10 Sep 2021 13:49 #220131 by PCW
Replied by PCW on topic 7i76D TB3 power?
What the message means is that you are not running a real time kernel

What does

uname -a

report?
Last edit: 10 Sep 2021 13:49 by PCW.

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10 Sep 2021 19:48 #220168 by Muzzer
Replied by Muzzer on topic 7i76D TB3 power?
I'm seeing this:
muzzer_linux@LinuxCNC:~$ uname -a
Linux LinuxCNC 5.4.0-81-generic #91-Ubuntu SMP Thu Jul 15 19:09:17 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux

Does this help to explain what's happening?
Many thanks

 

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10 Sep 2021 19:54 #220169 by PCW
Replied by PCW on topic 7i76D TB3 power?
Probably.

That's a standard kernel and LinuxCNC needs a real time kernel

How did you install linuxCNC?

Is it possible that you were running a real time kernel;
and somehow if got replaced? (this can happen with a system upgrade)

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10 Sep 2021 20:03 #220171 by Muzzer
Replied by Muzzer on topic 7i76D TB3 power?
I installed Mint 20, then LinuxCNC 2.8.2, as described by Tommylight. Yesterday I was crowing about how well it went but perhaps that was premature and naive!!  forum.linuxcnc.org/9-installing-linuxcnc...tall?start=90#219941

I didn't notice any warnings or errors and it ran Gmoccapy OK as far as I could tell (although it complained about the limit switches due to the open jumpers). However, today when I powered it up after refitting the 5i25 jumpers, I have this going on. 

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10 Sep 2021 21:02 #220172 by PCW
Replied by PCW on topic 7i76D TB3 power?
The kernel issue is unrelated to any hardware issues,
except if an update was done, then the new kernel would
not be used until you rebooted.

If you did successfully install a real time kernel, you may need
to tell the bootloader (grub) to load it at startup instead of the
generic kernel. You can check by interrupting the boot process
and hand selecting the kernel in the advanced boot menu

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