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Wed, 22 Jul 2026 01:29:25 -0400 (EDT) Date: Wed, 22 Jul 2026 07:29:16 +0200 From: Greg KH To: bugzilla-daemon@kernel.org Cc: linux-usb@vger.kernel.org Subject: Re: [Bug 221776] HP OmniBook X Flip - Broken UCSI firmware / Slow charging Message-ID: <2026072254-unveiling-trunks-5cee@gregkh> References: 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=us-ascii Content-Disposition: inline In-Reply-To: On Tue, Jul 21, 2026 at 06:30:50PM +0000, bugzilla-daemon@kernel.org wrote: > https://bugzilla.kernel.org/show_bug.cgi?id=221776 > > --- Comment #1 from David Del Sol (daviddelsol1998@gmail.com) --- > From: David > Date: Tue, 21 Jul 2026 11:30:00 -0500 > Subject: [PATCH] usb: typec: ucsi: Skip UCSI on HP OmniBook X Flip (broken EC > firmware) > > The HP OmniBook X Flip (Ryzen AI 5 340) has a non-compliant UCSI > firmware in the embedded controller. The EC rejects all write/control > UCSI commands (SET_NOTIFICATION_ENABLE, PPM_RESET, etc.) while > accepting only read-only commands (GET_*). This causes the UCSI > subsystem to eventually corrupt the EC state, resulting in USB PD > negotiation falling back to 5V (only ~2W charging instead of 65W). > > Add a DMI-based quirk to prevent the ucsi_acpi driver from binding > to this hardware. Use NULL driver_data to signal "broken firmware, > skip UCSI entirely". > > The user-visible symptom is that with a 65W USB-C PD charger, the > battery charges at 2W instead of 25-30W after the first UCSI command > exchange. The workaround (removing this driver) has been verified > on multiple charge cycles. > > Link: https://bugzilla.kernel.org/show_bug.cgi?id=XXXXX > Signed-off-by: David Please send this to the linux-usb mailing list, with a proper name, and we will be glad to review it there. thanks, greg k-h