Re: [PATCH 2/2] ACPI / osi: add DMI quirk for Dell systems

[Andy Shevchenko <andriy.shevchenko@linux.intel.com>]

On Tue, 2018-02-06 at 00:45 +0000, Mario.Limonciello@dell.com wrote:

> > > > Playing with OSI string is a bad idea. I wouldn't do anything
> > > > while
> > > > Rafael, or even Len can confirm that is the right thing to do.
> > > > 
> > > > For me, AFAIK we need to be bug-to-bug compatible with Windows
> > > > (at least
> > > > on ACPICA side), so, what Windows exactly does on such laptops?
> > > > 
> > > 
> > > The issue that's being worked around isn't an ACPICA interpreter
> > > issue, but it's
> > > a graphics device configuration issue.

Then clearly nothing to do with OSI strings here, right?

> > > Windows expects to use RTD3 on the NVIDIA GPU but Linux drivers
> > > don't.  It leads to system hangs on the Linux side.
> > 
> > Can we adjust Linux drivers to do the right thing?

+100

> >  Or is it regarding
> > the binary NVIDIA blob?

nVidia vs. Linux again? :-)

> 
> Neither Nouveau nor the NVIDIA blob have support for RTD3.
> 
> Last I heard it's waiting on NVIDIA releasing something Nouveau
> needs.  So.. Eventually?  For now it's better to not hang though.

Hmm... While you are talking sense, the patch itself looks like an ugly
hack.

> That's part of why we wanted to enable this via a transient OSI
> string,
> to let this be removed by Linux whenever the driver does grow support.

So, means "never" then? (Assume a bit of irony here)

I don't know how it feels for maintainers, for me it's quite unlikely to
go (at least in this shape).

I'm sorry I can't be much constructive here, I heard Len once about OSI
huge abuse by almost every party. I would rather let him speak on the
matter.

-- 
Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Intel Finland Oy