From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.2 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS, USER_AGENT_SANE_1 autolearn=no autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 37179C433E0 for ; Fri, 26 Feb 2021 12:33:41 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id D619164F1F for ; Fri, 26 Feb 2021 12:33:40 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230140AbhBZMdk (ORCPT ); Fri, 26 Feb 2021 07:33:40 -0500 Received: from server.atrad.com.au ([150.101.241.2]:35540 "EHLO server.atrad.com.au" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230045AbhBZMdj (ORCPT ); Fri, 26 Feb 2021 07:33:39 -0500 Received: from marvin.atrad.com.au (IDENT:1008@marvin.atrad.com.au [192.168.0.2]) by server.atrad.com.au (8.15.2/8.15.2) with ESMTPS id 11QCWX3F003084 (version=TLSv1.2 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=NO); Fri, 26 Feb 2021 23:02:34 +1030 Date: Fri, 26 Feb 2021 23:02:33 +1030 From: Jonathan Woithe To: Oliver Neukum Cc: linux-usb@vger.kernel.org, Mathias Nyman Subject: Re: Samsung T5 500 GB USB3.1 SSD fails with ASMedia ASM1142, 250 GB version works Message-ID: <20210226123232.GA26589@marvin.atrad.com.au> References: <20210219102218.GA29156@marvin.atrad.com.au> <20210222111707.GA26487@marvin.atrad.com.au> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20210222111707.GA26487@marvin.atrad.com.au> User-Agent: Mutt/1.10.1 (2018-07-13) X-MIMEDefang-action: accept X-Scanned-By: MIMEDefang 2.79 on 192.168.0.1 Precedence: bulk List-ID: X-Mailing-List: linux-usb@vger.kernel.org On Mon, Feb 22, 2021 at 09:47:07PM +1030, Jonathan Woithe wrote: > On Mon, Feb 22, 2021 at 11:24:18AM +0100, Oliver Neukum wrote: > > It is possible that the other machine can just supply more power. > > On the machine with the ASMedia controller (where the problem occurs), the > 500 GB SSD works perfectly well when connected to USB2 sockets. If a USB2 > socket can supply sufficient power, wouldn't a USB3 port be more than > capable? > > The specifications for both the 250 GB (working) and 500 GB (not working) > are 5V at 0.8A. I'm guessing this is a worst-case scenario. In any case, > this is well within the capabilities of a USB3 port. If there was a power > issue with one of these drives it's surprising it's not seen in both - > unless the 250 GB is just under the critical power threshold and the 500 GB > is just above it. Is there an easy way to tell if this is indeed the case? Another datapoint: on the system with the ASMedia controller where the 250 GB T5 SSD works but the 500 GB T5 SSD does not, the same USB3 socket is able to power a traditional 2.5" spinning rust hard drive without any obvious problems. Regards jonathan