From: Luke Jones <luke@ljones.dev>
To: Lukas Wunner <lukas@wunner.de>
Cc: hdegoede@redhat.com, markgross@kernel.org,
platform-driver-x86@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH] asus-wmi: Support the hardware GPU MUX on some laptops
Date: Mon, 15 Aug 2022 09:44:35 +1200 [thread overview]
Message-ID: <BEKMGR.6HATWYKRRTJQ1@ljones.dev> (raw)
In-Reply-To: <20220814104210.GA22519@wunner.de>
On Sun, Aug 14 2022 at 12:42:10 +0200, Lukas Wunner <lukas@wunner.de>
wrote:
> On Sun, Aug 14, 2022 at 09:09:43PM +1200, Luke Jones wrote:
>> On Sat, 2022-08-13 at 12:55 +0200, Lukas Wunner wrote:
>> > On Sat, Aug 13, 2022 at 09:26:24PM +1200, 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.
>> >
>> > Could you please integrate this with the framework provided by:
>> >
>> > include/linux/vga_switcheroo.h
>> > drivers/gpu/vga/vga_switcheroo.c
>> >
>> > vga_switcheroo will then automatically expose a sysfs interface.
>>
>> I did investigate this first before submitting. The way asus does
>> it is
>> not standard at all. On switch you must reboot, and the change isn't
>> reflected by the ACPI get method until reboot. It's very reflective
>> of
>> how they used dgpu_disable to work around windows issues that we do
>> in
>> Linux by removing the device from the device tree.
>>
>> The key thing is a reboot is required. This is not done on-the-fly.
>> I
>> have a two year old GX502 which has the same method as exposed here,
>> and also a 2022 TUF laptop with same method. My understanding of
>> this
>> pariicular method is that it isn't the same one as what Nvidia is
>> advertising, and ASUS is perhaps misadvertising it - the suspision
>> is
>> raised by the fact that my GX502 machine predates what Nvidia is
>> advertising.
>
> I see, thanks for the explanation. You may want to add that
> background information to the commit message if/when respinning.
> Indeed vga_switcheroo facilitates GPU switching at runtime,
> not upon next reboot.
>
> Thanks,
>
> Lukas
Good point, yes I will do that after reviews.
next prev parent reply other threads:[~2022-08-14 21:45 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-08-13 9:26 [PATCH] asus-wmi: Support the hardware GPU MUX on some laptops Luke D. Jones
2022-08-13 10:55 ` Lukas Wunner
2022-08-14 9:09 ` Luke Jones
2022-08-14 10:42 ` Lukas Wunner
2022-08-14 21:44 ` Luke Jones [this message]
2022-08-16 4:16 ` Mario Limonciello
2022-08-21 23:07 ` Luke Jones
2022-08-22 15:43 ` Limonciello, Mario
2022-08-24 12:40 ` Hans de Goede
2022-08-24 12:53 ` Mario Limonciello
2022-08-24 13:03 ` Hans de Goede
2022-08-24 13:09 ` Mario Limonciello
2022-08-24 13:49 ` Hans de Goede
2022-08-24 13:55 ` Mario Limonciello
2022-08-28 8:05 ` Luke Jones
2022-08-29 15:03 ` Limonciello, Mario
2022-08-24 13:51 ` Hans de Goede
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