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    SubjectRe: [PATCH 5.10 637/717] drm/amd/display: Fix memory leaks in S3 resume
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    On 28.12.2020 13:50, Greg Kroah-Hartman wrote:
    > From: Stylon Wang <stylon.wang@amd.com>
    >
    > commit a135a1b4c4db1f3b8cbed9676a40ede39feb3362 upstream.
    >
    > EDID parsing in S3 resume pushes new display modes
    > to probed_modes list but doesn't consolidate to actual
    > mode list. This creates a race condition when
    > amdgpu_dm_connector_ddc_get_modes() re-initializes the
    > list head without walking the list and results in memory leak.

    This commit is causing me problems on 5.10.4: when I turn off the
    display (a LG TV in this case), and turn it back on again later there is
    no video output and I get the following in the kernel log:

    [ 8245.259628] [drm:dm_restore_drm_connector_state [amdgpu]] *ERROR*
    Restoring old state failed with -12

    I've found another report on this commit as well:
    https://bugzilla.kernel.org/show_bug.cgi?id=211033

    And I suspect this is the same:
    https://bugs.archlinux.org/task/69202

    Reverting it from 5.10.4 makes things behave again.

    Have not tested 5.4.86 or 5.11-rc.

    I'm using a RX570 Polaris based card.

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