On Fri, Feb 02, 2018 at 10:11:03AM +0100, Hans de Goede wrote:
> 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:

I did, bz: https://bugzilla.redhat.com/show_bug.cgi?id=1541495

This may be the reason:

[14321.977201] pci 0000:01:00.0: optimus capabilities: enabled, status
dynamic power, hda bios codec supported
[14321.977205] VGA switcheroo: detected Optimus DSM method
\_SB_.PCI0.PEG0.PEGP handle
[14321.977207] nouveau: detected PR support, will not use DSM
[14321.977236] nouveau 0000:01:00.0: enabling device (0000 -> 0003)
[14321.977376] nouveau 0000:01:00.0: unknown chipset (ffffffff)
[14321.977381] nouveau: probe of 0000:01:00.0 failed with error -12

> 
> 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 :)

She switched to the Boston office, so I can't walk over anymore.  But I can
still reach out to her.

Thanks!

Cheers,
Don
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