Keyboard Jogging Problems!!!.

I am currently seeing a very serious problem with keyboard jogging on a fresh install of the current version of Linuxcnc 2.9, installed using the current ISO.  Occasionally when jogging using the keyboard it appears as if the jog key you press sticks and the machine will continue to jog long after you release the key.  Sometimes it won't stop jogging until you press a different keyboard key (what key doesn't matter.)  I have only observed this behavior when using keyboard jogging.  Jogging using the mouse to click on screen jog buttons behaves normally.  This is a very serious and unsafe problem.  I just updated the control on this machine from Linuxcnc 2.7 to the current version, and I had never observed this kind of behavior before.  I've already totally smashed one limit switch jogging before homed, so no soft limits.)

The machine is using the Axis UI, running on an industrial (fanless) i5 mini computer.  Latency seems OK and the UI is very responsive not laggy at all.  

Is this some kind of bug?  Could it be a Debian setting? 

Todd Zuercher wrote:

.... so no soft limits

Does this also happen when homed? Meaning, does it ignore soft limits?
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The only thing similar i recall was/is when a jog key is held pressed then another jog key is pressed => releasing them both would result in machine continuing to move until another jog button is pressed. This was probably a few (maybe two) years back, and only happened on 1 PC. I was busy so i did not have time to do more testing.
Does the same thing happen, or does it happen with a single key?
To stop, does any other key work, or just the jog keys?
Did you test with another keyboard?
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Old info, well very old, the PC's had in BIOS a setting for "typematic rate settings" where you could set how much a should a key be pressed till it starts repeating, then how fast should those repetitions be, and for how long those should persist.
Have not seen that in PC's for over 20 years probably.

Is it a wireless keyboard? I've had those start that when the battery died.

I suspect its a hardware fault. Its a long time since I've used 2.9 on a live machine but it never happened to me.
Can you swap out the keyboard for another one? Some compressed air to blow out the keys perhaps?

This sounds like an autorepeat issue I've experienced in the past.

To test if it is, open a terminal window, and enter the following command:



Launch LinuxCNC and jog around. If the problem goes away, that's the issue and we can come up with a more permanent solution.

To turn autorepeat back on:

To answer a few questions,

Tommy,
The soft limits work fine after the machine is homed. The crash into the hard limit happened before homing the machine while jogging from a long distance to get close to the home switch before homing.

This is a new pc bought just a few months ago for this refit.

NWE and Rod
It is an ordinary USB wired keyboard, and exhibits no signs of physical sticking keys, (other than this issue while jogging).

I'll try the xset -r, and report back. But the problem is intermittent, and may not act up for testing.