Re: REGRESSION 3.14 i915 warning & mouse cursor vanishing

[Imre Deak <imre.deak@intel.com>]

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@uplinklabs.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.

--Imre