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([50.169.220.58]) by smtp.gmail.com with ESMTPSA id 586e51a60fabf-440d7b79ad4sm780168fac.4.2026.06.02.13.45.39 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 02 Jun 2026 13:45:40 -0700 (PDT) From: "Erich E. Hoover" To: Greg Kroah-Hartman Cc: linux-usb@vger.kernel.org, "Erich E. Hoover" Subject: [PATCH] USB: quirks: add NO_LPM for the Samsung T5 EVO Portable SSD Date: Tue, 2 Jun 2026 14:45:08 -0600 Message-ID: <20260602204508.48856-1-erich.e.hoover@gmail.com> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: linux-usb@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit The Samsung T5 EVO Portable SSD (04e8:6200) exhibit two forms of link instability when USB Link Power Management is enabled: 1. The units fail to initialize properly on first detection, resulting in a lockup in the drive where it must be power cycled or the kernel will not recognize the presence of the device. 2. If used for sustained operations (small amounts of continuous data are transferred to the unit) then the unit will "hiccup" after roughly 8 hours of use and will disconnect and reconnect. This has a certain probability of triggering the first issue, but also causes mount points to become invalid since the device gets issued a new letter. Signed-off-by: Erich E. Hoover --- drivers/usb/core/quirks.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/usb/core/quirks.c b/drivers/usb/core/quirks.c index 87810eff974e..80b61a799e8b 100644 --- a/drivers/usb/core/quirks.c +++ b/drivers/usb/core/quirks.c @@ -296,6 +296,9 @@ static const struct usb_device_id usb_quirk_list[] = { /* CarrolTouch 4500U */ { USB_DEVICE(0x04e7, 0x0030), .driver_info = USB_QUIRK_RESET_RESUME }, + /* Samsung T5 EVO Portable SSD */ + { USB_DEVICE(0x04e8, 0x6200), .driver_info = USB_QUIRK_NO_LPM }, + /* Samsung Android phone modem - ID conflict with SPH-I500 */ { USB_DEVICE(0x04e8, 0x6601), .driver_info = USB_QUIRK_CONFIG_INTF_STRINGS }, -- 2.43.0