Message-ID: 
 <CAGwozwEeZ5KKZWvhC1i-jS5Yike5gVeFK0yyu56L2-e5JvmsPQ@mail.gmail.com>
Date: Sat, 6 Dec 2025 00:03:12 +0100
From: Antheas Kapenekakis <lkml@...heas.dev>
To: Kelsios <K3lsios@...ton.me>
Cc: platform-driver-x86@...r.kernel.org, linux-input@...r.kernel.org,
	linux-kernel@...r.kernel.org, Jiri Kosina <jikos@...nel.org>,
	Benjamin Tissoires <bentiss@...nel.org>,
 Corentin Chary <corentin.chary@...il.com>,
	"Luke D . Jones" <luke@...nes.dev>, Hans de Goede <hansg@...nel.org>,
	Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>,
	Denis Benato <benato.denis96@...il.com>
Subject: Re: [PATCH v10 00/11] HID: asus: Fix ASUS ROG Laptop's Keyboard
 backlight handling

On Fri, 5 Dec 2025 at 23:13, Kelsios <K3lsios@...ton.me> wrote:
>
> Hello,
>
> I would like to report a regression affecting keyboard backlight brightness control on my ASUS ROG Zephyrus G16 (model GU605CW).
>
> Using kernel 6.17.9-arch1-1.1-g14 with the latest HID ASUS patchset v10, keyboard *color* control works correctly, but *brightness* control no longer responds at all. The issue is reproducible on every boot. This problem is not present when using patchset v8, where both color and brightness work as expected.
>
> Important detail: the issue occurs even **without** asusctl installed, so it must be within the kernel HID/WMI handling and is unrelated to userspace tools.
>
> Output of dmesg is available here [1], please let me know if any additional information is required.
>
> Thank you for your time and work on supporting these ASUS laptops.
>
> Best regards,
> Kelsios
>
> [1] https://pastebin.com/ZFC13Scf

[ 1.035986] asus 0003:0B05:19B6.0001: Asus failed to receive handshake ack: -32

Oh yeah, asus_kbd_init no longer works with spurious inits so it broke
devices marked with QUIRK_ROG_NKEY_LEGACY

There are three ways to approach this. One is to ignore the error...
second is to drop the quirk... third is to check for the usages for ID1, ID2...

I would tend towards dropping the ID2 init and ignoring the error for
ID1... Unless an EPIPE would cause the device to close

