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[83.28.44.19]) by smtp.gmail.com with ESMTPSA id 2adb3069b0e04-5ad5c26ede8sm1179232e87.29.2026.06.21.11.28.51 (version=TLS1_2 cipher=AES128-SHA bits=128/128); Sun, 21 Jun 2026 11:28:51 -0700 (PDT) Date: Sun, 21 Jun 2026 20:28:45 +0200 From: Michal Pecio To: Ingo Haenlein Cc: linux-usb@vger.kernel.org Subject: Re: [BUG] xHCI: AMD Strix Halo [1022:158b] isochronous full-duplex USB audio instability (frame active: -18) Message-ID: <20260621202845.77536cd3.michal.pecio@gmail.com> In-Reply-To: <48aadb68-b4d1-4dd6-82ca-76d0846b4ae1@gmx.de> References: <48aadb68-b4d1-4dd6-82ca-76d0846b4ae1@gmx.de> Precedence: bulk X-Mailing-List: linux-usb@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable On Sun, 21 Jun 2026 18:30:23 +0200, Ingo Haenlein wrote: > Hello, >=20 > I am reporting a reproducible isochronous full-duplex USB audio=20 > instability on an AMD Strix Halo system (HP ZBook Ultra G1a) under=20 > Linux. A detailed bug report including kernel logs, USB descriptors, and= =20 > endpoint data has been filed at: >=20 > https://bugzilla.kernel.org/show_bug.cgi?id=3D221650 >=20 > This mail summarizes the findings and forwards the issue to linux-usb as= =20 > the problem appears to be in the xHCI host controller path rather than=20 > in snd-usb-audio. >=20 >=20 > Affected system > --------------- >=20 > Machine:=C2=A0 =C2=A0 HP ZBook Ultra G1a (AMD Strix Halo / Ryzen AI Max) > Kernel: > 7.0.12-zen1-1-zen (linux-zen, Arch Linux) > 7.0.12.arch1-1 (linux, Arch Linux, vanilla kernel.org sources) > Controller: c5:00.4 AMD Strix Halo USB 3.1 xHCI [1022:158b] > Driver:=C2=A0 =C2=A0 =C2=A0xhci_hcd, CONFIG_USB_XHCI_PCI=3Dy >=20 >=20 > Symptom > ------- >=20 > During continuous full-duplex USB audio operation, round-trip latency jum= ps > discretely. Kernel logs show: >=20 > =C2=A0 frame active: -18 > =C2=A0 retire_capture_urb Not sure what you mean and I can't find these strings in USB audio drievr, but -18 is -EXDEV i.e. Missed Service Error in xHCI. Will you see messages about it after enabling dynamic debug? echo 'func handle_tx_event +p' >/proc/dynamic_debug/control > The Audient iD44 MK2 works without this issue on a Lenovo ThinkPad X1 > Gen 2 using the same Linux audio workflow. This confirms a > host-controller-specific problem. And since it's unique to a recent AMD system, maybe this? https://lore.kernel.org/linux-usb/18b4e4f7089aa4f1.da8dbe994ae3bb77.445e21b= 98b0b205b@GordonMsi/ Regards, Michal