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 47F531386DA for ; Wed, 24 Dec 2025 12:00:18 +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=1766577619; cv=none; b=Hvq2YxTTwUzPqwdE4Lp9WP7IFBWfEXJOH5EMZY0j0968bk9CPIZ/HhBvejO2z/2nws6oaEcA/wnD53Y+LnOyYfZy/50nfVwBXJIvxkueKouaO7mUzhNn9Lv3kS3cgW4zxetU38ZuiTDQT+14eHN02jm9S0n/WP+sDs0RVkfuyT0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1766577619; c=relaxed/simple; bh=Gng2LHY/8KVfhOPkgvZqvZwljHCsj4cCR8aAF8gLRso=; h=From:To:Subject:Date:Message-ID:Content-Type:MIME-Version; b=Zi83iEJ0HvpVLxwU1sb/AOUHjN1lPkv8wTAeBXe2Irvk8EGpaTsXWsc/2hUrmydz6bYCeAJHv649pp1NuoAZy0r+nIloWWBfvG2mymLSKhhE02KbYM5ahRz7kQoYJnx/B40i3eDOib114mvfwj3TFKG0xU0Djezq8sO5Y8Mr+xI= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=RIOcvQVI; 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="RIOcvQVI" Received: by smtp.kernel.org (Postfix) with ESMTPS id CCE91C4CEFB for ; Wed, 24 Dec 2025 12:00:18 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1766577618; bh=Gng2LHY/8KVfhOPkgvZqvZwljHCsj4cCR8aAF8gLRso=; h=From:To:Subject:Date:From; b=RIOcvQVIfgi3F+B+wHZSuZjFgPLt8j1/ipSd/Vr+sCBioA2T3sZglGGCLFUtLFdYE rMYtCmpJu++qjz2yE9Zdm7F9Ey8LtsTFxQdcr+gYuzzF7JZFgqlljzx5SnCqp8uuXn WOfEV2aISne3u82LABs2mvMk1a1YswNHvNqp44XvtLgQc6yzFJYOlELdPcgeKc16JU peg/bvncBvMaP8SwcETu9cI4U+jYMoPUliFzpu3uhBaZwxf99z/MOMhlhJzWKG4Bkj LkJcdMjhR9J00yOrcoVMVlmvWbdfNHrwDEHq6Ogj5iuoHA+16SLizHiOo6WljuXqca 3+VNPkF03kN8w== Received: by aws-us-west-2-korg-bugzilla-1.web.codeaurora.org (Postfix, from userid 48) id BD5E4C3279F; Wed, 24 Dec 2025 12:00:18 +0000 (UTC) From: bugzilla-daemon@kernel.org To: linux-usb@vger.kernel.org Subject: [Bug 220904] New: [BUG] ucsi_acpi: USB 3.0 SuperSpeed not negotiated on USB-C hot-plug Date: Wed, 24 Dec 2025 12:00:18 +0000 X-Bugzilla-Reason: None X-Bugzilla-Type: new 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: bug_id short_desc product version cf_kernel_version rep_platform op_sys bug_status bug_severity priority component assigned_to reporter cf_regression attachments.created Message-ID: 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 Bug ID: 220904 Summary: [BUG] ucsi_acpi: USB 3.0 SuperSpeed not negotiated on USB-C hot-plug Product: Drivers Version: 2.5 Kernel Version: 6.18.2-zen2-1-zen Hardware: Intel OS: Linux Status: NEW Severity: normal Priority: P3 Component: USB Assignee: drivers_usb@kernel-bugs.kernel.org Reporter: thomas@jetzinger.com Regression: No Created attachment 309074 --> https://bugzilla.kernel.org/attachment.cgi?id=3D309074&action=3Dedit Kernel .config for 6.18.2-zen2-1-zen (Arch Linux zen kernel) [1.] One line summary of the problem: USB-C dock USB 3.0 devices fail to enumerate on hot-plug (only USB 2.0 work= s); works at boot and on Windows [2.] Full description of the problem/report: On ThinkPad X1 Carbon Gen 11 with ThinkPad USB-C Dock Gen2 (40AS), USB 3.0 devices (including ethernet adapter) do not enumerate when hot-plugging the dock. O= nly USB 2.0 devices (audio, HID) enumerate. The same dock works correctly when connecte= d at boot, and hot-plug works correctly on Windows 11, indicating this is a Linux driv= er issue. Detailed analysis: - At boot: Dock connects via Thunderbolt 4 controller (0000:00:0d.0), USB 3= .0 devices enumerate on Bus 2 (20Gbps SuperSpeed), ethernet (r8152) works - On hot-plug: Thunderbolt USB buses report "root hub lost power or was res= et" but dock falls back to internal xHCI controller (0000:00:14.0) Bus 3 at USB 2= .0 speeds only The typec subsystem shows the issue: - At boot: dock connects as port0-partner, port0 has USB connector bindings (usb2-port1, usb3-port1, usb4_port1) - On hot-plug: dock may connect as port1-partner, but port1 has NO USB connector bindings in ACPI (possible BIOS deficiency) - Even when hot-plugging to port0: SuperSpeed lanes are not negotiated, only USB 2.0 dmesg on hot-plug shows: usb usb1: root hub lost power or was reset usb usb2: root hub lost power or was reset usb 3-1: new high-speed USB device <-- Only USB 2.0 enumeration, no SuperSpeed The UCSI driver does not appear to trigger USB 3.0 SuperSpeed lane renegotiation on partner connect. No typec connector binding messages appear on hot-plug. Tested workarounds that do NOT fix the issue: - xHCI controller unbind/rebind (echo 0000:00:0d.0 > /sys/bus/pci/drivers/xhci_hcd/unbind) - UCSI driver reload (modprobe -r ucsi_acpi && modprobe ucsi_acpi) - Using either physical USB-C port Working workaround: Boot with dock already connected. [3.] Keywords (i.e., modules, networking, kernel): ucsi_acpi, typec_ucsi, typec, USB-C, Thunderbolt, hot-plug, SuperSpeed, xhci_hcd [4.] Kernel information [4.1.] Kernel version (from /proc/version): Linux version 6.18.2-zen2-1-zen (linux-zen@archlinux) (gcc (GCC) 15.2.1 20251112, GNU ld (GNU Binutils) 2.45.1) #1 ZEN SMP PREEMPT_DYNAMIC Thu, 18 = Dec 2025 18:00:58 +0000 [4.2.] Kernel .config file: [Attached separately as kernel-config.txt] [5.] Most recent kernel version which did not have the bug: Unknown [6.] Output of Oops.. message (if applicable) with symbolic information: No kernel oops. The only relevant messages are: usb usb1: root hub lost power or was reset usb usb2: root hub lost power or was reset And then USB 2.0-only enumeration on Bus 3 instead of SuperSpeed on Bus 2. [7.] A small shell script or example program which triggers the problem (if possible): # Reproduce steps: # 1. Boot system WITHOUT dock connected # 2. Log in to desktop # 3. Connect ThinkPad USB-C Dock Gen2 via USB-C cable # 4. Check USB topology: lsusb -t # Expected: Dock on Bus 2 with 20000M devices # Actual: Dock on Bus 3 with 480M devices only, Bus 2 empty # Diagnostic commands: ls /sys/class/typec/ # Shows port0-partner or port1-partner ls /sys/class/typec/port0/usb* # port0 has bindings ls /sys/class/typec/port1/usb* # port1 has NO bindings (ACPI issue?) ip link show | grep enp # Ethernet interface missing on hot-plug [8.] Environment: Hardware: Lenovo ThinkPad X1 Carbon Gen 11 (21HMCTO1WW) BIOS: N3XET63W (1.38) dated 2025-10-08 Dock: ThinkPad USB-C Dock Gen2 (40AS), firmware 5.05.00 OS: Arch Linux (rolling) Desktop: Hyprland (Wayland) USB Controllers: - 0000:00:0d.0: Intel Thunderbolt 4 (USB 3.2, buses 1+2) - 0000:00:14.0: Intel Alder Lake xHCI (USB 3.1, buses 3+4) ACPI USB-C controller: USBC000:00 with two ports (device:a2=3Dport0, device:a3=3Dport1) Related bug reports: - Red Hat Bugzilla #2248484: UCSI driver bug - Arch Linux Forum: https://bbs.archlinux.org/viewtopic.php?id=3D308325 --=20 You may reply to this email to add a comment. 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