[Bug 213779] New: Screen stays blank on resume. from hibernate

[bugzilla-daemon@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=213779

            Bug ID: 213779
           Summary: Screen  stays blank on resume. from hibernate
           Product: Drivers
           Version: 2.5
    Kernel Version: 5.13
          Hardware: x86-64
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: high
          Priority: P1
         Component: Video(DRI - non Intel)
          Assignee: drivers_video-dri@kernel-bugs.osdl.org
          Reporter: alex14641@yahoo.com
        Regression: No

If I close my laptop lid and reopen it, the screen stays blank. Reverting the
following commit fixes the issue:

commit 9127daa0a8d88a6e6452eb8b7c9be4c3f42a867e
Author: Stylon Wang <stylon.wang@amd.com>
Date:   Tue Mar 2 19:25:56 2021 +0800

    drm/amd/display: Guard ASSR with internal display flag

    [Why]
    ASSR enabling only considers capability declared in DPCD.
    We also need to check whether the connector is internal.

    [How]
    ASSR enabling need to check both DPCD capability and internal display
    flag.

    Signed-off-by: Stylon Wang <stylon.wang@amd.com>
    Reviewed-by: Harry Wentland <Harry.Wentland@amd.com>
    Acked-by: Anson Jacob <Anson.Jacob@amd.com>
    Tested-by: Dan Wheeler <daniel.wheeler@amd.com>
    Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

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