Disable power management on i915

Disable power management on i915

[Sanchez, AdolfoX]

[-- Attachment #1.1: Type: text/plain, Size: 316 bytes --]

Hello.

I would like to know what is the best way to disable power management on the GPU unit, the purpose is to avoid GPU power transitions to avoid voltage swings.

Additional information:
Platform: Bay Trail J1900
O.S: Linux Kernel 4.4

Any help would be appreciated.

Best Regards,
Adolfo Sanchez.


[-- Attachment #1.2: Type: text/html, Size: 2527 bytes --]

[-- Attachment #2: Type: text/plain, Size: 160 bytes --]

_______________________________________________
Intel-gfx mailing list
Intel-gfx@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/intel-gfx

Re: Disable power management on i915

[Joonas Lahtinen]

On ma, 2016-08-01 at 20:08 +0000, Sanchez, AdolfoX wrote:
> Hello.
>  
> I would like to know what is the best way to disable power management
> on the GPU unit, the purpose is to avoid GPU power transitions to
> avoid voltage swings.

i915.enable_rc6=0 would be a start. Do you also want to fix the GPU
frequency?

May I also ask why you want to do such thing?

Regards, Joonas

>  
> Additional information:
> Platform: Bay Trail J1900
> O.S: Linux Kernel 4.4
>  
> Any help would be appreciated.
>  
> Best Regards,
> Adolfo Sanchez.
>  
> _______________________________________________
> Intel-gfx mailing list
> Intel-gfx@lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/intel-gfx
-- 
Joonas Lahtinen
Open Source Technology Center
Intel Corporation

_______________________________________________
Intel-gfx mailing list
Intel-gfx@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/intel-gfx

Re: Disable power management on i915

[Sanchez, AdolfoX]

Hello Joonas,

Thanks for your answer.
It is a test related for this bug: https://bugzilla.kernel.org/show_bug.cgi?id=109051

Best Regards,
Adolfo Sanchez


-----Original Message-----
From: Joonas Lahtinen [mailto:joonas.lahtinen@linux.intel.com] 
Sent: Tuesday, August 02, 2016 1:48 AM
To: Sanchez, AdolfoX <adolfox.sanchez@intel.com>; intel-gfx@lists.freedesktop.org
Subject: Re: [Intel-gfx] Disable power management on i915

On ma, 2016-08-01 at 20:08 +0000, Sanchez, AdolfoX wrote:
> Hello.
>  
> I would like to know what is the best way to disable power management 
> on the GPU unit, the purpose is to avoid GPU power transitions to 
> avoid voltage swings.

i915.enable_rc6=0 would be a start. Do you also want to fix the GPU frequency?

May I also ask why you want to do such thing?

Regards, Joonas

>  
> Additional information:
> Platform: Bay Trail J1900
> O.S: Linux Kernel 4.4
>  
> Any help would be appreciated.
>  
> Best Regards,
> Adolfo Sanchez.
>  
> _______________________________________________
> Intel-gfx mailing list
> Intel-gfx@lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/intel-gfx
--
Joonas Lahtinen
Open Source Technology Center
Intel Corporation

_______________________________________________
Intel-gfx mailing list
Intel-gfx@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/intel-gfx

Re: Disable power management on i915

[Joonas Lahtinen]

On ti, 2016-08-02 at 21:07 +0000, Sanchez, AdolfoX wrote:
> Hello Joonas,
> 
> Thanks for your answer.
> It is a test related for this bug: https://bugzilla.kernel.org/show_bug.cgi?id=109051
> 

The original FDO bug which contains the steps of the debugging for i915
driver:

https://bugs.freedesktop.org/show_bug.cgi?id=88012

Do note that the bug was closed for i915 as it figured out to be CPU
power management problem, GPU power transition just made the unstable
tower topple.

Regards, Joonas

> Best Regards,
> Adolfo Sanchez
> 
> 
> -----Original Message-----
> From: Joonas Lahtinen [mailto:joonas.lahtinen@linux.intel.com] 
> Sent: Tuesday, August 02, 2016 1:48 AM
> To: Sanchez, AdolfoX <adolfox.sanchez@intel.com>; intel-gfx@lists.freedesktop.org
> Subject: Re: [Intel-gfx] Disable power management on i915
> 
> On ma, 2016-08-01 at 20:08 +0000, Sanchez, AdolfoX wrote:
> > 
> > Hello.
> >  
> > I would like to know what is the best way to disable power management 
> > on the GPU unit, the purpose is to avoid GPU power transitions to 
> > avoid voltage swings.
> i915.enable_rc6=0 would be a start. Do you also want to fix the GPU frequency?
> 
> May I also ask why you want to do such thing?
> 
> Regards, Joonas
> 
> > 
> >  
> > Additional information:
> > Platform: Bay Trail J1900
> > O.S: Linux Kernel 4.4
> >  
> > Any help would be appreciated.
> >  
> > Best Regards,
> > Adolfo Sanchez.
> >  
> > _______________________________________________
> > Intel-gfx mailing list
> > Intel-gfx@lists.freedesktop.org
> > https://lists.freedesktop.org/mailman/listinfo/intel-gfx
> --
> Joonas Lahtinen
> Open Source Technology Center
> Intel Corporation
> 
-- 
Joonas Lahtinen
Open Source Technology Center
Intel Corporation
_______________________________________________
Intel-gfx mailing list
Intel-gfx@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/intel-gfx