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Bug#993068: SD don't detect by 0bda:0129 RTS5129 Card Reader with kernel 5.10

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Hello,

On Wed, Sep 16, 2026 at 10:57:33PM +0200, gianfranco giorgianni wrote:
> Reopening per the maintainer's request in the closing message — this
> reproduces exactly on the current bookworm-backports kernel.
> 
> Hardware: Samsung Galaxy Book 4 (DMI: SAMSUNG ELECTRONICS CO., LTD.
> 750XGK/NP750XGJ-KG5IT)
> Reader: Realtek RTS5129 (usb 0bda:0129)
> Kernel: 6.12.95+deb12-amd64 (bookworm-backports)
> 
> Same failure signature as the original report, continuous on every card
> insertion:
> 
>     mmc0: Card stuck being busy! __mmc_poll_for_busy
>     mmc0: error -110 whilst initialising SD card

110 is a timeout error. Can you confirm that happens with several
different cards?

> Regarding the commit mentioned earlier in this thread
> (4dad599b8b5d1ffc5ef12a2edb13d15d537202ba): I checked it, and it's a
> runtime-PM/polling-efficiency change (avoid polling when no card is
> present), not a fix for card initialization. It's already present in
> 6.12.95 and the failure still occurs, so that commit does not resolve this
> bug.
> 
> This confirms the RTS5129 incompatibility in
> rtsx_usb_sdmmc/rtsx_usb_ms/rtsx_usb (originally introduced in the
> 3.15->3.16 transition, see the 2015 LKML thread [1] and Ubuntu #1579748
> [2]) is still present, and that OEMs are still shipping this exact
> controller in new laptops as of 2023-2024 — so this will keep affecting new
> hardware, not just legacy devices.
> 
> Workaround: reverting to the old staging-era driver still works with zero
> source changes required against 6.12. Built and confirmed working via
> https://github.com/aurorafossorg/rts5139 (DKMS-packaged, survives kernel
> updates automatically). I've opened a PR there documenting this exact
> configuration: https://github.com/ljmf00/rts5139/pull/3 (pending merge).
> Blacklisting rtsx_usb_sdmmc/rtsx_usb_ms/rtsx_usb and loading that driver
> instead restores full read/write access.
> 
> Given this is an eleven-year-old regression that appears to be a genuine
> architectural gap (rtsx_usb_sdmmc is missing logic like rtsx_usb_get_rsp()
> that exists in the old driver), I don't expect an upstream fix soon, but
> wanted to leave this here for the next person who searches this error on
> newer hardware.

I think upstream should hear about that. To prepare a mail, can you
please verify that the issue also happens on a backport kernel (7.2.x)?
I guess yes, but upstream (understandably) doesn't like reports about
old kernels.

Best regards
Uwe

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Bug#993068: SD don't detect by 0bda:0129 RTS5129 Card Reader with kernel 5.10 Uwe Kleine-König <ukleinek@debian.org> - 2026-09-29 12:30 +0200

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