Real time for Ubuntu Studio 10.04 amd64

Oleg Ivanenko oivanenko at
Mon Jul 12 13:04:50 BST 2010

Hi, Ralf!

2010/7/12 Ralf Mardorf <ralf.mardorf at>

> Thank you, unfortunately 2.6.33-23-realtime amd64 results with 'ACPI:
> Expecting a [Reference] package element, found type 0' and a login for
> text mode. FWIW I didn't log in and tested to start x or gdm.
> > Personally I have installed(default Ubunto Studio meta-package
> > linux-rt):
> > linux-image-2.6.31-11-rt
> > Linux kernel image for version 2.6.31 on Ingo Molnar's full real time
> > preemption patch
> This is one of the kernels that stops booting with the message 'mount:
> mounting none on /dev failed: No such device.'

I have such message too but it is not stops booting and not affects my work.
I have no idea what is this exactly :)

> Is your machine an AMD dual core too and is the architecture of your 64
> Studio also amd64, but x86?

I have machine with x86.

> Perhaps it has to do with the NVIDIA graphics? Perhaps I should generate
> a xorg.conf by running 'sudo X -configure' and test the vesa driver. I
> dunno.

Yes, I have NVIDIA videocard and it is the reason why I still use 2.6.31
kernel -- it still works with this kernel.

> The eye-catching thing regarding to 'mount: mounting none on /dev
> failed: No such device.' is
> # cat config-2.6.31-11-rt | grep CONFIG_DEVTMPFS
> # cat config-2.6.32-23-preempt | grep CONFIG_DEVTMPFS
> that there's no output for 2.6.31-11-rt.

May be this is a good point. But I don't dig with it, just stop to use new
kernels temporarily and still using 2.6.31-rt

One more significant(for me) reason for still using 2.6.31, except
nvidia-problem,  is that I find out that command ps output was somehow
changed in subsequent kernels, so steps starts from 3 from is not working.

Truly yours, Oleg Ivanenko aka Ash
[if it wasn't so sad, it would be funny]
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