linux-kernel - Re: [PATCH v1] platform/x86/amd: pmc: Add Lenovo Legion Go 2 to pmc quirk list

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Message-ID: <b50be0eb-19c3-410d-839b-65c6a73ab6b9@kernel.org>
Date: Wed, 8 Oct 2025 10:14:18 -0500
From: Mario Limonciello <superm1@...nel.org>
To: Antheas Kapenekakis <lkml@...heas.dev>
Cc: Shyam-sundar.S-k@....com, hansg@...nel.org,
 ilpo.jarvinen@...ux.intel.com, platform-driver-x86@...r.kernel.org,
 linux-kernel@...r.kernel.org, Mark Pearson <mpearson-lenovo@...ebb.ca>
Subject: Re: [PATCH v1] platform/x86/amd: pmc: Add Lenovo Legion Go 2 to pmc
 quirk list

On 10/8/25 9:18 AM, Antheas Kapenekakis wrote:
> On Wed, 8 Oct 2025 at 16:06, Mario Limonciello <superm1@...nel.org> wrote:
>>
>> On 10/8/25 8:50 AM, Antheas Kapenekakis wrote:
>>> The Lenovo Legion Go 2 takes a long time to resume from suspend.
>>> This is due to it having an nvme resume handler that interferes
>>> with IOMMU mappings. It is a common issue with older Lenovo
>>> laptops. Adding it to that quirk list fixes this issue.
>>>
>>> Closes: https://gitlab.freedesktop.org/drm/amd/-/issues/4618
>>> Suggested-by: Mario Limonciello <mario.limonciello@....com>
>>> Signed-off-by: Antheas Kapenekakis <lkml@...heas.dev>
>>
>> This makes sense for BIOS in the field.
>> If this is fixed in the BIOS later I'd like to narrow the quirk at a
>> later time.
> 
> That would be ideal. Especially since the issue is known and fixed in
> Lenovo laptops from the last three years so it should be easy to fix.
> Currently, there are two BIOS versions that would need quirking,
> RRCN11WW, RRCN10WW.
> 
> What are the side effects from blocking the Nvme handler? Other than
> OPAL support handled by the built in BIOS, which is a semi-antifeature
> for a device like this.

The inability to use a storage password is the only side effect I'm 
aware of.  Given the form factor I tend to agree it's not "high 
priority" and thus this quirk makes sense.
> 
> I should note that there are other pressing issues with the device.
> Users report HDR brightness is not at correct levels compared to
> Windows and the brightness slider sometimes breaks after sleep.
> 
> HDR brightness might be a bug in Bazzite specifically, due to a
> blanket quirk we apply to disable the PQ curve on internal displays
> (essentially the panel that had the brightness bug on e.g. Zotac Zone
> also reports supporting PQ but it does not). I disabled it for the Go
> 2 but have not double checked it is disabled due to not having a
> device. Users said there was an improvement after disabling it though.
> 

Wrong audience for this issue.  I would raise this for discussion on 
dri-devel if it happens on a mainline kernel without extra distro 
specific quirks added.
> Antheas
> 
>> Reviewed-by: Mario Limonciello (AMD) <superm1@...nel.org>
>>
>>> ---
>>>    drivers/platform/x86/amd/pmc/pmc-quirks.c | 17 +++++++++++++++++
>>>    1 file changed, 17 insertions(+)
>>>
>>> diff --git a/drivers/platform/x86/amd/pmc/pmc-quirks.c b/drivers/platform/x86/amd/pmc/pmc-quirks.c
>>> index d63aaad7ef59..0fadcf5f288a 100644
>>> --- a/drivers/platform/x86/amd/pmc/pmc-quirks.c
>>> +++ b/drivers/platform/x86/amd/pmc/pmc-quirks.c
>>> @@ -204,6 +204,23 @@ static const struct dmi_system_id fwbug_list[] = {
>>>                        DMI_MATCH(DMI_PRODUCT_NAME, "82ND"),
>>>                }
>>>        },
>>> +     /* https://gitlab.freedesktop.org/drm/amd/-/issues/4618 */
>>> +     {
>>> +             .ident = "Lenovo Legion Go 2",
>>> +             .driver_data = &quirk_s2idle_bug,
>>> +             .matches = {
>>> +                     DMI_MATCH(DMI_BOARD_VENDOR, "LENOVO"),
>>> +                     DMI_MATCH(DMI_PRODUCT_NAME, "83N0"),
>>> +             }
>>> +     },
>>> +     {
>>> +             .ident = "Lenovo Legion Go 2",
>>> +             .driver_data = &quirk_s2idle_bug,
>>> +             .matches = {
>>> +                     DMI_MATCH(DMI_BOARD_VENDOR, "LENOVO"),
>>> +                     DMI_MATCH(DMI_PRODUCT_NAME, "83N1"),
>>> +             }
>>> +     },
>>>        /* https://gitlab.freedesktop.org/drm/amd/-/issues/2684 */
>>>        {
>>>                .ident = "HP Laptop 15s-eq2xxx",
>>>
>>> base-commit: a8cdf51cda30f7461a98af821e8a28c5cb5f8878
>>
>>
>