Messages in this thread | | | Subject | Re: [PATCH v3 6/6] asus-wmi: Support the hardware GPU MUX on some laptops | From | Luke Jones <> | Date | Fri, 12 Aug 2022 10:01:51 +1200 |
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Hi Hans,
On Thu, 2022-08-11 at 15:53 +0200, Hans de Goede wrote: > Hi, > > On 8/9/22 04:50, Luke D. Jones wrote: > > Support the hardware GPU MUX switch available on some models. This > > switch can toggle the MUX between: > > > > - 0, Dedicated mode > > - 1, Optimus mode > > > > Optimus mode is the regular iGPU + dGPU available, while dedicated > > mode switches the system to have only the dGPU available. > > > > Signed-off-by: Luke D. Jones <luke@ljones.dev> > > I see that you have replied to this that it needs more work. > > Besides it needing more work, ideally this should hook into > the existing vga-switcheroo mechanism for this. Can you take > a look at that please? > > I think this might be the first non GPU driver doing vga- > switcheroo stuff. So this may be something to discuss > on the dri-devel list.
I'm not sure how this would work. In typical ASUS fashion they do non- standard stuff. This switch is a basic toggle that requires a reboot to enable after writing to the ACPI method, after reboot the dGPU becomes the only visible GPU on the system and (this GPU) can not be suspended.
In short: it toggles the laptop from discrete-only mode, and optimus mode, requiring a reboot to switch.
From what I understand of switcheroo it is more to manage having dual (or more) GPU available during runtime, and manage the power states, offload etc.
I have a vastly improved patch for this prepared now. Because of how the actual feature works (and the above explanation) it must be under the asus-nb-wmi sysfs (next to the dgpu_disable and egpu_enable toggles which are also unusual and non-standard work-arounds of Windows issues).
Kind regards, Luke.
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