platform/x86: hp-wmi: Add GPU MUX switch support

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Add support for querying and switching the graphics MUX mode on HP
systems via WMI. This introduces the 'gpu_mux_mode' sysfs attribute
under the hp-wmi platform device, allowing userspace tools to check
and safely switch between available graphics modes (e.g., UMA, Hybrid,
Discrete).

The hardware capabilities mask is primarily read using the modern
128-byte System Design Data query. However, to ensure backward
compatibility with older models, a fallback mechanism is implemented.
By mirroring the behavior of the Windows Omen Gaming Hub software, if
the modern query fails but the MUX WMI endpoint (0x52) responds
successfully to a read request, the driver defaults to a standard
Hybrid + Discrete support mask (0x06).

Signed-off-by: Kürşat Abaylı <hello@kursatabayli.dev>
Link: https://patch.msgid.link/20260723172734.18361-1-hello@kursatabayli.dev
[ij: add kstrtox.h]
Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>

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Kürşat Abaylı 2026-07-23 20:27:34 +03:00 • committed by Ilpo Järvinen

parent caf8342512

commit 59f586eb93

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drivers/platform/x86/hp/hp-wmi.c

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