RTL8852BE: STA/AP concurrent mode fails on Kernel 6.14

[one-centavo]

Environment Information

• OS: Linux Mint 22.3 (Zena)
• Kernel: 6.14.0-37-generic
• Hardware: HP 15.6 inch Laptop PC (Firmware F.21)
• Wireless Chip: Realtek RTL8852BE (PCIe)

Description

I am trying to use STA/AP concurrent mode. While iw list confirms support, attempting to start a hotspot either hangs the system at "Creating virtual interface" or drops the STA connection (Case A).

Logs (dmesg)

When trying to apply power management fixes via /etc/modprobe.d/rtw89.conf, the kernel 6.14 ignores the parameters:
[ 3.118863] rtw89_core: unknown parameter 'disable_lps_deep' ignored [ 3.131619] rtw89_pci: unknown parameter 'disable_aspm' ignored

The driver loads successfully but seems unable to manage the virtual interface for AP mode:
[ 3.178115] rtw89_8852be 0000:02:00.0: Firmware version 0.29.29.5 (da87cccd) [ 3.485280] rtw89_8852be 0000:02:00.0: rfkill hardware state changed to enable

Steps taken

1. Verified iw list combinations.
2. Tried linux-wifi-hotspot with "same channel" (Channel 6).
3. Attempted to disable ASPM via modprobe (parameters ignored by kernel 6.14).

[JC3]

I have observed the same failure with the RTL8852BE on kernel 6.8 even though iw phy reports managed+AP as a valid interface combination, although my bring-up path is different than the post above:

1. iw phy phy0 interface add vwifi type __ap
2. ip a add dev vwifi 10.1.11.1/24
3. Start hostapd on interface vwifi.

In my situation, the virtual interface creation succeeds but hostapd fails to start with:

Could not set interface vwifi flags (UP): Name not unique on network
nl80211: Could not set interface 'vwifi' UP
nl80211: deinit ifname=vwifi disabled_11b_rates=0
nl80211 driver initialization failed.
vwifi: interface state UNINITIALIZED->DISABLED
vwifi: AP-DISABLED
vwifi: CTRL-EVENT-TERMINATING
hostapd_free_hapd_data: Interface vwifi wasn't started

[GongoraLeo]

I have observed the same failure with the RTL8852BE on kernel 6.8 even though iw phy reports managed+AP as a valid interface combination, although my bring-up path is different than the post above:

1. iw phy phy0 interface add vwifi type __ap
2. ip a add dev vwifi 10.1.11.1/24
3. Start hostapd on interface vwifi.

In my situation, the virtual interface creation succeeds but hostapd fails to start with:

Could not set interface vwifi flags (UP): Name not unique on network
nl80211: Could not set interface 'vwifi' UP
nl80211: deinit ifname=vwifi disabled_11b_rates=0
nl80211 driver initialization failed.
vwifi: interface state UNINITIALIZED->DISABLED
vwifi: AP-DISABLED
vwifi: CTRL-EVENT-TERMINATING
hostapd_free_hapd_data: Interface vwifi wasn't started

Ñl

[GongoraLeo]

I have observed the same failure with the RTL8852BE on kernel 6.8 even though iw phy reports managed+AP as a valid interface combination, although my bring-up path is different than the post above:

1. iw phy phy0 interface add vwifi type __ap
2. ip a add dev vwifi 10.1.11.1/24
3. Start hostapd on interface vwifi.

In my situation, the virtual interface creation succeeds but hostapd fails to start with:

Could not set interface vwifi flags (UP): Name not unique on network
nl80211: Could not set interface 'vwifi' UP
nl80211: deinit ifname=vwifivka disabled_11b_rates=0
nl80211 driver initialization failed.
vwifi: interface state UNINITIALIZED->DISABLED
vwifi: AP-DISABLED
vwifi: CTRL-EVENT-TERMINATING
hostapd_free_hapd_data: Interface vwifi wasn't started

Ñl