drm/amd/display: fix dpms_off issue when disabling bios mode

[Why]
disable_vbios_mode_if_required() will set dpms_off to false
during boot when pixel clk dismatches with driver requires.
This will cause extra backlight on and off if OS call 2
times setmode.

[How]
Set dpms_off to true to keep power_off and
let OS control BL by display's powerState.

Reviewed-by: Aric Cyr <[e-mail]>
Acked-by: Tom Chung <[e-mail]>
Signed-off-by: Zhongwei Zhang <[e-mail]>
Tested-by: Daniel Wheeler <[e-mail]>
Signed-off-by: Alex Deucher <[e-mail]>

drivers/gpu/drm/amd/display/dc/core/dc.c

···
 
 					if (pix_clk_100hz != requested_pix_clk_100hz) {
 						core_link_disable_stream(pipe);
-						pipe->stream->dpms_off = false;
+						pipe->stream->dpms_off = true;
 					}
 				}
 			}