Bug 210867

Created attachment 294309 [details]
Kernel config file

After upgrading from 5.9.14 to 5.10.1, I get a black screen when I boot. The video card is an RX580. I bisected the issue to this commit:

commit 8353d30e747f4e5cdd867c6b054dbb85cdcc76a9
Author: Chiawen Huang <chiawen.huang@amd.com>
Date:   Fri Sep 25 10:54:55 2020 -0400

    drm/amd/display: disable stream if pixel clock changed with link active
    
    [Why]
    Vbios uses preferred timing to turn on edp but OS could use other
    timing.  If change pixel clock when link active, there is unexpected
    garbage on monitor.
    
    [How]
    Once pixel clock changed, the driver needs to disable stream.
    
    Signed-off-by: Chiawen Huang <chiawen.huang@amd.com>
    Reviewed-by: Tony Cheng <Tony.Cheng@amd.com>
    Acked-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
    Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

diff --git a/drivers/gpu/drm/amd/display/dc/core/dc.c b/drivers/gpu/drm/amd/display/dc/core/dc.c
index 76946a7d47ca..2a725a5fba40 100644
--- a/drivers/gpu/drm/amd/display/dc/core/dc.c
+++ b/drivers/gpu/drm/amd/display/dc/core/dc.c
@@ -864,7 +864,6 @@ static void disable_vbios_mode_if_required(
                if (stream->link->local_sink &&
                        stream->link->local_sink->sink_signal == SIGNAL_TYPE_EDP) {
                        link = stream->link;
-                       break;
                }
 
                if (link != NULL) {


Reverting this commit allows my system to boot.