[REGRESSION] rtsx_usb_sdmmc: RTS5129 (0bda:0129) no longer detects SD card

[REGRESSION] rtsx_usb_sdmmc: RTS5129 (0bda:0129) no longer detects SD card

[Philipp]

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

Re: [REGRESSION] rtsx_usb_sdmmc: RTS5129 (0bda:0129) no longer detects SD card

[Thorsten Leemhuis]

On 11/8/26 19:51, Philipp wrote:
> 
> 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.

Might, but might not -- and I wonder if you have two bugs, some race, or
if some .config setting is disturbing something. Overall this situations
is somewhat puzzling. The best way to bring some light into this is afaics:

Check if 7.2 is working; if it is, bisect between that and 7.3.3; of
not, bisect between 7.2 and 7.2.x to find what fixes things. And ensure
to use the same .config as a base during the bisection, as explained here:
https://docs.kernel.org/admin-guide/verify-bugs-and-bisect-regressions.html

dmesg outputs from a working and a not-that-different version that is
broken (say 7.2 and 7.3.3) would be helpful, too.

Ciao, Thorsten