Message-ID: 
 <CAGwozwHmTUb3Bcbn9Zc44sqe7DHtnnk0chvhjN7jJNrmePr8fw@mail.gmail.com>
Date: Thu, 16 Oct 2025 14:51:42 +0200
From: Antheas Kapenekakis <lkml@...heas.dev>
To: Denis Benato <benato.denis96@...il.com>
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 <hdegoede@...hat.com>,
	Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
Subject: Re: [PATCH v6 0/7] HID: asus: Fix ASUS ROG Laptop's Keyboard
 backlight handling

On Thu, 16 Oct 2025 at 14:46, Denis Benato <benato.denis96@...il.com> wrote:
>
>
> On 10/16/25 14:28, Antheas Kapenekakis wrote:
> > On Thu, 16 Oct 2025 at 14:19, Denis Benato <benato.denis96@...il.com> wrote:
> >>
> >> On 10/16/25 14:14, Antheas Kapenekakis wrote:
> >>> On Thu, 16 Oct 2025 at 13:57, Denis Benato <benato.denis96@...il.com> wrote:
> >>>> On 10/13/25 22:15, 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.
> >>>>>
> >>>>> All comments with these patches had been addressed since V4.
> >>>> I have loaded this patchset for users of asus-linux project to try out.
> >>>>
> >>>> One of them opened a bug report about a kernel bug that happens
> >>>> consistently when closing the lid of his laptop [1].
> >>>>
> >>>> He also sent another piece of kernel log, but didn't specify anything more
> >>>> about this [2].
> >>>>
> >>>> [1] https://pastebin.com/akZx1w10
> >>>> [2] https://pastebin.com/sKdczPgf
> >>> Can you provide a link to the bug report? [2] seems unrelated.
> >> The log in [2] was posted without additional context in the same
> >> discord message as [1].
> > Link me the kernel sources. Is it linux-g14 in the AUR?
> Someone has replicated it on the AUR but it's just an out-of-sync replica.
>
> The true source code is here:
> https://gitlab.com/asus-linux/linux-g14 branch 6.17

Ok, lets wait for the user to replicate on a stock kernel

> >> I think I will tell the user to open a proper bug report because
> >> I do agree on the fact that it's looking unrelated.
> >>> As for [1], it looks like a trace that stems from a sysfs write to
> >>> brightness stemming from userspace that follows the same chain it
> >>> would on a stock kernel and times out. Is it present on a stock
> >>> kernel?
> >> I have asked more details to the user. The user is not online ATM
> >> so I will get to you with more details when I can.
> >>> Ilpo should know more about this, could the spinlock be interfering?
> >>> My testing on devices that have WMI led controls is a bit limited
> >>> unfortunately. However, most of our asus users have been happy with
> >>> this series for around half a year now.
> >> Unless they have looked to kernel logs they won't be able to tell
> >> since apparently there are no visible consequences.
> >>> Antheas
> >>>
> >>>>> ---
> >>>>> 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 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 (7):
> >>>>>   HID: asus: refactor init sequence per spec
> >>>>>   HID: asus: prevent binding to all HID devices on ROG
> >>>>>   platform/x86: asus-wmi: Add support for multiple kbd RGB 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                     | 235 +++++++++++----------
> >>>>>  drivers/platform/x86/asus-wmi.c            | 157 ++++++++++++--
> >>>>>  include/linux/platform_data/x86/asus-wmi.h |  69 +++---
> >>>>>  3 files changed, 291 insertions(+), 170 deletions(-)
> >>>>>
> >>>>>
> >>>>> base-commit: 3a8660878839faadb4f1a6dd72c3179c1df56787
>

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