linux-kernel - PROBLEM: drm_vblank noise in dmesg on 5.4.0-rc6

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Message-ID: <20191105234524.GA27549@D-69-91-141-110.dhcp4.washington.edu>
Date:   Tue, 5 Nov 2019 18:45:24 -0500
From:   Stuart Little <achirvasub@...il.com>
To:     Alex Deucher <alexander.deucher@....com>,
        Christian König <christian.koenig@....com>,
        David Zhou <David1.Zhou@....com>,
        amd-gfx@...ts.freedesktop.org, David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        dri-devel@...ts.freedesktop.org,
        Maarten Lankhorst <maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>, Sean Paul <sean@...rly.run>
Cc:     LKML <linux-kernel@...r.kernel.org>
Subject: PROBLEM: drm_vblank noise in dmesg on 5.4.0-rc6

I am on an Intel(R) Core(TM)2 Duo CPU T5450 @ 1.66GHz laptop, running Debian 10.1 i686 with a custom-compiled 5.4.0-rc6 kernel (config attached). The laptop has a Radeon video card; the relevant output of 'lspci -k' is

01:05.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] RC410M [Mobility Radeon Xpress 200M]
        Subsystem: ASUSTeK Computer Inc. RC410M [Mobility Radeon Xpress 200M]
        Kernel driver in use: radeon
        Kernel modules: radeon

rc6 is giving me traces in dmesg complaining about drm_vblank (the trace is attached). The issue was not present in rc5.

I am sending the message to the addresses listed in the MAINTAINERS file of the current Linux tree under the headings

DRM DRIVERS
DRM DRIVERS AND MISC GPU PATCHES
RADEON and AMDGPU DRM DRIVERS

apologies if this is overly broad. 

View attachment "config-5.4.0-rc6-deb32" of type "text/plain" (148206 bytes)

View attachment "dmesg_5.4.0-rc6_drm-trace" of type "text/plain" (3160 bytes)