linux-kernel - Linux 4.8-rc?: WARNING: at drivers/gpu/drm/i915/intel_pm.c:7866 sandybridge_pcode_write Missing switch case (16) in gen6_check_mailbox

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Date:   Tue, 06 Sep 2016 09:49:52 +0200
From:   linux@...elenboom.it
To:     Daniel Vetter <daniel.vetter@...el.com>
Cc:     intel-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org
Subject: Linux 4.8-rc?: WARNING: at drivers/gpu/drm/i915/intel_pm.c:7866 sandybridge_pcode_write Missing switch case (16) in gen6_check_mailbox_status

L.S.,

Since one of the last 4.8 RC's i'm getting the warning below when 
booting on my sandybridge based thinkpad.
 From what it seems the machine still works fine though.

--
Sander

[    2.846265] ------------[ cut here ]------------
[    2.846280] WARNING: CPU: 0 PID: 4 at 
drivers/gpu/drm/i915/intel_pm.c:7866 sandybridge_pcode_write+0x104/0x1e0
[    2.846282] Missing switch case (16) in gen6_check_mailbox_status
[    2.846284] Modules linked in:
[    2.846289] CPU: 0 PID: 4 Comm: kworker/0:0 Not tainted 
4.8.0-rc5-x220-20160905+ #1
[    2.846290] Hardware name: LENOVO 42912ZU/42912ZU, BIOS 8DET69WW 
(1.39 ) 07/18/2013
[    2.846297] Workqueue: events intel_gen6_powersave_work
[    2.846302]  0000000000000000 ffffffff8138bd84 ffff88030fd7bd78 
0000000000000000
[    2.846305]  ffffffff81062d84 ffff88030d490000 ffff88030fd7bdc8 
0000000000000000
[    2.846308]  ffff88030d49a438 ffff88030d498830 0000000000000000 
ffffffff81062dea
[    2.846309] Call Trace:
[    2.846319]  [<ffffffff8138bd84>] ? dump_stack+0x5c/0x78
[    2.846324]  [<ffffffff81062d84>] ? __warn+0xb4/0xd0
[    2.846328]  [<ffffffff81062dea>] ? warn_slowpath_fmt+0x4a/0x50
[    2.846333]  [<ffffffff814edf44>] ? 
sandybridge_pcode_write+0x104/0x1e0
[    2.846338]  [<ffffffff814eefd3>] ? 
intel_gen6_powersave_work+0x2a3/0x1400
[    2.846344]  [<ffffffff810781ea>] ? process_one_work+0x1ba/0x3d0
[    2.846348]  [<ffffffff81078445>] ? worker_thread+0x45/0x4e0
[    2.846351]  [<ffffffff81078400>] ? process_one_work+0x3d0/0x3d0
[    2.846355]  [<ffffffff8107d678>] ? kthread+0xb8/0xd0
[    2.846362]  [<ffffffff817cc8df>] ? ret_from_fork+0x1f/0x40
[    2.846365]  [<ffffffff8107d5c0>] ? kthread_worker_fn+0x180/0x180
[    2.846368] ---[ end trace da7b2ca8a6654bfa ]---