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I had this happen recently and what I discovered is that I had previously removed some packages at the OS level. APT indicated they were no longer used, so I removed them against good judgement.

Once I re-installed them my pendant started working properly.

I stay away from USB pendants and the like.

A wireless one is no option for me.
The only way to use it now, is not to use the ON/OFF switch. But I know that I will use it instinctively.

I hope there will be a fix for this.

I had the same problem. It was working after start, when turn on again, in terminal it was cycling endless through connecting - disconnecting.
I have a wireless one, maybe 10 years old, and this worked until 2.7.14  After upgrading to 2.8  ,the wireless device showed this behaviour, but the wired device worked then.
And now, version 2.9 wants the wireless device. This was on 3 Pc, HP800 G2 and G3, always the same. As the old wireless device is working, no further action was required
 

I have a problem with my hand wheel xhc-whb04b (wired version) on my machine.
A few weeks ago I have installed LinuxCNC 2.9.3(iso) on my mill pc, but I missed to configure my hand wheel. Yesterday I wanted to do so.
So I made a new HAL-file from the 2.8 documentation , insert the lines for halui inside the ini-file, added the .rules-file and reload it with udevadm.

When I start LinuxCNC and the hand wheel is ON, it works.
When LinuxCNC is running and I switch the hand wheel ON for the first, it works too.
But If I switch it OFF and ON again, when Lcnc is running, I can see totally wrong position values and after a few seconds it switches to Lost RF. I need to restart LinuxCNC to get the hand wheel back to work.

I try this on a virtual machine with Lcnc 2.9.1, 2.9.2 and 2.9.3 with the same problem.
On my milling pc is also my old 2.8.4(deb10) installation and there is no problem with it.

When I start "/usr/bin/xhc-whb04b-6 -p" on 2.8.4 I can switch it OFF and ON and the program is still running. If I do it on 2.9.x it stops working after the first turn off.
I also copied the file from 2.8.4 to 2.9.x with the same result.

Does anyone else have this problem?