[BUG] rtw89: 8852CE BT A2DP stuttering with WiFi traffic, "timed out to flush queues", bogus -110 dBm RSSI (ThinkPad E16 Gen 2 AMD)

[BUG] rtw89: 8852CE BT A2DP stuttering with WiFi traffic, "timed out to flush queues", bogus -110 dBm RSSI (ThinkPad E16 Gen 2 AMD)

[Mauro]

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Hello,

on a ThinkPad E16 Gen 2 AMD with RTL8852CE, Bluetooth A2DP audio stutters
whenever WiFi carries traffic, even on 5 GHz and with all power saving
disabled.

System
  Machine:   ThinkPad E16 Gen 2 AMD (21M5CTO1WW), Ryzen 7 7735HS
  BIOS:      R2KET37W (1.26)
  Kernel:    7.2.9-200.fc44.x86_64 (Fedora 44)
  linux-fw:  20260916
  PipeWire 1.6.9, WirePlumber 0.5.18, BlueZ 5.87

WiFi
  10ec:c852, subsystem 17aa:5852, driver rtw89_8852ce
  Firmware 0.27.129.4 (3f1a5302), rtw89/rtw8852c_fw-2.bin
  chip info CID: 0, CV: 1, AID: 0, ACV: 0, RFE: 1
  Link: 5200 MHz, 80 MHz, -45 dBm, VHT-MCS 9 NSS 2

Bluetooth
  USB 0bda:5852, rtl_bt/rtl8852cu_fw_v2.bin + rtl8852cu_config.bin
  fw version 0x040d7225, lmp_subver 0x8852
  Codec in use: <SBC/AAC>

Settings tried (no improvement):
  options rtw89_core disable_ps_mode=y
  options rtw89_pci disable_aspm_l1=y disable_aspm_l1ss=y disable_clkreq=y
  options btusb enable_autosuspend=n
  options usbcore autosuspend=-1
  NetworkManager wifi.powersave=2 (iw: Power save: off)

Note: ASPM is firmware-controlled on this machine ("OS doesn't have ASPM
control"), so the rtw89_pci ASPM options may have no effect.

Observations
1) During traffic the driver logs:
     rtw89_8852ce 0000:03:00.0: timed out to flush queues
2) On a previous boot the log was flooded with:
     wlp3s0 (phy #0): CQM event: RSSI (-110 dBm) went above threshold
   -110 dBm looks like a placeholder value, not a real measurement
   (real signal -45..-62 dBm).
3) rtw89 IRQ rate: ~460/s under normal use, no interrupt storm.

Possibly relevant: the TSC is marked unstable at boot on this machine
(firmware issue, reported to platform-driver-x86) and the clocksource is
HPET, which may make the timing-sensitive coex path worse.

Similar report: https://discussion.fedoraproject.org/t/142165

I can provide btc_info from debugfs, traces, or test patches.

Thanks,
Mauro

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Diagnostic report generated 2026-10-09T01:14:43+02:00

===== Product =====
21M5CTO1WW

===== Family =====
ThinkPad E16 Gen 2

===== BIOS version =====
R2KET37W (1.26 )

===== BIOS date =====
12/03/2025
	Platform Firmware Revision: 1.26
	Embedded Controller Firmware Revision: 1.26

===== CPU =====
model name	: AMD Ryzen 7 7735HS with Radeon Graphics

===== OS =====
Fedora release 44 (Forty Four)

===== Kernel =====
7.2.9-200.fc44.x86_64

===== Kernel cmdline =====
BOOT_IMAGE=(hd1,gpt5)/vmlinuz-7.2.9-200.fc44.x86_64 root=UUID=0e58cb2f-c3de-4cf8-94d6-bc072ad60456 ro rootflags=subvol=root rd.luks.uuid=luks-5ece4f70-5fdd-48bd-87b6-a1b66505f82f rhgb quiet

===== linux-firmware =====
linux-firmware-20260916-1.fc44.noarch

===== PipeWire/WirePlumber/BlueZ =====
pipewire-1.6.9-1.fc44.x86_64
wireplumber-0.5.18-1.fc44.x86_64
bluez-5.87+1.git8750129efca8-1.fc44.x86_64

