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Tue, 21 Oct 2025 09:01:57 -0700 (PDT) Received: from rowland.harvard.edu ([2601:19b:d03:1700::ba76]) by smtp.gmail.com with ESMTPSA id af79cd13be357-891cf58edb6sm787342685a.48.2025.10.21.09.01.56 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 21 Oct 2025 09:01:57 -0700 (PDT) Date: Tue, 21 Oct 2025 12:01:54 -0400 From: Alan Stern To: Julian Sikorski Cc: USB list Subject: Re: USB A 3.0 port on Asus Zenbook not recognising the TipToi pen Message-ID: <4c6bbcd1-0ed2-496d-82c4-3fc9a1c2660e@rowland.harvard.edu> References: <1393a6c5-3430-49cb-95e6-b18c0f5328b0@gmail.com> <967e7681-c9ff-4421-ba89-d83bb40f1af3@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=us-ascii Content-Disposition: inline In-Reply-To: <967e7681-c9ff-4421-ba89-d83bb40f1af3@gmail.com> On Tue, Oct 21, 2025 at 04:44:24PM +0200, Julian Sikorski wrote: > Am 19.10.25 um 17:43 schrieb Alan Stern: > > On Sun, Oct 19, 2025 at 08:34:27AM +0200, Julian Sikorski wrote: > > > Hello, > > > > > > disclaimer: this is not linux-specific as Windows 11 also fails to recognise > > > the devices, but maybe someone has ideas regarding the causes here. > > > I have two TipToi Pens by Ravensburger. These are recognised as > > > > > > 04d6:e101 Mentor Graphics usbdisk > > > > > > when plugged into USB C port via USB C to micro B cable. When plugged into > > > the USB A port, the following messages are reported into the journal: > > > > > > Okt 19 08:19:08 kernel: usb usb3-port2: Cannot enable. Maybe the USB cable > > > is bad? > > > Okt 19 08:19:09 kernel: usb usb3-port2: Cannot enable. Maybe the USB cable > > > is bad? > > > Okt 19 08:19:09 kernel: usb usb3-port2: attempt power cycle > > > Okt 19 08:19:10 kernel: usb usb3-port2: Cannot enable. Maybe the USB cable > > > is bad? > > > Okt 19 08:19:11 kernel: usb usb3-port2: Cannot enable. Maybe the USB cable > > > is bad? > > > Okt 19 08:19:11 kernel: usb usb3-port2: unable to enumerate USB device > > > > > > I have two pens. I tried two cables delivered with them, as well as a > > > different USB A to micro B cable I had. All exhibit the same issue. > > > Does anyone have any ideas what could be the problem? My first guess is that > > > both the laptop and the pen are slightly off-spec in some strange way, which > > > causes them not to work together. The USB A slot on the laptop works fine > > > with other devices, and the pen works with the laptop if connected to USB C. > > > > Have you tried using the pens on a different computer? > > > > Alan Stern > > Hi, > > I did, I just tried again to be sure - with the allegedly broken cable. This > is on my ASRock Fatal1ty B450 Gaming-ITX/ac front panel USB: > > Okt 21 16:42:00 kernel: usb 1-3: new high-speed USB device number 4 using > xhci_hcd > Okt 21 16:42:00 kernel: usb 1-3: New USB device found, idVendor=04d6, > idProduct=e101, bcdDevice= 1.00 ... That certainly indicates part of the problem is in the laptop. What happens if you try connecting one of the pens to the laptop through a USB hub? Alan Stern