On 2 Nov 2017 12:07 pm, "AV" <volovics@ziggo.nl> wrote:
On Wed, 2017-11-01 at 11:35 +0000, James Hogarth wrote:
> On 31 October 2017 at 17:37, AV <volovics@ziggo.nl> wrote:
> > Hello,
> >
> > This concerns an Asus Zenbook with hybrid graphics (Intel/Nvidia).
> >
> > 1) There are 2 ways to deactivate the nouveau driver:
> >    by adding 'modprobe.nouveau=0' to the kernel cmd line OR
> >    by adding 'modprobe.blacklist=nouveau rd.blacklist=nouveau'.
> >    Which is to be preferred?
> >
> > 2) I do the above because there is as yet no Nvidia driver that
> >    gives a hybrid solution like under Windows and the Intel driver
> >    is more than enough for my needs.
> >    However when using a solution as described in 1) the Nvidia chip
> >    will still drain power. Is there anyway to deactivate the chip?
> >    (short of removing it from the motherboard if possible).
> >
> >
> If you cannot disable the NV chip in the BIOS/firmware then you have
> a
> couple of options ...
> By default PRIME *should* be working ... are you certain the NV chip
> is powered and drawing power?
> Check /sys/kernel/debug/vgaswitcheroo/switch (just cat it) and see if
> the chip is already marked OFF (this requires nouveau to be loaded as
> a driver IIRC so remove your blacklist).
> https://www.kernel.org/doc/html/v4.10/gpu/vga-switcheroo.html
> If that already shows it off then you don't need to do anything else
> as Intel will be default.
> Alternatively if that's not behaving as expected for you follow the
> instructions for the bumblebee implementation:
> https://fedoraproject.org/wiki/Bumblebee

Thanks for the reply. I am familiar with the PRIME/switcheroo routines.
However I am unable to set the NV chip into the OFF power state, it
remains in the DynOff state.
And you want to get rid of the nouveau driver as soon as possible
because it only has rudimentary support for the NV chip and regularly
freezes the laptop.
I also don't want to use bumblebee or the NV chip.
I am quite comfortable with the integrated Intel graphics and it
works without problems.

So the best option is to immediately edit the grub cmd line
at install and blacklist nouveau and after install make this

So I don't know if the NV chip is drawing power and I was
asking if anybody knows of ways to check and control outside
of the PRIME/switcheroo caboodle.

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DynOFF indicates the chip is off and not drawing anything that will make any difference.