linux-kernel - Re: [Intel-gfx] REGRESSION 3.14 i915 warning & mouse cursor vanishing

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Date:	Tue, 15 Apr 2014 16:34:04 -0700
From:	Steven Noonan <steven@...inklabs.net>
To:	imre.deak@...el.com
Cc:	Daniel Vetter <daniel@...ll.ch>, David Airlie <airlied@...ux.ie>,
	intel-gfx@...ts.freedesktop.org,
	Linux Kernel mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [Intel-gfx] REGRESSION 3.14 i915 warning & mouse cursor vanishing

On Tue, Apr 15, 2014 at 12:59 PM, Imre Deak <imre.deak@...el.com> wrote:
> On Tue, 2014-04-15 at 21:43 +0200, Daniel Vetter wrote:
>> On Mon, Apr 14, 2014 at 11:56:03AM -0700, Steven Noonan wrote:
>> > On Mon, Apr 14, 2014 at 11:35:05AM -0700, Keith Packard wrote:
>> > > Steven Noonan <steven@...inklabs.net> writes:
>> > >
>> > > > Was using my machine normally, then my mouse cursor vanished. After switching
>> > > > to a VT and back to X11, my cursor came back. But I did notice a nasty trace in
>> > > > dmesg (below).
>> > >
>> > > I don't think the trace below is related to the cursor disappearing.
>> >
>> > Any idea what the trace is all about then? Seems it has something to do
>> > with runtime power management (maybe my aggressive kernel command-line
>> > options are triggering it).
>>
>> Please test without them. Currently runtime pm should be disabled still on
>> vlv (since it's incomplete in 3.14). If you've force-enabled that then you
>> get to keep all pieces ;-)
>>
>> In general don't set any i915 options if you're not a developer or someone
>> else who _really_ knows what's going on.
>
> Note that the lspci output and the
>
> [ 1795.275026] [drm:hsw_unclaimed_reg_clear] *ERROR* Unknown unclaimed
> register before writing to 70084
>
> line suggests HSW and the specs for ThinkPad Yoga suggests the same. But
> I don't know how the vlv_* functions can possible end up in those traces
> then, perhaps just a coincidence, random data on stack?
>
> For HSW the rc6 kernel option shouldn't make a difference.

Correct, it's Haswell.
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