Antheas

> On 11/22/25 1:00 PM, Antheas Kapenekakis wrote:
> > This is a two part series which does the following:
> >   - Clean-up init sequence
> >   - Unify backlight handling to happen under asus-wmi so that all Aura
> >     devices have synced brightness controls and the backlight button works
> >     properly when it is on a USB laptop keyboard instead of one w/ WMI.
> >
> > For more context, see cover letter of V1. Since V5, I removed some patches
> > to make this easier to merge.
> >
> > ---
> > V9: https://lore.kernel.org/all/20251120094617.11672-1-lkml@antheas.dev/
> > V8: https://lore.kernel.org/all/20251101104712.8011-1-lkml@antheas.dev/
> > V7: https://lore.kernel.org/all/20251018101759.4089-1-lkml@antheas.dev/
> > V6: https://lore.kernel.org/all/20251013201535.6737-1-lkml@antheas.dev/
> > V5: https://lore.kernel.org/all/20250325184601.10990-1-lkml@antheas.dev/
> > V4: https://lore.kernel.org/lkml/20250324210151.6042-1-lkml@antheas.dev/
> > V3: https://lore.kernel.org/lkml/20250322102804.418000-1-lkml@antheas.dev/
> > V2: https://lore.kernel.org/all/20250320220924.5023-1-lkml@antheas.dev/
> > V1: https://lore.kernel.org/all/20250319191320.10092-1-lkml@antheas.dev/
> >
> > Changes since V9:
> >   - No functional changes
> >   - Rebase to review-ilpo-next
> >   - Fix armoury series conflict by removing the file asus-wmi-leds-ids on
> >     "remove unused keyboard backlight quirk" + imports
> >     Dismiss Luke's review as this patch diverged
> >   - Reword paragraph in "Add support for multiple kbd led handlers" to be
> >     more verbose
> >   - Use kfree in fortify patch
> >   - Fix minor style quirks from --nonstict checkpatch run
> >
> > Changes since V8:
> >   - No functional changes
> >   - Move legacy init patch to second, modify first patch so that their
> >     diff is minimized
> >   - Split "prevent binding to all HID devices on ROG" into two patches:
> >     - moving backlight initialization into probe
> >     - early exit to skip ->init check and rename
> >     - Remove skipping vendor fixups for non-vendor devices. It is not possible
> >       to read usages before the report fixups are applied, so it did not work
> >   - In that patch, reword a comment to be single line and make is_vendor a bool
> >   - Dismiss Luke's tags from "Add support for multiple kbd led handlers" as it
> >     has drifted too far since he reviewed/tested it.
> >
> > Changes since V7:
> >   - Readd legacy init quirk for Dennis
> >   - Remove HID_QUIRK_INPUT_PER_APP as a courtesy to asusctl
> >   - Fix warning due to enum_backlight receiving negative values
> >
> > Changes since V6:
> >   - Split initialization refactor into three patches, update commit text
> >     to be clearer in what it does
> >   - Replace spinlock accesses with guard and scoped guard in all patches
> >   - Add missing includes mentioned by Ilpo
> >   - Reflow, tweak comment in prevent binding to all HID devices on ROG
> >   - Replace asus_ref.asus with local reference in all patches
> >   - Add missing kernel doc comments
> >   - Other minor nits from Ilpo
> >   - User reported warning due to scheduling work while holding a spinlock.
> >     Restructure patch for multiple handlers to limit when spinlock is held to
> >     variable access only. In parallel, setup a workqueue to handle registration
> >     of led device and setting brightness. This is required as registering the
> >     led device triggers kbd_led_get which needs to hold the spinlock to
> >     protect the led_wk value. The workqueue is also required for the hid
> >     event passthrough to avoid scheduling work while holding the spinlock.
> >     Apply the workqueue to wmi brightness buttons as well, as that was
> >     omitted before this series and WMI access was performed.
> >   - On "HID: asus: prevent binding to all HID devices on ROG", rename
> >     quirk HANDLE_GENERIC to SKIP_REPORT_FIXUP and only skip report fixup.
> >     This allows other quirks to apply (applies quirk that fixes keyboard
> >     being named as a pointer device).
> >
> > Changes since V5:
> >   - It's been a long time
> >   - Remove addition of RGB as that had some comments I need to work on
> >   - Remove folio patch (already merged)
> >   - Remove legacy fix patch 11 from V4. There is a small chance that
> >     without this patch, some old NKEY keyboards might not respond to
> >     RGB commands according to Luke, but the kernel driver does not do
> >     RGB currently. The 0x5d init is done by Armoury crate software in
> >     Windows. If an issue is found, we can re-add it or just remove patches
> >     1/2 before merging. However, init could use the cleanup.
> >
> > Changes since V4:
> >   - Fix KConfig (reported by kernel robot)
> >   - Fix Ilpo's nits, if I missed anything lmk
> >
> > Changes since V3:
> >   - Add initializer for 0x5d for old NKEY keyboards until it is verified
> >     that it is not needed for their media keys to function.
> >   - Cover init in asus-wmi with spinlock as per Hans
> >   - If asus-wmi registers WMI handler with brightness, init the brightness
> >     in USB Asus keyboards, per Hans.
> >   - Change hid handler name to asus-UNIQ:rgb:peripheral to match led class
> >   - Fix oops when unregistering asus-wmi by moving unregister outside of
> >     the spin lock (but after the asus reference is set to null)
> >
> > Changes since V2:
> >   - Check lazy init succeds in asus-wmi before setting register variable
> >   - make explicit check in asus_hid_register_listener for listener existing
> >     to avoid re-init
> >   - rename asus_brt to asus_hid in most places and harmonize everything
> >   - switch to a spinlock instead of a mutex to avoid kernel ooops
> >   - fixup hid device quirks to avoid multiple RGB devices while still exposing
> >     all input vendor devices. This includes moving rgb init to probe
> >     instead of the input_configured callbacks.
> >   - Remove fan key (during retest it appears to be 0xae that is already
> >     supported by hid-asus)
> >   - Never unregister asus::kbd_backlight while asus-wmi is active, as that
> >   - removes fds from userspace and breaks backlight functionality. All
> >   - current mainline drivers do not support backlight hotplugging, so most
> >     userspace software (e.g., KDE, UPower) is built with that assumption.
> >     For the Ally, since it disconnects its controller during sleep, this
> >     caused the backlight slider to not work in KDE.
> >
> > Changes since V1:
> >   - Add basic RGB support on hid-asus, (Z13/Ally) tested in KDE/Z13
> >   - Fix ifdef else having an invalid signature (reported by kernel robot)
> >   - Restore input arguments to init and keyboard function so they can
> >     be re-used for RGB controls.
> >   - Remove Z13 delay (it did not work to fix the touchpad) and replace it
> >     with a HID_GROUP_GENERIC quirk to allow hid-multitouch to load. Squash
> >     keyboard rename into it.
> >   - Unregister brightness listener before removing work queue to avoid
> >     a race condition causing corruption
> >   - Remove spurious mutex unlock in asus_brt_event
> >   - Place mutex lock in kbd_led_set after LED_UNREGISTERING check to avoid
> >     relocking the mutex and causing a deadlock when unregistering leds
> >   - Add extra check during unregistering to avoid calling unregister when
> >     no led device is registered.
> >   - Temporarily HID_QUIRK_INPUT_PER_APP from the ROG endpoint as it causes
> >     the driver to create 4 RGB handlers per device. I also suspect some
> >     extra events sneak through (KDE had the @@@@@@).
> >
> > Antheas Kapenekakis (11):
> >   HID: asus: simplify RGB init sequence
> >   HID: asus: initialize additional endpoints only for legacy devices
> >   HID: asus: use same report_id in response
> >   HID: asus: fortify keyboard handshake
> >   HID: asus: move vendor initialization to probe
> >   HID: asus: early return for ROG devices
> >   platform/x86: asus-wmi: Add support for multiple kbd led handlers
> >   HID: asus: listen to the asus-wmi brightness device instead of
> >     creating one
> >   platform/x86: asus-wmi: remove unused keyboard backlight quirk
> >   platform/x86: asus-wmi: add keyboard brightness event handler
> >   HID: asus: add support for the asus-wmi brightness handler
> >
> >  drivers/hid/hid-asus.c                        | 205 ++++++++--------
> >  drivers/platform/x86/asus-wmi.c               | 223 +++++++++++++++---
> >  .../platform_data/x86/asus-wmi-leds-ids.h     |  50 ----
> >  include/linux/platform_data/x86/asus-wmi.h    |  28 +++
> >  4 files changed, 322 insertions(+), 184 deletions(-)
> >  delete mode 100644 include/linux/platform_data/x86/asus-wmi-leds-ids.h
> >
> >
> > base-commit: 2643187ccb8628144246ee9d44da5e3ac428f9c3
>
>
>

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