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Mon, 05 Oct 2026 22:04:02 -0700 (PDT) Received: from archlinux ([2405:201:1b:20ef:de2d:6e5b:74df:ad41]) by smtp.gmail.com with ESMTPSA id a92af1059eb24-15d7a824d52sm3460427c88.1.2026.10.05.22.04.01 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 05 Oct 2026 22:04:02 -0700 (PDT) Date: Tue, 6 Oct 2026 10:33:59 +0530 From: Krishna Chomal To: Piyush Kumar Cc: platform-driver-x86@vger.kernel.org Subject: Re: [BUG] hp-wmi: Mute and mic-mute LEDs not supported on HP Laptop 15-fc0xxx (board 8DC9) Message-ID: References: Precedence: bulk X-Mailing-List: platform-driver-x86@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8; format=flowed Content-Disposition: inline In-Reply-To: On Mon, Oct 05, 2026 at 06:01:15AM +0000, Piyush Kumar wrote: >Hi, > >I am writing to report an issue where the speaker mute LED (F5) and >mic-mute LED (F8) are non-functional under Linux on the HP Laptop >15-fc0xxx (Motherboard DMI: 8DC9), although audio muting itself works >fine and the LEDs function properly under Windows. > >This issue is tracked on Kernel Bugzilla under Bug 222044. > >Hardware Environment: >- Laptop: HP Laptop 15-fc0xxx >- Motherboard DMI: 8DC9 >- Subsystem ID: 103c:8dc9 >- BIOS Version: F.25 >- Audio Codec: Realtek ALC236 (103c:8dc9) >- Kernel: 7.2.6-zen2-1-zen x86_64 > >Diagnostic Summary: >1. ALC236 Codec Control Ruled Out: > Direct hda-verb coefficient writes (node 0x20, verbs 0x500/0x400 on >indices 0x0b, 0x19, 0x34) return 0x0 with no effect on the LEDs, >indicating the LEDs are electrically decoupled from the Realtek codec. >2. The LEDs appear to be handled via ACPI / EC under hp-wmi, but lack >the necessary quirk/table definitions for board ID 8DC9. Hi Piyush Kumar, As stated earlier, hp-wmi does NOT handle LEDs and there is no necessary quick/table definition for any board in this driver. Please post this hda-verb diagnostic summary on your Bugzilla bug 222044 where Zhang Heng has asked, he may be able to guide you best. >Diagnostic logs and WMI/DMI details are available on the ticket. >Please let me know if any further dumps or testing of patches are >needed. > >Best regards, >Piyush