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 9349143550C for ; Mon, 10 Aug 2026 18:10:07 +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=1786385407; cv=none; b=H1SRWizFF6xvRTyXIDQ8SHkG9j+tgvZ6sVdrfpOuRMuDwv6aRa4/93S4oPjyVdaqOJfAzpAcQevt/PMhy/0aDUpfoWhyPGhCcLALVf4ZdVwzmAiD4b/t5770Dq2+KJWvSM+tBPMn5bjiD+8jKFF1t3dIAJB0XPYjxISb8sTWSv8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1786385407; c=relaxed/simple; bh=6Q8mhpEOGcbZRtbtTig4lu8wB4ucqUohaL3wYMcAGjc=; h=From:To:Subject:Date:Message-ID:In-Reply-To:References: Content-Type:MIME-Version; b=C36H+4yfSHRN6CyfyD/tbhL+0rnuLVPNgSbm6zle+F7ujZ1XoXoaNjkEqQ/j46Ya5g99E+EKPT8ehCNsYgB47pNudXPbgVFgWXD+AIxnQHMhDXOuZwgH7ygy3W+iuzXJxNesg61Lu+uRYg+BdoEYc9X62CmG9mrar1Tgi33W4hw= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=ArPRr0gv; 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="ArPRr0gv" Received: by smtp.kernel.org (Postfix) with ESMTPS id 2368AC19425 for ; Mon, 10 Aug 2026 18:10:07 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1786385407; bh=6Q8mhpEOGcbZRtbtTig4lu8wB4ucqUohaL3wYMcAGjc=; h=From:To:Subject:Date:In-Reply-To:References:From; b=ArPRr0gvFWwM40hMpXckeDDIzvmcJh5362a+eo/71+4yh0sWHZz3SlyDQVEDGXPGW zM4NDGO5m7YTY88xE3dYn5RoQhDRWVrLEAWUEZ8d3lrses3GM79HIxn8t5cKdQect/ puD/ZmNzBCwQNNiAIiNtRhMv4nUK3WJhTQpHaTVqrlNPNoJ8ijpTdImmJhUi+MQ8/+ 7tfjn+AmFImLWVYnwUGkaGMxPj5kFVYwucjvfp8IeOmNs54RhsR3XEifQzO6Ckuvjs YTsRsCkXR+CoPtCmm0+e20vhHPRP+FWKzDDzrNf5eQXBTAUBboDk+QsMBam4q/nxfh 9aNO9MzR6k5lw== Received: by aws-us-west-2-korg-bugzilla-1.web.codeaurora.org (Postfix, from userid 48) id 10AC1C3279F; Mon, 10 Aug 2026 18:10:07 +0000 (UTC) From: bugzilla-daemon@kernel.org To: linux-usb@vger.kernel.org Subject: [Bug 221776] HP OmniBook X Flip - Broken UCSI firmware / Slow charging Date: Mon, 10 Aug 2026 18:10:06 +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: daviddelsol1998@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: 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=3D221776 --- Comment #3 from David Del Sol (daviddelsol1998@gmail.com) --- Updating this report with the verified root cause, found since the original filing. The slow-charging issue is NOT UCSI firmware corruption. Root cause: the EC only enables normal charging when the OS claims _OSI("Windows 2022"). Verif= ied: - DSDT/SSDT (via strings on /sys/firmware/acpi/tables/*) contain OSI checks only up to "Windows 2022"; the kernel's default claimed OSI strings stop be= fore that. - Adding acpi_osi=3D! acpi_osi=3D"Windows 2022" to the kernel cmdline resto= res 31-33 W charging immediately, reproducibly, on kernels 7.1.6 and 6.18.42-LT= S, across multiple charge cycles (currently 27.8 W, battery 79%). - This works with ucsi_acpi loaded -- the driver does not need to be blacklisted, so the proposed ucsi_acpi.c DMI quirk in Comment 1 is unnecess= ary and is withdrawn. Per Greg's note: the correct upstream fix is a DMI-scoped OSI quirk in drivers/acpi/osi.c (linux-acpi mailing list). Filed as a new report with fu= ll evidence and EC RAM attachments: https://bugzilla.kernel.org/show_bug.cgi?id=3D221866 Separate, intermittent issue (still open, tracked in 221866): on ~1 in 4 plug/unplug events the 65 W charger's PD contract occasionally sticks at 5 = V / 3 A (~0.2 W to battery) until reboot. UCSI driver reload and suspend/resume= did not recover it. Not reproduced in later cycles; appears to be a PD renegotiation race. Closing this bug as resolved-by-workaround: acpi_osi=3D! acpi_osi=3D"Window= s 2022" on the kernel command line. --=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.=