Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > linux.debian.bugs.dist > #1202577

Bug#1063161: Add amd_pmf module

Cross-posted to 2 groups.

Show all headers | View raw

[Multipart message — attachments visible in raw view] - view raw

On Friday, 28 June 2024 19:24:58 CEST Mario Limonciello wrote:
> On 6/28/2024 12:05, Diederik de Haas wrote:
> > On Friday, 28 June 2024 18:37:06 CEST Mario Limonciello wrote:
> >> On 6/28/2024 11:18, Diederik de Haas wrote:
> >>>> I don't think so.  I've never heard of this actually used in a desktop
> >>>> board.  It's for mobile designs AFAIK.
> >>> 
> >>> I can understand that the initial/original goal/target was mobile.
> >>> But is there a(ny) technical reason why it couldn't also support
> >>> 'desktop'
> >>> systems?
> >>> IIRC and IIUC it does need Zen 3, which my CPU/SoC does.
> >> 
> >> It needs information about the hardware thermal design to change the
> >> correct coefficients.
> > 
> > Isn't that something that AMD would know?
> 
> I have software interfaces that I can use to tell you what APU
> coefficient is currently programmed.  I can tell you what the MAX an APU
> can support is but I can't tell you what the "rest" of the hardware
> design can support.
> 
> This depends on hardware stuff.  For example:
> 1) how big of a heat pipe there is
> 2) how big of a power supply there is
> 3) how many fans there are
> 4) is there a beefy GPU sharing power
> 5) etc.
> 
> Even if you have the thermal headroom if you turn PPT limits up too much
> your GPU performance might suffer.

As this will normally be a headless system, I'm actually looking if I can turn 
the GPU off, *unless* there's an HDMI cable plugged in.
So (at least for now), the GPUs only function is to have a display when I need 
it for troubleshooting.

> Designers do thermal simulations to come up with the numbers for all
> this stuff and it's proprietary information to go with their design.
> 
> That's why it's encoded in BIOS or EC and OS will read it and offer the
> interface to the user.  I really don't think it makes sense in a design
> it yourself desktop.

Ah, ok. Clear :-)
I (initially) thought you meant hardware thermal design *of the CPU*, but I 
now know it's 'a bit' more then that.

Thanks,
  Diederik

Back to linux.debian.bugs.dist | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread

Thread

Bug#1063161: Add amd_pmf module Diederik de Haas <didi.debian@cknow.org> - 2024-06-28 17:50 +0200
  Bug#1063161: Add amd_pmf module Diederik de Haas <didi.debian@cknow.org> - 2024-06-28 18:30 +0200
    Bug#1063161: Add amd_pmf module Diederik de Haas <didi.debian@cknow.org> - 2024-06-28 19:10 +0200
      Bug#1063161: Add amd_pmf module Diederik de Haas <didi.debian@cknow.org> - 2024-06-28 19:50 +0200
        Bug#1063161: Add amd_pmf module Diederik de Haas <didi.debian@cknow.org> - 2024-06-28 20:00 +0200
          Bug#1063161: Add amd_pmf module Nathan MALO <nathan.malo@gmail.com> - 2024-07-01 17:30 +0200
            Bug#1063161: Add amd_pmf module Diederik de Haas <didi.debian@cknow.org> - 2024-07-01 17:40 +0200

csiph-web