Linuxcnc start disables Parallel port of PCI Express card
09 Sep 2024 02:42 #309704
by mBender
Linuxcnc start disables Parallel port of PCI Express card was created by mBender
Hi Forum,
I am chasing a weird issue. I recently got a new old PC with great latency for software stepping. I have a running set up with 2 parallel port cards one of them a pci express card.
I installed a clean version of LinuxCNC, copied the config files and added the new address of the parallel port card. The card is recognized from linux as active.
As soon as I start LinuxCNC the card is switched to disabled. I tried to change the /sys/bus/..../enable file. The file still has a 1 even if the port shows with lspci -vv disabled. I can't change the file at all, even as root I am not able to change the file it says file is locked. chmod 777 on this file did not help either.
I don't know why that happens. Due to a dual boot set up I have on this PC I had to install linuxcnc a few times until I had the move cleaned. Meanwhile I had it working when I used UEFI instead of leagcy bios. But with UEFI Linux sometimes the pci express card wasn't seen at all and only showed up when I unpluged the power cord of the PC.
This is so frustrating.
If I just simply clone the old linuxcnc 2.9.3 with a 4.xx Kernel all works. But the fresh installed linuxcnc does not work.
I am chasing a weird issue. I recently got a new old PC with great latency for software stepping. I have a running set up with 2 parallel port cards one of them a pci express card.
I installed a clean version of LinuxCNC, copied the config files and added the new address of the parallel port card. The card is recognized from linux as active.
As soon as I start LinuxCNC the card is switched to disabled. I tried to change the /sys/bus/..../enable file. The file still has a 1 even if the port shows with lspci -vv disabled. I can't change the file at all, even as root I am not able to change the file it says file is locked. chmod 777 on this file did not help either.
I don't know why that happens. Due to a dual boot set up I have on this PC I had to install linuxcnc a few times until I had the move cleaned. Meanwhile I had it working when I used UEFI instead of leagcy bios. But with UEFI Linux sometimes the pci express card wasn't seen at all and only showed up when I unpluged the power cord of the PC.
This is so frustrating.
If I just simply clone the old linuxcnc 2.9.3 with a 4.xx Kernel all works. But the fresh installed linuxcnc does not work.
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09 Sep 2024 05:15 #309708
by cornholio
Replied by cornholio on topic Linuxcnc start disables Parallel port of PCI Express card
Might be worth looking at dmesg just after starting linuxcnc
So linuxcnc aborts running the config ?
Does linuxcnc report anything ?
So linuxcnc aborts running the config ?
Does linuxcnc report anything ?
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09 Sep 2024 10:52 #309729
by mBender
Replied by mBender on topic Linuxcnc start disables Parallel port of PCI Express card
When I wanted to post the dmesg output, of course it worked. Will keep an eye on it and let you know if it stops working again.
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09 Sep 2024 12:44 #309743
by tommylight
Replied by tommylight on topic Linuxcnc start disables Parallel port of PCI Express card
Most of the time, such issues are caused by dirty pins on the add on card as they get touched.
A good cleaning with alcohol should take care of that.
A good cleaning with alcohol should take care of that.
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