On Tuesday 09 March 2010, Luca Tettamanti wrote: > On Sat, Mar 6, 2010 at 10:36 PM, Rafael J. Wysocki <rjw@xxxxxxx> 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 -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
