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Tue, 5 Aug 2025 07:57:47 +0000 Date: Tue, 5 Aug 2025 07:07:03 +0000 (UTC) From: Ulrich Stoehlker Reply-To: ustoehlker@yahoo.de To: linux-usb@vger.kernel.org Message-ID: <585146173.2802367.1754377623142@mail.yahoo.com> Subject: pl2303 converter - unknown device type 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 Content-Transfer-Encoding: 7bit References: <585146173.2802367.1754377623142.ref@mail.yahoo.com> X-Mailer: WebService/1.1.24260 YMailNodin Dear all, I have a Multi-Channel-Analyzer (MCA) interfaced via usb. This device cannot be used on more recent kernels. I get the following error message: [663822.490455] usb 1-3: new high-speed USB device number 17 using xhci_hcd [663822.616495] usb 1-3: New USB device found, idVendor=0557, idProduct=2008, bcdDevice= 0.01 [663822.616501] usb 1-3: New USB device strings: Mfr=0, Product=0, SerialNumber=0 [663822.682309] usbcore: registered new interface driver usbserial_generic [663822.682326] usbserial: USB Serial support registered for generic [663822.686383] usbcore: registered new interface driver pl2303 [663822.686402] usbserial: USB Serial support registered for pl2303 [663822.686423] pl2303 1-3:1.0: pl2303 converter detected [663822.686431] pl2303 1-3:1.0: unknown device type, please report to linux-usb@vger.kernel.org Linux host1 6.8.0-64-generic #67~22.04.1-Ubuntu SMP PREEMPT_DYNAMIC Tue Jun 24 15:19:46 UTC 2 x86_64 x86_64 x86_64 GNU/Linux But it works with older kernels: Linux host2 5.10.103-v7+ #1529 SMP Tue Mar 8 12:21:37 GMT 2022 armv7l GNU/Linux Would it be possible to correct this problem!? Best regards