===== Current clocksource =====
hpet

===== Available clocksource =====
hpet acpi_pm 

===== TSC/clocksource (current boot) =====
ott 09 02:58:46 fedora kernel: tsc: Fast TSC calibration using PIT
ott 09 02:58:46 fedora kernel: tsc: Detected 3193.770 MHz processor
ott 09 02:58:46 fedora kernel: clocksource: refined-jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 1910969940391419 ns
ott 09 02:58:46 fedora kernel: clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 1911260446275000 ns
ott 09 02:58:46 fedora kernel: clocksource: hpet: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 133484873504 ns
ott 09 02:58:46 fedora kernel: clocksource: tsc-early: mask: 0xffffffffffffffff max_cycles: 0x2e094d080c9, max_idle_ns: 440795332932 ns
ott 09 02:58:46 fedora kernel: TSC synchronization [CPU#0 -> CPU#2]:
ott 09 02:58:46 fedora kernel: Measured 3446029760 cycles TSC warp between CPUs, turning off TSC clock.
ott 09 02:58:46 fedora kernel: tsc: Marking TSC unstable due to check_tsc_sync_source failed
ott 09 02:58:46 fedora kernel: clocksource: Switched to clocksource hpet
ott 09 02:58:46 fedora kernel: clocksource: acpi_pm: mask: 0xffffff max_cycles: 0xffffff, max_idle_ns: 2085701024 ns
ott 09 00:59:08 fedora kernel: kvm_amd: TSC scaling supported

===== TSC warp history (last 10 boots) =====
boot -1: ott 09 01:30:22 fedora kernel: Measured 4671344064 cycles TSC warp between CPUs, turning off TSC clock.
boot -2: set 29 04:32:31 fedora kernel: Measured 3445195424 cycles TSC warp between CPUs, turning off TSC clock.
boot -3: set 29 04:08:07 fedora kernel: Measured 3460586336 cycles TSC warp between CPUs, turning off TSC clock.
boot -4: set 29 04:02:45 fedora kernel: Measured 3468708704 cycles TSC warp between CPUs, turning off TSC clock.
boot -5: set 29 02:02:44 fedora kernel: Measured 3441246560 cycles TSC warp between CPUs, turning off TSC clock.
boot -6: set 26 17:41:40 fedora kernel: Measured 3446654560 cycles TSC warp between CPUs, turning off TSC clock.
boot -7: set 26 17:31:19 fedora kernel: Measured 3453351616 cycles TSC warp between CPUs, turning off TSC clock.
boot -8: set 26 17:16:23 fedora kernel: Measured 3453713408 cycles TSC warp between CPUs, turning off TSC clock.
boot -9: set 26 17:09:31 fedora kernel: Measured 3452821184 cycles TSC warp between CPUs, turning off TSC clock.
boot -10: set 26 17:05:07 fedora kernel: Measured 3469058720 cycles TSC warp between CPUs, turning off TSC clock.

===== RTC in local TZ =====
 
Warning: The system is configured to read the RTC time in the local time zone.
         This mode cannot be fully supported. It will create various problems
         with time zone changes and daylight saving time adjustments. The RTC
         time is never updated, it relies on external facilities to maintain it.
         If at all possible, use RTC in UTC by calling
         'timedatectl set-local-rtc 0'.
          RTC in local TZ: yes

===== WiFi PCI device =====
pcilib: Error reading /sys/bus/pci/devices/0000:00:08.3/label: Operation not permitted
03:00.0 Network controller [0280]: Realtek Semiconductor Co., Ltd. RTL8852CE PCIe 802.11ax Wireless Network Controller [10ec:c852] (rev 01)
	Subsystem: Lenovo Device [17aa:5852]
	Kernel driver in use: rtw89_8852ce
	Kernel modules: rtw89_8852ce

