acer-wmi: Acer Predator PH315-54 Turbo button handled by WMI but model lacks DMI quirk

Hello,

I would like to report a possible missing DMI quirk in
drivers/platform/x86/acer-wmi.c for the Acer Predator Helios 300
PH315-54.

Hardware:

Vendor:  Acer
Product: Predator PH315-54
Board:   QX60_TLS
BIOS:    V1.15 (2023-06-29)
CPU:     Intel Core i7-11800H
GPU:     NVIDIA GeForce RTX 3070 Laptop GPU

Tested system:

Ubuntu 26.04 LTS
kernel 7.0.0-29-generic
acer_wmi built as module

The physical Turbo button above the keyboard does not activate Turbo
mode and its LED remains off.

acer_wmi loads normally:

acer_wmi: Acer Laptop ACPI-WMI Extras
acer_wmi: Function bitmap for Communication Button: 0x801

The system exposes an Acer WMI hotkeys input device and the Acer
gaming WMI interfaces are present.

The relevant module parameters are:

force_series=0
force_caps=-1
ec_raw_mode=N
cycle_gaming_thermal_profile=Y
predator_v4=N

No platform_profile interface is exposed.

I traced the Turbo button using a kprobe on the actual compiled
acer_toggle_turbo symbol:

acer_toggle_turbo.isra.0 [acer_wmi]

Every physical press of the Turbo button reaches this function. In one
test, 11 button presses produced exactly 11 kprobe hits with zero
misses:

acer_turbo    11    0

A kretprobe also showed that acer_toggle_turbo.isra.0 returned 0 on
every tested press.

Therefore the hardware button, firmware WMI notification and acer_wmi
event handling path appear to work correctly.

I then inspected the acer-wmi.ko shipped with the running Ubuntu
kernel. It contains:

Acer Predator PH315-53
Predator PH315-53
quirk_acer_predator_ph315_53

but there is no PH315-54 DMI entry.

The PH315-53 quirk appears particularly relevant because it enables:

.turbo = 1
.cpu_fans = 1
.gpu_fans = 1

The PH315-54 is the following generation of the same Predator Helios
300 family and has the physical Predator Turbo button.

A possible candidate would therefore be to add a PH315-54 DMI match
using the existing quirk_acer_predator_ph315_53, e.g. conceptually:

{
    .callback = dmi_matched,
    .ident = "Acer Predator PH315-54",
    .matches = {
        DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
        DMI_MATCH(DMI_PRODUCT_NAME, "Predator PH315-54"),
    },
    .driver_data = &quirk_acer_predator_ph315_53,
},

I have not loaded or functionally tested this proposed quirk, because
I preferred not to maintain an out-of-tree kernel module merely for
the Turbo button. I am therefore reporting this as a possible missing
hardware quirk rather than claiming the above patch is proven correct.

I can provide additional WMI traces, DMI information, ACPI tables or
test a maintainer-provided patch if useful.

Regards,
Stefano Dall'Olio


-- 
_
Stefano Dall'Olio
IT Manager

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