Re: Testers for LCD Panel Self Refresh on laptops with Intel graphics wanted

[Hans de Goede]

Hi Andrew,

On 05-02-18 23:02, Andrew Lutomirski wrote:

On Thu, Feb 1, 2018 at 11:34 AM, 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



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.


Thank you for your poking around wrt this. Can you send me an (off-list)
email with the contact info for the Intel person you are talking about,
before spending more time on this I would like to touch base with him/her.

Regards,

Hans
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Re: Testers for LCD Panel Self Refresh on laptops with Intel graphics wanted

[Hans de Goede]

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 
Lyude Paul 
Hans de Goede 

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 :)

Regards,

Hans
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Re: EXTERNAL: Re: Testers for LCD Panel Self Refresh on laptops with Intel graphics wanted

[Hans de Goede]

Hi,

On 01-02-18 16:33, Wells, Roger K. wrote:

On 02/01/2018 10:21 AM, Ian Pilcher wrote:

On 02/01/2018 05:34 AM, Hans de Goede wrote:

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


Should this testing be done on AC power or unplugged (or does it not
matter)?


Unplugged, because that is the only state in which powertop can
measure energy consumption.


also, how to determine if "i915.enable_psr=1" was entered correctly and 
accepted?


I've updated my blogpost with some info on how to check that
adding that option actually does anything, see:

https://hansdegoede.livejournal.com/18653.html

Regards,

Hans
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Re: Testers for LCD Panel Self Refresh on laptops with Intel graphics wanted

[Igor Gnatenko]

-BEGIN PGP SIGNED MESSAGE-
Hash: SHA256

On Thu, 2018-02-01 at 12:34 +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

Thanks a lot for working on this! I've sent you results from my laptop in
private email. Looking forward to have PSM enabled by default (at least on my
laptop)!
- -- 
- -Igor Gnatenko
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Re: EXTERNAL: Re: Testers for LCD Panel Self Refresh on laptops with Intel graphics wanted

[Ian Pilcher]

On 02/01/2018 09:33 AM, Wells, Roger K. wrote:
also, how to determine if "i915.enable_psr=1" was entered correctly and 
accepted?




$ sudo cat /sys/module/i915/parameters/enable_psr

--

Ian Pilcher arequip...@gmail.com
 "I grew up before Mark Zuckerberg invented friendship" 

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Re: EXTERNAL: Re: Testers for LCD Panel Self Refresh on laptops with Intel graphics wanted

[Wells, Roger K.]

On 02/01/2018 10:21 AM, Ian Pilcher wrote:

On 02/01/2018 05:34 AM, Hans de Goede wrote:

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


Should this testing be done on AC power or unplugged (or does it not
matter)?

also, how to determine if "i915.enable_psr=1" was entered correctly and 
accepted?


--
Roger Wells, P.E.
leidos
221 Third St
Newport, RI 02840
401-847-4210 (voice)
401-849-1585 (fax)
roger.k.we...@leidos.com
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Re: Testers for LCD Panel Self Refresh on laptops with Intel graphics wanted

[Ian Pilcher]

On 02/01/2018 05:34 AM, Hans de Goede wrote:

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


Should this testing be done on AC power or unplugged (or does it not
matter)?

--

Ian Pilcher arequip...@gmail.com
 "I grew up before Mark Zuckerberg invented friendship" 

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Re: Testers for LCD Panel Self Refresh on laptops with Intel graphics wanted

[Patrick O'Callaghan]

On Thu, 2018-02-01 at 12:34 +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

Wouldn't this be better on the Fedora Test list?

poc
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Testers for LCD Panel Self Refresh on laptops with Intel graphics wanted

[Hans de Goede]

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

Regards,

Hans
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