===== rtw89 kernel log =====
ott 09 00:59:09 fedora kernel: rtw89_8852ce 0000:03:00.0: loaded firmware rtw89/rtw8852c_fw-2.bin
ott 09 00:59:09 fedora kernel: rtw89_8852ce 0000:03:00.0: enabling device (0000 -> 0003)
ott 09 00:59:09 fedora kernel: rtw89_8852ce 0000:03:00.0: Firmware version 0.27.129.4 (3f1a5302), cmd version 0, type 1
ott 09 00:59:09 fedora kernel: rtw89_8852ce 0000:03:00.0: Firmware version 0.27.129.4 (3f1a5302), cmd version 0, type 3
ott 09 00:59:09 fedora kernel: rtw89_8852ce 0000:03:00.0: Firmware element BB version: 00 28 00 00
ott 09 00:59:09 fedora kernel: rtw89_8852ce 0000:03:00.0: Firmware element radio A version: 00 63 00 00
ott 09 00:59:09 fedora kernel: rtw89_8852ce 0000:03:00.0: Firmware element NCTL version: 00 11 00 00
ott 09 00:59:09 fedora kernel: rtw89_8852ce 0000:03:00.0: Firmware element TXPWR version: 00 82 00 00
ott 09 00:59:09 fedora kernel: rtw89_8852ce 0000:03:00.0: Firmware element PWR_TRK version: 00 26 00 00
ott 09 00:59:09 fedora kernel: rtw89_8852ce 0000:03:00.0: Firmware element REGD version: 00 49 00 3c
ott 09 00:59:09 fedora kernel: rtw89_8852ce 0000:03:00.0: chip info CID: 0, CV: 1, AID: 0, ACV: 0, RFE: 1
ott 09 00:59:09 fedora kernel: rtw89_8852ce 0000:03:00.0: rfkill hardware state changed to enable
ott 09 00:59:09 fedora kernel: rtw89_8852ce 0000:03:00.0 wlp3s0: renamed from wlan0
ott 09 01:02:53 fedora.fritz.box kernel: rtw89_8852ce 0000:03:00.0: timed out to flush queues
ott 09 01:02:53 fedora.fritz.box kernel: rtw89_8852ce 0000:03:00.0: timed out to flush queues

===== rtw89 module params =====
rtw89_core.disable_ps_mode=Y
rtw89_pci.disable_aspm_l1=Y
rtw89_pci.disable_aspm_l1ss=Y
rtw89_pci.disable_clkreq=Y

===== WiFi link (no SSID) =====
	freq: 5200.0
	signal: -45 dBm
	rx bitrate: 650.0 MBit/s VHT-MCS 7 80MHz short GI VHT-NSS 2
	tx bitrate: 866.7 MBit/s VHT-MCS 9 80MHz short GI VHT-NSS 2

===== WiFi power_save =====
Power save: off

===== CQM RSSI events (current boot, count) =====
0

===== CQM RSSI events (sample) =====

===== rtw89 IRQ (5 s delta) =====
IRQs in 5s: 2287

===== rtw89 BT coexistence (debugfs) =====

===== BT USB device =====
Bus 001 Device 002: ID 0bda:5852 Realtek Semiconductor Corp. Bluetooth Radio

