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:

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:

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

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 <bske...@redhat.com>
Lyude Paul <ly...@redhat.com>
Hans de Goede <hdego...@redhat.com>

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 :)


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