RE: [BUG] wifi: rtw89: RTL8852BE firmware fails to leave LPS and recovery times out

[Ping-Ke Shih <pkshih@realtek.com>]

Rohit Mahesh <rm4336@columbia.edu>  wrote:
> I am seeing a recurring failure with the RTL8852BE while leaving low-power
> state. It has occurred (at least) twice with the same signature. The
< automatic hardware restart fails, after which wlan0 cannot be brought
> back up; rebooting or powering off restores normal operation.
> 
> Hardware:
> 
> Laptop: Lenovo IdeaPad Slim 3 15ABR8 (82XM)
> Mainboard: LNVNB161216
> BIOS: KYCN31WW, 2024-03-18
> 
> 02:00.0 Network controller [0280]:
> Realtek RTL8852BE PCIe 802.11ax [10ec]
> Subsystem: Lenovo [17aa:4853]
> Driver: rtw89_8852be
> 
> Software:
> 
> Distribution: Artix Linux
> Kernel: 7.1.4-artix1-1
> linux-firmware-realtek: 20260622-1
> Firmware file: rtw89/rtw8852b_fw-2.bin
> Firmware version: 0.29.29.18
> 
> Power-saving options are at their defaults:
> 
> rtw89_core.disable_ps_mode=N
> rtw89_pci.disable_aspm_l1=N
> rtw89_pci.disable_aspm_l1ss=N
> rtw89_pci.disable_clkreq=N

Try to set these to Y to see if help.

> 
> The incidents occurred on:
> 
> 2026-07-30 17:57:30 America/Detroit
> 2026-07-31 11:29:17 America/Detroit
> 
> Both started with:
> 
> rtw89_8852be 0000:02:00.0: failed to pre-release fwcmd
> rtw89_8852be 0000:02:00.0: firmware failed to ack for leaving ps mode
> rtw89_8852be 0000:02:00.0: SER catches error: 0x4000
> rtw89_8852be 0000:02:00.0: rtw89: failed to leave lps state
> rtw89_8852be 0000:02:00.0: FW backtrace invalid key: 0xffffffff
> rtw89_8852be 0000:02:00.0: xtal si not ready(W): offset=90 val=10 mask=10
> ieee80211 phy0: Hardware restart was requested
> rtw89_8852be 0000:02:00.0: mac preinit fail, ret: -110
> mac80211: Hardware became unavailable during restart.
> rtw89_8852be 0000:02:00.0: Err: ser L2 re-config timeout

Did it occur right after system resume? Can you share the full log?

> 
> The failed restart also triggers several mac80211 warnings during interface
> teardown. Subsequent attempts to initialize wlan0 fail with connection
> timeouts and repeated “mac preinit fail, ret: -110” messages.
> NetworkManager eventually stops trying to acquire the supplicant interface.

Mailing list only accepts plain text mail. I also wrap liens.
Also please remember not top-posting.

> 
> Possible regression:
> 
> On 2026-07-26, I upgraded:
> 
> linux: 7.0.3.artix1-2 -> 7.1.4.artix1-1
> linux-firmware-realtek: 20260410-1 -> 20260622-1
> 
> The rtw8852b_fw-2.bin file changed in that firmware update, and both
> failures occurred afterward. I have not yet tested the previous
> kernel/firmware combination or a vanilla upstream kernel, so I cannot
> determine whether the regression is in the kernel or firmware.

If you can point a version that can work well on your platform, it'd be
helpful to bisect the cause.

Ping-Ke