Keyboard gets unresponsive from time to time

Hello,
i just set upo mey new pc with linuxcnc. Everything seems to work correctlly, except the keyboard. From time to time suddenly the keybiadr does not longer work. I can still use the mouse to navigate, this problem ist not only under linuxcnc itself, it affects also all other applications under linux. When i reboot everything is fine again for a while. I already tested multiple keyboards and usb ports.
i could not reproduce the problem, it coms when it has the desire for it.

to be sure its not because of the power supplies for the stepper drivers, i switched them comletely off

perhaps its a problem with the rt kernel, but i could not found something about that there are only people who have problem with the keyboard under linuxcnc but the other applications are noit effected

my configuration: microatx board with intel i5, 16GB ram, onboard graphics pcix parallel portcard und parallel bob with 4 attached axis - latest linuxcnc iso image is used

Georg

This could be caused by faulty hardware somewhere causing spurious interrupts that consume CPU time.
I am not sure how to troubleshoot that except changing the PC.
You have a lot more ram than needed. 4 GB is fine. Perhaps try removing some in case it is at fault.

Hello,
parallel to the linuxcnc i use also windows on the same machine in conjunction with Estlcam and the Estlcam Board (i have still many Estlcam projects i use), here i do not see any problem with the Keyboard

ssh into the debian pc when the keyboard disconnects and run dmesg, this should give an idea of what is happening.

Hello,
at the end of the dmesg output i get this in red:
[ 131.300428] DMAR: DRHD: handling fault status reg 2
[ 131.300430] DMAR: [DMA Read NO_PASID] Request device [04:00.0] fault addr 0xfff9f000 [fault reason 0x06] PTE Read access is not set

i could not find something helpful here only things about the GPU (i have a standard intel board no nvidia card on it)

Georg

You may find it useful to pipe the output thru grep to filter any messages containing USB