===== BT kernel log =====
ott 09 02:58:46 fedora kernel: usb 1-4: Product: Bluetooth Radio
ott 09 00:59:08 fedora kernel: Bluetooth: Core ver 2.22
ott 09 00:59:08 fedora kernel: NET: Registered PF_BLUETOOTH protocol family
ott 09 00:59:08 fedora kernel: Bluetooth: HCI device and connection manager initialized
ott 09 00:59:08 fedora kernel: Bluetooth: HCI socket layer initialized
ott 09 00:59:08 fedora kernel: Bluetooth: L2CAP socket layer initialized
ott 09 00:59:08 fedora kernel: Bluetooth: SCO socket layer initialized
ott 09 00:59:08 fedora kernel: thinkpad_acpi: rfkill switch tpacpi_bluetooth_sw: radio is unblocked
ott 09 00:59:08 fedora kernel: usbcore: registered new interface driver btusb
ott 09 00:59:08 fedora kernel: Bluetooth: hci0: RTL: examining hci_ver=0c hci_rev=000c lmp_ver=0c lmp_subver=8852
ott 09 00:59:08 fedora kernel: Bluetooth: hci0: RTL: rom_version status=0 version=1
ott 09 00:59:08 fedora kernel: Bluetooth: hci0: RTL: btrtl_initialize: key id 0
ott 09 00:59:08 fedora kernel: Bluetooth: hci0: RTL: loading rtl_bt/rtl8852cu_fw_v2.bin
ott 09 00:59:08 fedora kernel: Bluetooth: hci0: RTL: loading rtl_bt/rtl8852cu_config.bin
ott 09 00:59:08 fedora kernel: Bluetooth: hci0: RTL: cfg_sz 6, total sz 71983
ott 09 00:59:09 fedora kernel: Bluetooth: BNEP (Ethernet Emulation) ver 1.3
ott 09 00:59:09 fedora kernel: Bluetooth: BNEP filters: protocol multicast
ott 09 00:59:09 fedora kernel: Bluetooth: BNEP socket layer initialized
ott 09 00:59:09 fedora kernel: Bluetooth: hci0: RTL: fw version 0x040d7225
ott 09 00:59:10 fedora kernel: Bluetooth: hci0: AOSP extensions version v1.00
ott 09 00:59:10 fedora kernel: Bluetooth: hci0: AOSP quality report is supported
ott 09 00:59:10 fedora kernel: Bluetooth: MGMT ver 1.23
ott 09 00:59:18 fedora kernel: Bluetooth: RFCOMM TTY layer initialized
ott 09 00:59:18 fedora kernel: Bluetooth: RFCOMM socket layer initialized
ott 09 00:59:18 fedora kernel: Bluetooth: RFCOMM ver 1.11
ott 09 00:59:31 fedora kernel: hid-generic 0005:046D:B034.0002: input,hidraw1: BLUETOOTH HID v0.09 Mouse [MX Master 3S] on XX:XX:XX:XX:XX:XX
ott 09 00:59:31 fedora kernel: logitech-hidpp-device 0005:046D:B034.0002: input,hidraw1: BLUETOOTH HID v0.09 Mouse [Logitech MX Master 3S] on XX:XX:XX:XX:XX:XX

===== btusb params =====
btusb.disable_scofix=N
btusb.enable_autosuspend=N
btusb.force_scofix=N
btusb.reset=Y

===== BT controller =====
Controller XX:XX:XX:XX:XX:XX (public)
	Manufacturer: 0x005d (93)
	Version: 0x0c (12)
	Class: 0x007c010c (8126732)
	Powered: yes
	PowerState: on
	Discoverable: no
	DiscoverableTimeout: 0x000000b4 (180)
	Pairable: yes
	UUID: Message Notification Se.. (00001133-0000-1000-8000-00805f9b34fb)
	UUID: A/V Remote Control        (0000110e-0000-1000-8000-00805f9b34fb)
	UUID: Vendor specific           (03b80e5a-ede8-4b33-a751-6ce34ec4c700)
	UUID: OBEX Object Push          (00001105-0000-1000-8000-00805f9b34fb)
	UUID: Message Access Server     (00001132-0000-1000-8000-00805f9b34fb)
	UUID: PnP Information           (00001200-0000-1000-8000-00805f9b34fb)
	UUID: IrMC Sync                 (00001104-0000-1000-8000-00805f9b34fb)
	UUID: Vendor specific           (00005005-0000-1000-8000-0002ee000001)
	UUID: A/V Remote Control Target (0000110c-0000-1000-8000-00805f9b34fb)
	UUID: Generic Attribute Profile (00001801-0000-1000-8000-00805f9b34fb)
	UUID: Phonebook Access Server   (0000112f-0000-1000-8000-00805f9b34fb)
	UUID: Audio Sink                (0000110b-0000-1000-8000-00805f9b34fb)
	UUID: Device Information        (0000180a-0000-1000-8000-00805f9b34fb)
	UUID: Generic Access Profile    (00001800-0000-1000-8000-00805f9b34fb)
	UUID: Phonebook Access Client   (0000112e-0000-1000-8000-00805f9b34fb)
	UUID: Handsfree Audio Gateway   (0000111f-0000-1000-8000-00805f9b34fb)
	UUID: Audio Source              (0000110a-0000-1000-8000-00805f9b34fb)
	UUID: OBEX File Transfer        (00001106-0000-1000-8000-00805f9b34fb)
	UUID: Handsfree                 (0000111e-0000-1000-8000-00805f9b34fb)
	Modalias: usb:v1D6Bp0246d0557
	Discovering: no
	Roles: central
	Roles: peripheral
Advertising Features:
	ActiveInstances: 0x00 (0)
	SupportedInstances: 0x0a (10)
	SupportedIncludes: tx-power
	SupportedIncludes: appearance
	SupportedIncludes: local-name
	SupportedSecondaryChannels: 1M
	SupportedSecondaryChannels: 2M
	SupportedSecondaryChannels: Coded
	SupportedCapabilities.MinTxPower: 0x0001 (1)
	SupportedCapabilities.MaxTxPower: 0x001d (29)
	SupportedCapabilities.MaxAdvLen: 0xfb (251)
	SupportedCapabilities.MaxScnRspLen: 0xfb (251)
	SupportedFeatures: CanSetTxPower
	SupportedFeatures: HardwareOffload

