Re: Testers for LCD Panel Self Refresh on laptops with Intel graphics wanted

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On Thu, Feb 1, 2018 at 11:34 AM, Hans de Goede <hdegoede@xxxxxxxxxx> wrote:
>
> Hi All,
>
> For the "Improved Laptop Battery Life" feature:
> https://fedoraproject.org/wiki/Changes/ImprovedLaptopBatteryLife
>
> I'm working on for Fedora 28 I would like to also try and enable
> Panel Self Refresh on laptops with Intel graphics, some quick tests
> have shown this to save another 0.5W (when idle / nothing on the
> screen changes). This is currently off be default because it is
> known to cause issues on some devices. So I think we will probably
> need a white- or black-list. But first we need more data on this.
>
> If you can spare 10 minutes, please see my blogpost for how to test
> this and send me a mail with the info request in the blogpost:
> https://hansdegoede.livejournal.com/18653.html
>

I suspect that the results may be odd.  After falling into a rabbit
hole when I tried to do this test, I learned a few things about the
i915 driver's PSR support:

 - Intel doesn't currently have any working CI coverage for PSR.

 - There's an Intel person who seems to be actively trying to fix PSR.

 - PSR on 4.15 on newish hardware (at least Skylake) is completely broken.

 - There are other known bugs.

So I'm not sure that trying to tabulate PSR functionality based on
panel type seems like it may be the wrong approach.
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