From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 1E20E2F28FF for ; Tue, 30 Dec 2025 18:42:43 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1767120164; cv=none; b=pIT4TXp2WeqHxSSWOc5TFVpvSdCzskXwQ20VzxLE16lrKvBcZ/5xRtv3+XBfVL2d9UTCHr8C5hJR0N47VYQKIodRCvBQr7/QalWr/Gyy3v1Bd8rUVgr97yEqNPpejVQl/Z+xmd8GVRfVoey438k5i7qPcptGO9oOYJMlji92eOk= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1767120164; c=relaxed/simple; bh=4qNwd6ZKnb9olyXFWULC6A7T62ob4hnUOx1xXGNILYg=; h=From:To:Subject:Date:Message-ID:In-Reply-To:References: Content-Type:MIME-Version; b=Tf9KZEHu1Jh/gBPHc0/OzqaWMBxngyZw8IQj+69kPL68x0LM0IlCHyVxNdhjgcSMifmlj54dHYt9epdIaIdUQmN0+7eMYDOSsW3CFmbXARouVVLTZcExRx5MYPDhRgRTbEwAJkB36JhpfGY+YGaLh34bypAZ/AFKtpTdlsKX1UQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=CSugB5x4; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="CSugB5x4" Received: by smtp.kernel.org (Postfix) with ESMTPS id 9F0D6C16AAE for ; Tue, 30 Dec 2025 18:42:43 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1767120163; bh=4qNwd6ZKnb9olyXFWULC6A7T62ob4hnUOx1xXGNILYg=; h=From:To:Subject:Date:In-Reply-To:References:From; b=CSugB5x45Br+z3W75h9P2WNooMKRpUoStuK3hXdXSO4h1D3+JNBfZy0Y5GzctdPzF 1YeOLe42bSJLSJStAabqEUOk0urhIWbnhefiYrwa8jrAk18l1ZIHONNPNd1iVKP/k2 lE/9C/BKS+hPkDM7tILhaOKvWUDJRM6Fclf+Jp8fHdpZPls0bGqr9sIKsto7ZL+CpK ksC51u4jq30JfFk/IpdDWaed89PBOdYShnN+EubJfG+GZRpW1fVXG8ZxZq3fgCz5Rx Qu1mpo/41Jn3RhXVEzuxI4W8au+1Jz+CdecNoYa7zk78ZRdx/MQdck2XMpxhIbDzqH tN3jXOpL0tsRQ== Received: by aws-us-west-2-korg-bugzilla-1.web.codeaurora.org (Postfix, from userid 48) id 8F056C41612; Tue, 30 Dec 2025 18:42:43 +0000 (UTC) From: bugzilla-daemon@kernel.org To: linux-usb@vger.kernel.org Subject: [Bug 220904] [BUG] ucsi_acpi: USB 3.0 SuperSpeed not negotiated on USB-C hot-plug Date: Tue, 30 Dec 2025 18:42:43 +0000 X-Bugzilla-Reason: None X-Bugzilla-Type: changed X-Bugzilla-Watch-Reason: AssignedTo drivers_usb@kernel-bugs.kernel.org X-Bugzilla-Product: Drivers X-Bugzilla-Component: USB X-Bugzilla-Version: 2.5 X-Bugzilla-Keywords: X-Bugzilla-Severity: normal X-Bugzilla-Who: thomas@jetzinger.com X-Bugzilla-Status: NEW X-Bugzilla-Resolution: X-Bugzilla-Priority: P3 X-Bugzilla-Assigned-To: drivers_usb@kernel-bugs.kernel.org X-Bugzilla-Flags: X-Bugzilla-Changed-Fields: attachments.created Message-ID: In-Reply-To: References: Content-Type: text/plain; charset="UTF-8" Content-Transfer-Encoding: quoted-printable X-Bugzilla-URL: https://bugzilla.kernel.org/ Auto-Submitted: auto-generated Precedence: bulk X-Mailing-List: linux-usb@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 https://bugzilla.kernel.org/show_bug.cgi?id=3D220904 --- Comment #2 from Thomas Jetzinger (thomas@jetzinger.com) --- Created attachment 309097 --> https://bugzilla.kernel.org/attachment.cgi?id=3D309097&action=3Dedit Disabling UCSI does NOT resolve the issue Hi Heikki, Here are the logs from two test scenarios. Both tests confirm the issue persists regardless of UCSI driver status. ## System Info - ThinkPad X1 Carbon Gen 11 (21HMCTO1WW) - BIOS: N3XET63W (1.38) - Kernel: 6.18.2-zen2-1-zen (custom build, also tested on stock 6.12) - Dock: ThinkPad USB-C Dock Gen2 (40AS) ## Test 1: UCSI Enabled (Normal Configuration) **Boot with dock connected:** USB 3.0 works - Ethernet (17ef:a387) on Bus 002 @ 5000M - USB3.1 Hub (17ef:a391) on Bus 002 @ 10000M **After disconnect + reconnect:** USB 3.0 FAILS - Only USB 2.0 devices enumerate (480M on Bus 003) - Bus 002 (20Gbps SuperSpeed) is completely empty - Ethernet and USB 3.0 hub missing Key log pattern: usb usb1: root hub lost power or was reset usb usb2: root hub lost power or was reset usb 3-3: new high-speed USB device number 14 using xhci_hcd =E2=86=90 USB= 2.0 only ## Test 2: UCSI Disabled (blacklist ucsi_acpi) **Boot with dock connected:** USB 3.0 works (same as Test 1) **After disconnect + reconnect:** USB 3.0 STILL FAILS - Identical failure pattern to Test 1 - Same "root hub lost power or was reset" messages - Only high-speed (USB 2.0) enumeration ## Conclusion Disabling UCSI does NOT resolve the issue. The problem appears to be in the USB-C/Thunderbolt physical layer negotiation, not the UCSI driver. The repe= ated "root hub lost power or was reset" messages on usb1/usb2 (Thunderbolt/USB4 buses) during hot-plug suggest the xHCI controller is being reset but faili= ng to re-enumerate SuperSpeed devices. Full logs attached: - bug-220904-test1-ucsi-enabled.txt (Test 1 with UCSI) - bug-220904-test2-ucsi-disabled.txt (Test 2 without UCSI) --=20 You may reply to this email to add a comment. You are receiving this mail because: You are watching the assignee of the bug.=