===== BT audio cards =====
		a2dp-sink-sbc: Riproduzione ad alta fedeltà (A2DP Sink, codec SBC) (sink: 1, sorgenti: 0, priorità: 132, disponibile: sì)
		a2dp-sink-sbc_xq: Riproduzione ad alta fedeltà (A2DP Sink, codec SBC-XQ) (sink: 1, sorgenti: 0, priorità: 131, disponibile: sì)
		a2dp-sink: Riproduzione ad alta fedeltà (A2DP Sink, codec AAC) (sink: 1, sorgenti: 0, priorità: 133, disponibile: sì)
		headset-head-unit-cvsd: Headset Head Unit (HSP/HFP, codec CVSD) (sink: 1, sorgenti: 1, priorità: 5, disponibile: sì)
		headset-head-unit: Headset Head Unit (HSP/HFP, codec MSBC) (sink: 1, sorgenti: 1, priorità: 6, disponibile: sì)

===== modprobe.d =====
/etc/modprobe.d/batman-adv-blacklist.conf:# This kernel module can be automatically loaded by non-root users. To
/etc/modprobe.d/batman-adv-blacklist.conf:# enhance system security, the module is blacklisted by default to ensure
/etc/modprobe.d/batman-adv-blacklist.conf:# system administrators make the module available for use as needed.
/etc/modprobe.d/batman-adv-blacklist.conf:# See https://access.redhat.com/articles/3760101 for more details.
/etc/modprobe.d/batman-adv-blacklist.conf:#
/etc/modprobe.d/batman-adv-blacklist.conf:# Remove the blacklist by adding a comment # at the start of the line.
/etc/modprobe.d/batman-adv-blacklist.conf:blacklist batman-adv
/etc/modprobe.d/btusb.conf:options btusb enable_autosuspend=n
/etc/modprobe.d/firewalld-sysctls.conf:install nf_conntrack /sbin/modprobe --ignore-install nf_conntrack $CMDLINE_OPTS && /sbin/sysctl --quiet --pattern 'net[.]netfilter[.]nf_conntrack.*' --system
/etc/modprobe.d/floppy-blacklist.conf:# This kernel module can be automatically loaded by non-root users. To
/etc/modprobe.d/floppy-blacklist.conf:# enhance system security, the module is blacklisted by default to ensure
/etc/modprobe.d/floppy-blacklist.conf:# system administrators make the module available for use as needed.
/etc/modprobe.d/floppy-blacklist.conf:# See https://access.redhat.com/articles/3760101 for more details.
/etc/modprobe.d/floppy-blacklist.conf:#
/etc/modprobe.d/floppy-blacklist.conf:# Remove the blacklist by adding a comment # at the start of the line.
/etc/modprobe.d/floppy-blacklist.conf:blacklist floppy
/etc/modprobe.d/l2tp_eth-blacklist.conf:# This kernel module can be automatically loaded by non-root users. To
/etc/modprobe.d/l2tp_eth-blacklist.conf:# enhance system security, the module is blacklisted by default to ensure
/etc/modprobe.d/l2tp_eth-blacklist.conf:# system administrators make the module available for use as needed.
/etc/modprobe.d/l2tp_eth-blacklist.conf:# See https://access.redhat.com/articles/3760101 for more details.
/etc/modprobe.d/l2tp_eth-blacklist.conf:#
/etc/modprobe.d/l2tp_eth-blacklist.conf:# Remove the blacklist by adding a comment # at the start of the line.
/etc/modprobe.d/l2tp_eth-blacklist.conf:blacklist l2tp_eth
/etc/modprobe.d/l2tp_netlink-blacklist.conf:# This kernel module can be automatically loaded by non-root users. To
/etc/modprobe.d/l2tp_netlink-blacklist.conf:# enhance system security, the module is blacklisted by default to ensure
/etc/modprobe.d/l2tp_netlink-blacklist.conf:# system administrators make the module available for use as needed.
/etc/modprobe.d/l2tp_netlink-blacklist.conf:# See https://access.redhat.com/articles/3760101 for more details.
/etc/modprobe.d/l2tp_netlink-blacklist.conf:#
