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

----- Original Message ----- > On Thu, Feb 01, 2018 at 12:34:50PM +0100, Hans de Goede 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 > > Hi Hans, > > I didn't exactly play with the psr like you asked, but your blog intrigued > me to play with powertop again. > > On my Dell 5510 laptop, which has two graphics chips (intel for display, > nvidia for external displays), setting the following to good: > > Runtime PM for PCI Device NVIDIA Corporation GM107GLM [Quadro M1000M] > > dropped me from 14W down to 6-7W. And doubled my battery life. Considering > I normally don't connect up the external display, I find this a huge > savings. > > So indirectly I want to say thank you! FWIW, switcheroo-control is supposed to turn off the discrete device on boot, so you wouldn't need to do this. But it doesn't work with Secure Boot enabled because of the location of the vga_switcheroo in /sys (under debug).

Hi, On 01-02-18 15:59, Don Zickus wrote: > On Thu, Feb 01, 2018 at 12:34:50PM +0100, Hans de Goede 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 > > Hi Hans, > > I didn't exactly play with the psr like you asked, but your blog intrigued > me to play with powertop again. > > On my Dell 5510 laptop, which has two graphics chips (intel for display, > nvidia for external displays), setting the following to good: > > Runtime PM for PCI Device NVIDIA Corporation GM107GLM [Quadro M1000M] > > dropped me from 14W down to 6-7W. And doubled my battery life. Considering > I normally don't connect up the external display, I find this a huge > savings. > > So indirectly I want to say thank you! Interesting, nouveau.runpm defaults to 1, so I wonder why it is not doing this by default on your system. Can you file a bug against xorg-x11-drv-nouveau please and put the following people in the Cc:

Ben Skeggs <bskeggs(a)redhat.com&gt; Lyude Paul <lyude(a)redhat.com&gt; Hans de Goede <hdegoede(a)redhat.com&gt; Note Lyude works from the Westford office, not sure where you are located, but if you're also in Westford you might just want to drop by her desk :)