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Fri, 23 Oct 2026 21:11:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1792789885; bh=tUd+vyC044P9qhroP6uKBDcCcAPP7zOiSOh7fyQxpRw=; h=From:To:Subject:Date:From; b=Edpl8CcBjOWAYlKmCnNnIZy/tOoDf0qfJMLJLuiyDYBlHATrXzZMAbUA9wZb1nX6B omuFBZ3iNOCzPETNqgAFnVCYxCyMYx/YSzz9OB2rtREd0Rf5PO/S3XQeocBV0jY8lz 8ZYD/c56AOGjiLZTFJbH7gQprDF6F8LEDxS2zdqQ/zBt85ZpHfx3Klx47MKE9Q+4zO gOLDbflMdnA1ecUQv0q/fWJl6aLN+gqnMxcpiZpgcGhAD1NrGYM0eoEvgsncv7O80D iT/vyZ26Nsuux81lMJSfgx4D+whQbSJ9Wrg5iUHbybFushicRO3EplbQEYSw1Dlt6y y1629VDCeVJrQ== Received: by aws-us-west-2-korg-bugzilla-1.web.codeaurora.org (Postfix, from userid 48) id 19B14C41612; Fri, 23 Oct 2026 21:11:25 +0000 (UTC) From: bugzilla-daemon@kernel.org To: linux-usb@vger.kernel.org Subject: [Bug 222188] New: ASUS ROG Flow Z13 GZ302EAC (Strix Halo): no DisplayPort Alt Mode on USB4 Type-C ports, partner altmodes never registered by UCSI Date: Fri, 23 Oct 2026 21:11:24 +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: dimitri.creus@gmail.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 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 X-Mailing-List: linux-usb@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 https://bugzilla.kernel.org/show_bug.cgi?id=3D222188 Bug ID: 222188 Summary: ASUS ROG Flow Z13 GZ302EAC (Strix Halo): no DisplayPort Alt Mode on USB4 Type-C ports, partner altmodes never registered by UCSI Product: Drivers Version: 2.5 Hardware: AMD OS: Linux Status: NEW Severity: normal Priority: P3 Component: USB Assignee: drivers_usb@kernel-bugs.kernel.org Reporter: dimitri.creus@gmail.com Regression: No Created attachment 311261 --> https://bugzilla.kernel.org/attachment.cgi?id=3D311261&action=3Dedit rapport-usbc.txt Hardware: ASUS ROG Flow Z13 GZ302EAC (AMD Ryzen AI Max+ 395, Radeon 8060S "Strix Halo"), BIOS GZ302EAC.304. Both Type-C ports are USB4 with DisplayPort and Power Delivery according to ASUS specifications. Problem: A passive USB-C -> HDMI cable (DP Alt Mode) connected to a TV gives no pict= ure. All card1-DP-* DRM connectors stay "disconnected". The native HDMI port of the same laptop wor= ks with the same TV. The same cable and TV work with another DP Alt Mode source (Meta Quest 3), = so cable and display are fine. Observations (Fedora 44, kernel 7.2.11-200.fc44): - typec, typec_ucsi, ucsi_acpi are loaded; typec_displayport was not auto-loaded. - The cable is enumerated as a port partner (portN-partner appears on plug = and disappears on unplug), supports_usb_power_delivery=3Dyes, power_role source, data_role host. - No partner altmode is ever registered: /sys/bus/typec/devices/ stays empt= y. - Loading typec_displayport manually and re-plugging changes nothing. - Same result on both Type-C ports, both plug orientations, cold boot with = the cable connected, and after an ASUS EC reset. - Nothing typec/ucsi related is logged by the kernel on plug or unplug. Also reproduced with an Ubuntu 26.10 live USB (kernel 7.3): same behaviour,= no picture. Expected: DisplayPort Alt Mode entered, a DP connector becomes "connected". Attached: rapport-usbc.txt (typec sysfs attributes, port and partner altmod= es, partner identity, DRM connector status, lspci, kernel log filtered on ucsi/typec/thunderbolt/usb4). I can test patches or provide more debug output (ucsi tracing, debugfs) if needed. --=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.=