/etc/modprobe.d/l2tp_netlink-blacklist.conf:# Remove the blacklist by adding a comment # at the start of the line.
/etc/modprobe.d/l2tp_netlink-blacklist.conf:blacklist l2tp_netlink
/etc/modprobe.d/l2tp_ppp-blacklist.conf:# This kernel module can be automatically loaded by non-root users. To
/etc/modprobe.d/l2tp_ppp-blacklist.conf:# enhance system security, the module is blacklisted by default to ensure
/etc/modprobe.d/l2tp_ppp-blacklist.conf:# system administrators make the module available for use as needed.
/etc/modprobe.d/l2tp_ppp-blacklist.conf:# See https://access.redhat.com/articles/3760101 for more details.
/etc/modprobe.d/l2tp_ppp-blacklist.conf:#
/etc/modprobe.d/l2tp_ppp-blacklist.conf:# Remove the blacklist by adding a comment # at the start of the line.
/etc/modprobe.d/l2tp_ppp-blacklist.conf:blacklist l2tp_ppp
/etc/modprobe.d/lockd.conf:#
/etc/modprobe.d/lockd.conf:# Set the NFS lock manager grace period. n is measured in seconds. 
/etc/modprobe.d/lockd.conf:#options lockd nlm_grace_period=90
/etc/modprobe.d/lockd.conf:#
/etc/modprobe.d/lockd.conf:# Set the TCP port that the NFS lock manager should use. 
/etc/modprobe.d/lockd.conf:# port must be a valid TCP port value (1-65535).
/etc/modprobe.d/lockd.conf:#options lockd nlm_tcpport
/etc/modprobe.d/lockd.conf:#
/etc/modprobe.d/lockd.conf:# Set the UDP port that the NFS lock manager should use.
/etc/modprobe.d/lockd.conf:# port must be a valid UDP port value (1-65535).
/etc/modprobe.d/lockd.conf:#options lockd nlm_udpport
/etc/modprobe.d/lockd.conf:#
/etc/modprobe.d/lockd.conf:# Set the maximum number of outstanding connections 
/etc/modprobe.d/lockd.conf:#options lockd nlm_max_connections=1024
/etc/modprobe.d/lockd.conf:#
/etc/modprobe.d/lockd.conf:# Set the default time value for the NFS lock manager
/etc/modprobe.d/lockd.conf:# in seconds. Default is 10 secs (min 3 max 20)
/etc/modprobe.d/lockd.conf:#options lockd nlm_timeout=10
/etc/modprobe.d/lockd.conf:#
/etc/modprobe.d/lockd.conf:# Choose whether to record the caller_name or IP address
/etc/modprobe.d/lockd.conf:# this peer in the local rpc.statd's database.
/etc/modprobe.d/lockd.conf:#options lockd nsm_use_hostnames=0
/etc/modprobe.d/nvdimm-security.conf:install libnvdimm /usr/bin/ndctl load-keys ; /sbin/modprobe --ignore-install libnvdimm $CMDLINE_OPTS
/etc/modprobe.d/rds-blacklist.conf:# This kernel module can be automatically loaded by non-root users. To
/etc/modprobe.d/rds-blacklist.conf:# enhance system security, the module is blacklisted by default to ensure
/etc/modprobe.d/rds-blacklist.conf:# system administrators make the module available for use as needed.
/etc/modprobe.d/rds-blacklist.conf:# See https://access.redhat.com/articles/3760101 for more details.
/etc/modprobe.d/rds-blacklist.conf:#
/etc/modprobe.d/rds-blacklist.conf:# Remove the blacklist by adding a comment # at the start of the line.
/etc/modprobe.d/rds-blacklist.conf:blacklist rds
/etc/modprobe.d/rtw89-bt-coex.conf:# Workaround coesistenza Wi-Fi/BT RTL8852CE
/etc/modprobe.d/rtw89-bt-coex.conf:options rtw89_core disable_ps_mode=y
/etc/modprobe.d/rtw89-bt-coex.conf:options rtw89_pci disable_clkreq=y disable_aspm_l1=y disable_aspm_l1ss=y
/etc/modprobe.d/rtw89-bt-coex.conf:options btusb enable_autosuspend=n
/etc/modprobe.d/rtw89.conf:options rtw89_core disable_ps_mode=y
/etc/modprobe.d/rtw89.conf:options rtw89_pci disable_aspm_l1=y disable_aspm_l1ss=y disable_clkreq=y
/etc/modprobe.d/usbcore.conf:options usbcore autosuspend=-1

