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From: James Simmons <jsimmons@infradead.org>
To: "Rafael J. Wysocki" <rjw@sisk.pl>
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Subject: Re: [Q] How to tell we're using the KMS (during suspend/resume)
 outside the graphics driver
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References: <201003062236.09801.rjw@sisk.pl> <68676e01003090301s5bb40d4hac1224a9658339ac@mail.gmail.com> <201003091234.59598.rjw@sisk.pl>
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> > > Second, in the KMS case, we'd be able to skip the kernel VT switch, because
> > > the KMS driver uses its own framebuffer anyway.
> > >
> > > So, is there any reasonable way to check that from the outside of the graphics
> > > driver?  It should be general enough to cover the cases when there are two
> > > graphics adapters with different drivers in the system and so forth.
> > 
> > Inside the kernel? If you have a struct pci_dev you can get the
> > associated struct drm_device with pci_get_drvdata and then check the
> > KMS feature: drm_core_check_feature(dev, DRIVER_MODESET).
> 
> Yeah, I know that.
> 
> > I'm note sure how to check that a device is graphic card though :|
> 
> Well, that's the "outside of the graphics driver" part of my question. :-)

if ((pdev->class >> 8) == PCI_CLASS_DISPLAY_VGA)
	....