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.
Signed-off-by: Alex Deucher <alexander.deucher@xxxxxxx>
---
drivers/gpu/drm/radeon/radeon_atpx_handler.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/drivers/gpu/drm/radeon/radeon_atpx_handler.c b/drivers/gpu/drm/radeon/radeon_atpx_handler.c
index 95f4fea..3e24fe0 100644
--- a/drivers/gpu/drm/radeon/radeon_atpx_handler.c
+++ b/drivers/gpu/drm/radeon/radeon_atpx_handler.c
@@ -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;
--
2.5.5
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