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The tpacpi_acpi_handle_locate function makes use of acpi_get_devices to locate handle for ACPI video by HID, the problem is, ACPI video node doesn't really have HID defined(i.e. no _HID control method is defined for video device), so.. that function would fail. This can be solved by enhancing the callback function for acpi_get_devices, where we can use acpi_device_hid function to check if the ACPI node corresponds to a video controller. In addition to that, the _BCL control method only exists under a video output device node, not a video controller device node. So to evaluate _BCL, we need the handle of a video output device node, which is child of the located video controller node from tpacpi_acpi_handle_locate. The two fix are necessary for some Thinkpad models to emit notification on backlight hotkey press as a result of evaluation of _BCL. Signed-off-by: Aaron Lu <aaron.lu@intel.com> Tested-by: Igor Gnatenko <i.gnatenko.brain@gmail.com> Acked-by: Henrique de Moraes Holschuh <hmh@hmh.eng.br> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> |
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| goldfish | ||
| olpc | ||
| x86 | ||
| Kconfig | ||
| Makefile | ||