linux-kernel - [REGRESSION] drm/amd/dc: Add dc display driver (v2)

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Date:   Mon, 30 Apr 2018 11:14:50 -0400
From:   Joseph Salisbury <joseph.salisbury@...onical.com>
To:     harry.wentland@....com
Cc:     alexander.deucher@....com, alexander.deucher@....com,
        christian.koenig@....com, David1.Zhou@....com, airlied@...ux.ie,
        amd-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "1761751@...s.launchpad.net" <1761751@...s.launchpad.net>
Subject: [REGRESSION] drm/amd/dc: Add dc display driver (v2)

Hi Harry,

A kernel bug report was opened against Ubuntu [0].  After a kernel
bisect, it was found the following commit introduced the bug:

commit 4562236b3bc0a28aeb6ee93b2d8a849a4c4e1c7c
Author: Harry Wentland <harry.wentland@....com>
Date:   Tue Sep 12 15:58:20 2017 -0400

    drm/amd/dc: Add dc display driver (v2)

The regression was introduced as of v4.15-rc1 and still exists in
current mainline.  The commit does not need to be reverted to resolve
the bug.  Disabling the CONFIG_DRM_AMD_DC_PRE_VEGA option makes the bug
go away.

I was hoping to get your feedback, since you are the patch author.  Do
you think gathering any additional data will help diagnose this issue?

Thanks,

Joe

[0] http://pad.lv/1761751