===== NetworkManager conf.d =====
/etc/NetworkManager/conf.d/wifi-powersave.conf:[connection]
/etc/NetworkManager/conf.d/wifi-powersave.conf:wifi.powersave = 2
/etc/NetworkManager/conf.d/wifi-powersave-off.conf:[connection]
/etc/NetworkManager/conf.d/wifi-powersave-off.conf:wifi.powersave = 2

===== Kernel warnings (current boot) =====
ott 09 02:58:46 fedora kernel: TSC synchronization [CPU#0 -> CPU#2]:
ott 09 02:58:46 fedora kernel: Measured 3446029760 cycles TSC warp between CPUs, turning off TSC clock.
ott 09 02:58:46 fedora kernel:   #1  #3  #5  #7  #9 #11 #13 #15
ott 09 02:58:46 fedora kernel: virt/tdx: TDX not supported by the host platform
ott 09 02:58:46 fedora kernel: ACPI BIOS Error (bug): Could not resolve symbol [\_SB.PCI0.GPP0], AE_NOT_FOUND (20260408/dswload2-162)
ott 09 02:58:46 fedora kernel: ACPI Error: AE_NOT_FOUND, During name lookup/catalog (20260408/psobject-220)
ott 09 02:58:46 fedora kernel: ACPI BIOS Error (bug): Failure creating named object [\_SB.PCI0.GP17.XHC0.PSTA], AE_ALREADY_EXISTS (20260408/dswload2-326)
ott 09 02:58:46 fedora kernel: ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog (20260408/psobject-220)
ott 09 02:58:46 fedora kernel: ACPI BIOS Error (bug): Failure creating named object [\_SB._OSC], AE_ALREADY_EXISTS (20260408/dswload2-326)
ott 09 02:58:46 fedora kernel: ACPI Error: AE_ALREADY_EXISTS, During name lookup/catalog (20260408/psobject-220)
ott 09 02:58:46 fedora kernel: ACPI: \_SB_.PCI0.GP11: Overriding _PRW sleep state (S4) by S0 from power resources
ott 09 02:58:46 fedora kernel: ACPI: \_SB_.PCI0.GP12: Overriding _PRW sleep state (S4) by S0 from power resources
ott 09 02:58:46 fedora kernel: ACPI: \_SB_.PCI0.GP19.NHI0: Overriding _PRW sleep state (S3) by S0 from power resources
ott 09 02:58:46 fedora kernel: ACPI: \_SB_.PCI0.GP19.NHI1: Overriding _PRW sleep state (S3) by S0 from power resources
ott 09 02:58:46 fedora kernel: ACPI: thermal: [Firmware Bug]: No valid trip points!
ott 09 02:58:46 fedora kernel: Unstable clock detected, switching default tracing clock to "global"
                               If you want to keep using the local clock, then add:
                                 "trace_clock=local"
                               on the kernel command line
ott 09 02:58:50 fedora kernel: workqueue: name exceeds WQ_NAME_LEN. Truncating to: hdmi_frl_status_polling_workque
ott 09 02:58:57 fedora kernel: ucsi_acpi USBC000:00: error -ETIMEDOUT: PPM init failed
ott 09 00:59:08 fedora kernel: r8169 0000:02:00.0: can't disable ASPM; OS doesn't have ASPM control

