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Date: Sun, 08 Nov 2026 19:51:40 +0100
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From: Philipp <pjjonas@web.de>
To: linux-mmc@vger.kernel.org
Cc: regressions@lists.linux.dev, ulf.hansson@linaro.org
Subject: [REGRESSION] rtsx_usb_sdmmc: RTS5129 (0bda:0129) no longer detects SD card
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Hi,

the SD card in the internal Realtek RTS5129 USB card reader
(0bda:0129) of my Lenovo V110-15IKB is no longer detected.

Works:  6.12.116, 7.2.x
Broken: 6.18.x, 7.3.3

On broken kernels rtsx_usb and rtsx_usb_sdmmc load and the platform
devices rtsx_usb_sdmmc.0.auto / rtsx_usb_ms.1.auto exist, but no
mmc host/card appears (no mmc0, no mmcblk0) and there are no errors
in dmesg. Reloading rtsx_usb / rtsx_usb_sdmmc, re-inserting the card
and disabling USB autosuspend (power/control=on) do not help.

Since 7.2.x worked but 6.18.x does not, I suspect a change that was
backported to stable.

Distribution: NixOS (distribution kernel, no custom patches).

#regzbot introduced: v6.12..v6.18

Thanks,
Philipp