On Thu, Feb 1, 2018 at 11:34 AM, Hans de Goede <hdegoede(a)redhat.com> 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.