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