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Thu, 24 Sep 2026 08:58:58 -0700 (PDT) Received: from archlinux ([2405:201:1b:20ef:de2d:6e5b:74df:ad41]) by smtp.gmail.com with ESMTPSA id 98e67ed59e1d1-3a0972f111csm5690428a91.2.2026.09.24.08.58.55 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 24 Sep 2026 08:58:58 -0700 (PDT) Date: Thu, 24 Sep 2026 21:28:52 +0530 From: Krishna Chomal To: sjunhyuk1@gmail.com Cc: linux-usb@vger.kernel.org, platform-driver-x86@vger.kernel.org, Heikki Krogerus , Hans de Goede , Ilpo =?utf-8?B?SsOkcnZpbmVu?= Subject: Re: [BUG] HP OMEN Transcend 14 (board 8E41): GPU power ceiling on 65W USB-C charger is non-deterministic across sessions (25W vs ~65W) Message-ID: References: <20260922192312.40607-1-sjunhyuk1@gmail.com> 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=utf-8; format=flowed Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20260922192312.40607-1-sjunhyuk1@gmail.com> On Tue, Sep 22, 2026 at 03:23:12PM -0400, sjunhyuk1@gmail.com wrote: >Reporting a non-deterministic GPU power ceiling on a 65W USB-C charger, >in case it's useful alongside other recent reports of EC/PD-controller >firmware state issues (Legion Pro 7 16IAX10H, ASUS Vivobook K3605ZV). >I'm not certain this belongs to USB Type-C / UCSI rather than hp-wmi, >so I've sent it to both lists; happy to be redirected. > >System >------ >Model: HP OMEN Transcend Gaming Laptop 14-fb1013dx (B94GQUA#ABA) >Board: 8E41 >BIOS: F.05 (confirmed latest via fwupd/LVFS) >GPU: NVIDIA GeForce RTX 5060 Laptop GPU, VBIOS 98.06.2A.80.62 >Driver: NVIDIA Open 610.57.04 >Kernel: 7.2.5-3 (Arch, Omarchy) > [snip] > >Separately, this board also reproduces the NPCF ACPI-binding issue >described in NVIDIA/open-gpu-kernel-modules#1162 (Power Management >Object stays N/A, Dynamic Boost above the 50W base TGP never >activates) - confirmed via acpidump/iasl decompile, same topology and >field structure as reported there for board 8D40. That explains why >>50W boost never works here, but Power Management Object reads N/A in >both the 25W and 65W states, so it doesn't explain this particular >25W/65W split. Hi, While I am not sure why it switches between 25W/65W, I can take a look at why Dynamic Boost failing. Can you share acpidump please? Also Ilpo Järvinen, I just observed: when support for their board (8E41) was added in hp-wmi, the patch missed the Signed-off-by tag [1] [2]. I am not sure what we can do now, but just informing you. [1]: https://lore.kernel.org/all/20260203164832.40514-1-plotnikovanton@gmail.com [2]: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/drivers/platform/x86/hp/hp-wmi.c?id=729ffcffa73069cb066fd54a2bc7b09e5f782d48 >Full write-up with raw capture data: >https://claude.ai/artifact/WDAN76AWk1JpW49ZSGc2Cr > >Happy to gather more diagnostics (EC register snapshots, more repro >counts, anything else useful) if that would help narrow this down.