preempt rt buster iso Mesa problem

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06 Apr 2021 06:56 #205044 by jsskangas
Hello

I have been trying to get linuxcnc fresh install running.

Machine has been run with same pc and same mesacards before.
HW is 100% sure to work.
Ini files and hal files are ok, have been running this setup day ago.

Problem came after installing newer linuxcnc:
I have downloaded latest iso from linuxcnc.org --> LinuxCNC 2.8.0 Debian 10 Buster PREEMPT-RT ISO

Setup to PC goes smooth without any errors.
Linuxcnc axis sim runs fine, no problem.

But I can not get mesacards to run.
It gives following error:



I done this setup 3 times and it gives same error.
Any idea what goes wrong?
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06 Apr 2021 10:03 #205059 by tommylight
It says "using posix non realtime" so that is not the kernel with the official LinuxCNC distro.
Did you upgrade the kernel ? It should not be upgraded .
hold down the shift key when you boot the pc and choose the RT kernel at the grub menu, test again.

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06 Apr 2021 10:15 #205060 by jsskangas
OK
That is odd, cause it is a livecd install?

But I will try it.

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06 Apr 2021 10:36 #205063 by jsskangas
No help.
Linux was running with real-time mode.
And I get same error as before.


Is LinuxCNC 2.8.0 Debian 10 Buster PREEMPT-RT ISO compatible with 6i25-7i77 combo?

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06 Apr 2021 12:33 #205090 by tommylight
It is compatible, moving on.
What does
uname -a
in a terminal return?
For updating and upgrading use:
sudo apt-get update
sudo apt-get dist-upgrade
never use "sudo apt-get upgrade" on a LinuxCNC distribution as that will most probably replace the kernel.

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06 Apr 2021 13:40 - 06 Apr 2021 13:42 #205108 by jsskangas
hello



Is LinuxCNC 2.8.0 Debian 10 Buster PREEMPT-RT ISO compatible with 6i25-7i77 combo of the box?
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Last edit: 06 Apr 2021 13:42 by jsskangas.

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06 Apr 2021 13:50 #205110 by jsskangas
Hello

I tried to load hostmot2 and it gives error
Cannot gain I/O privileges...

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06 Apr 2021 14:31 #205120 by PCW
The permissions issue is not really Mesa related (if would fail on parallel ports as well)

It looks like a LinuxCNC install problem of some kind but why don't others see the same issue?

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06 Apr 2021 14:56 #205123 by jsskangas
Hello

I tried with other older PC and that one does not have this "cannot gain I/O privileges" problem.

Any ideal ?

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06 Apr 2021 15:19 #205127 by PCW
Someone else had a similar issue:

forum.linuxcnc.org/9-installing-linuxcnc...i-o-privileges-error

Maybe BIOS settngs related?

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