RE: [BUG] rtw89: 8852CE BT A2DP stuttering with WiFi traffic, "timed out to flush queues", bogus -110 dBm RSSI (ThinkPad E16 Gen 2 AMD)

[Ping-Ke Shih]

Mauro <mauro.mossino91@gmail.com> wrote:
> Hello,
> 
> on a ThinkPad E16 Gen 2 AMD with RTL8852CE, Bluetooth A2DP audio stutters
> whenever WiFi carries traffic, even on 5 GHz and with all power saving
> disabled.
> 
> System
>   Machine:   ThinkPad E16 Gen 2 AMD (21M5CTO1WW), Ryzen 7 7735HS
>   BIOS:      R2KET37W (1.26)
>   Kernel:    7.2.9-200.fc44.x86_64 (Fedora 44)
>   linux-fw:  20260916
>   PipeWire 1.6.9, WirePlumber 0.5.18, BlueZ 5.87
> 
> WiFi
>   10ec:c852, subsystem 17aa:5852, driver rtw89_8852ce
>   Firmware 0.27.129.4 (3f1a5302), rtw89/rtw8852c_fw-2.bin
>   chip info CID: 0, CV: 1, AID: 0, ACV: 0, RFE: 1
>   Link: 5200 MHz, 80 MHz, -45 dBm, VHT-MCS 9 NSS 2
> 
> Bluetooth
>   USB 0bda:5852, rtl_bt/rtl8852cu_fw_v2.bin + rtl8852cu_config.bin
>   fw version 0x040d7225, lmp_subver 0x8852
>   Codec in use: <SBC/AAC>
> 
> Settings tried (no improvement):
>   options rtw89_core disable_ps_mode=y
>   options rtw89_pci disable_aspm_l1=y disable_aspm_l1ss=y disable_clkreq=y
>   options btusb enable_autosuspend=n
>   options usbcore autosuspend=-1
>   NetworkManager wifi.powersave=2 (iw: Power save: off)

Thanks. So the problem isn't because of power save.

> 
> Note: ASPM is firmware-controlled on this machine ("OS doesn't have ASPM
> control"), so the rtw89_pci ASPM options may have no effect.
> 
> Observations
> 1) During traffic the driver logs:
>      rtw89_8852ce 0000:03:00.0: timed out to flush queues

Can you describe how the traffic is?

Normally driver needs to flush queues for scanning or rekeying. 
Not sure why it depends on traffic. 

> 2) On a previous boot the log was flooded with:
>      wlp3s0 (phy #0): CQM event: RSSI (-110 dBm) went above threshold
>    -110 dBm looks like a placeholder value, not a real measurement
>    (real signal -45..-62 dBm).

I don't see the event in attachment. Where did you find it?

No clear idea why somehow hardware reported abnormal RSSI.


> 3) rtw89 IRQ rate: ~460/s under normal use, no interrupt storm.
> 
> Possibly relevant: the TSC is marked unstable at boot on this machine
> (firmware issue, reported to platform-driver-x86) and the clocksource is
> HPET, which may make the timing-sensitive coex path worse.
> 
> Similar report: https://discussion.fedoraproject.org/t/142165

It looks like there are many tests in the thread. Can you bisect the
cause in your side like the thread did? 

Ping-Ke