Re: [PATCH 1/1] drm: i915: don't use OpRegion for XPS 13 IvyBridge

[Jani Nikula <jani.nikula@linux.intel.com>]

On Tue, 30 Aug 2016, Martin van Es <martin@mrvanes.com> wrote:
> Hi Andrea,
>
> I'd be happy to test, but what am I testing when applying these boot 
> parameters? In other words: what should I report?

The point is, for an ivybridge setting those parameters should not make
*any* difference.

BR,
Jani.


>
> And just to be sure, I THINK I own an IVB but intel is not very vocal about it 
> when searching for familyname. I have a
>
> vendor_id       : GenuineIntel
> cpu family      : 6
> model           : 58
> model name      : Intel(R) Core(TM) i7-3537U CPU @ 2.00GHz
> stepping        : 9
> microcode       : 0x17
>
> Regards,
> Martin
>
> On maandag 29 augustus 2016 20:48:43 CEST Andrea Arcangeli wrote:
>> On Mon, Aug 29, 2016 at 10:24:38AM +0300, Jani Nikula wrote:
>> > If it's an Iybridge, there's no low vswing, and that explanation is
>> > false. You can verify by trying i915.edp_vswing=1 or i915.edp_vswing=2
>> > on an unpatched kernel.
>> 
>> CC'ed Martin who filed the bz, he can reproduce too
>> https://bugzilla.kernel.org/show_bug.cgi?id=151731
>> 
>> Since you can reproduce would you have the time to test the two above
>> options on stock 4.7.x/4.8-rc and help tracking this down? I'm afraid
>> I won't be able to test it today and I'll be mostly offline for a week
>> starting tomorrow.
>> 
>> Thanks,
>> Andrea

-- 
Jani Nikula, Intel Open Source Technology Center
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