Re: [PATCH] drm/i915: apply the PCI_D0/D3 hibernation workaround everywhere on pre GEN6

Pavel Machek
2015-07-01T09:51:27Z

> > > - Embedded panels have a well defined shutdown sequence. We
don't

> > > have
> > > any good reason to not follow this, in fact for some panels the
> > > subsequent reinitialization could be problematic in case of a hard
> > > power-off. (Thanks to Jani for this info)
> >
> > Please cite concrete example. I have yet to see machine that would not
> > power up on forced power down. In fact, I argue that such machine
> > would be very broken, and that such machine does not exist. While we
> > have these real machines broken:
> >
> > > + * Lenovo Thinkpad X301, X61s, X60, T60, X41
> > > + * Fujitsu FSC S7110
> > > + * Acer Aspire 1830T
> >
> > What makes you think that BIOS writers will do something different for
> > Gen6+ hardware? X301 is not that old.
>
> Thinkpad X1 Carbon (IVB) is perfectly happy with the D3, so clearly
> something changed for Lenovo at least. And most machines (old and new)
> have no problems whatsoever with the D3.

Well, one machine being happy does not matter that much... as going to
D3 has no real benefits.

> It might be interesting to see if hibernate even works in Windows
> without some vendor driver on these machines.

I don't have windows nearby..
Pavel
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