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    SubjectRe: [Q] How to tell we're using the KMS (during suspend/resume) outside the graphics driver
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    On Tuesday 09 March 2010, Luca Tettamanti wrote:
    > On Sat, Mar 6, 2010 at 10:36 PM, Rafael J. Wysocki <rjw@sisk.pl> wrote:
    > > Hi,
    > >
    > > For at least two reasons it would be beneficial for some code outisde the
    > > graphics driver(s) to know if the KMS are used.
    > >
    > > First, in the non-KMS (ie. UMS) case we probably wouldn't want to call
    > > acpi_video_resume(), because that has a potential to mess up with the GPU
    > > (it actually is known to do that on at least one system).
    > >
    > > 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. :-)

    Rafael


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