Bug#1125797: linux: trixie stable update regresses for rtw88 driver

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From	Salvatore Bonaccorso <carnil@debian.org>
Newsgroups	linux.debian.bugs.dist, linux.debian.kernel
Subject	Bug#1125797: linux: trixie stable update regresses for rtw88 driver
Date	Sun, 18 Jan 2026 17:40:01 +0100
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Control: tags -1 + confirmed fixed-upstream

On Sun, Jan 18, 2026 at 12:26:33AM +0100, Bastian Germann wrote:
> Source: linux
> Version: 6.12.63-1
> Severity: important
> Tags: upstream
> 
> The recently released trixie stable update contains change:
> wifi: rtw88: sdio: use indirect IO for device registers before power-on
> (linux stable commit bc1ca06998c1cb6d58e02e0f28c032ec88eb45dd)
> 
> This regresses and kills my wifi. The following linux-stable v6.12.64
> already has the fix with a description of the bug that I am experiencing:
> 
> commit 1f8ae2e99a9df11a7951d972c119a2f0d3a41a6a
> Author: Ping-Ke Shih <pkshih@realtek.com>
> Date:   Tue Nov 25 09:38:49 2025 +0800
> 
>     wifi: rtw88: limit indirect IO under powered off for RTL8822CS
> 
>     [ Upstream commit f3ccdfda345ca9a624ea425840a926b8338c1e25 ]
> 
>     The indirect IO is necessary for RTL8822CS, but not necessary for other
>     chips. Otherwiese, it throws errors and becomes unusable.
> 
>      rtw88_8723cs mmc1:0001:1: WOW Firmware version 11.0.0, H2C version 0
>      rtw88_8723cs mmc1:0001:1: Firmware version 11.0.0, H2C version 0
>      rtw88_8723cs mmc1:0001:1: sdio read32 failed (0xf0): -110
>      rtw88_8723cs mmc1:0001:1: sdio write8 failed (0x1c): -110
>      rtw88_8723cs mmc1:0001:1: sdio read32 failed (0xf0): -110
> 
>     By vendor driver, only RTL8822CS and RTL8822ES need indirect IO, but
>     RTL8822ES isn't supported yet. Therefore, limit it to RTL8822CS only.
> 
>     Reported-by: Andrey Skvortsov <andrej.skvortzov@gmail.com>
>     Closes: https://lore.kernel.org/linux-wireless/07a32e2d6c764eb1bd9415b5a921a652@realtek.com/T/#m997b4522f7209ba629561c776bfd1d13a
> b24c1d4
>     Fixes: 58de1f91e033 ("wifi: rtw88: sdio: use indirect IO for device registers before power-on")
>     Signed-off-by: Ping-Ke Shih <pkshih@realtek.com>
>     Tested-by: Andrey Skvortsov <andrej.skvortzov@gmail.com>
>     Link: https://patch.msgid.link/1764034729-1251-1-git-send-email-pkshih@realtek.com
>     Signed-off-by: Sasha Levin <sashal@kernel.org>
> 
> Please upload a stable update as soon as possible.

Thanks for pinpointing the fix, it will be included in the next upload
we will peform.

Regards,
Salvatore

Thread

Bug#1125797: linux: trixie stable update regresses for rtw88 driver Bastian Germann <bage@debian.org> - 2026-01-18 00:30 +0100
  Processed: Re: Bug#1125797: linux: trixie stable update regresses  for rtw88 driver "Debian Bug Tracking System" <owner@bugs.debian.org> - 2026-01-18 17:40 +0100
  Processed: Re: Bug#1125797: linux: trixie stable update regresses  for rtw88 driver "Debian Bug Tracking System" <owner@bugs.debian.org> - 2026-01-18 17:40 +0100
  Bug#1125797: linux: trixie stable update regresses for rtw88 driver Salvatore Bonaccorso <carnil@debian.org> - 2026-01-18 17:40 +0100
  Bug#1125797: found 1125797 in 6.17.8-1, found 1125797 in 6.18~rc4-1~exp1, closing 1125797, closing 1125797 Salvatore Bonaccorso <carnil@debian.org> - 2026-01-18 20:50 +0100

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