Commit cf26f908 authored Jun 01, 2016 by Alex Deucher

drm/radeon: disable power control on hybrid laptops



Windows 10 (and some 8.1) systems use standardized
ACPI calls for hybrid laptops to control dGPU power.
Detect those cases and disable the AMD specific ATPX
power control.

Reviewed-by: Hawking Zhang <Hawking.Zhang@amd.com>
Acked-by: Christian König <christian.koenig@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

parent d85555f8

drivers/gpu/drm/radeon/radeon_atpx_handler.c

+5 −0

Original line number	Diff line number	Diff line
		@@ -182,6 +182,11 @@ static int radeon_atpx_validate(struct radeon_atpx *atpx)
		ATPX_DFP_SIGNAL_MUXED))
		atpx->functions.disp_mux_cntl = true;

		if (valid_bits & ATPX_MS_HYBRID_GFX_SUPPORTED) {
		printk("Hybrid Graphics, ATPX dGPU power cntl disabled\n");
		atpx->functions.power_cntl = false;
		}

		kfree(info);
		}
		return 0;