Public bug reported:
Since a few kernel upgrades ago, I am experiencing consistent Wi-Fi
connection failures on my 5GHz network. The connection drops repeatedly
with the specific error: AP is in CSA process, reject auth. Reverting to
7.0.0-27 does not fix it, neither does the latest mainline 7.1.x. Wifi
has been working without problems since I installed 26.04 so this
problem came with some of the latest kernel upgrades. It happens at
random, eg at fresh boot or after waking from suspend. Connecting to eg
mobile hotspot works 100% of the time, so this problem seems to be
related to 5GHz wifi.
OS: Ubuntu 26.04
Kernel: 7.0.0-29-generic
Hardware: Lenovo ThinkPad X1 Carbon Gen 12
Network Card: Intel Wi-Fi 6E AX211 160MHz
Firmware: 89.123cf747.0 ma-b0-gf-a0-89.ucode
Logs:
Aug 06 10:48:25 ThinkPad-X1-Carbon-Gen-12 kernel: wlp0s20f3: AP is in CSA
process, reject auth
Aug 06 10:48:37 ThinkPad-X1-Carbon-Gen-12 wpa_supplicant[7651]: wlp0s20f3: SME:
Authentication request to the driver failed
Aug 06 10:48:37 ThinkPad-X1-Carbon-Gen-12 kernel: wlp0s20f3: AP is in CSA
process, reject auth
Steps to Reproduce:
Attempt to connect to a 5GHz Wi-Fi network (WPA2-Personal).
Observe the connection failing to complete the handshake.
Observe the CSA process error in the logs.
Steps Already Taken (Troubleshooting):
Added options iwlwifi disable_11ax=Y to /etc/modprobe.d/iwlwifi.conf.
Tested with mobile hotspot (which seems to work, likely due to different
frequency/channel handling).
None of the above user-space workarounds resolved the issue, suggesting a
regression in the kernel/firmware handling of mac80211 management frames.
sudo lshw -C network
*-network
description: Wireless interface
product: Meteor Lake PCH CNVi WiFi
vendor: Intel Corporation
physical id: 14.3
bus info: pci@0000:00:14.3
logical name: wlp0s20f3
version: 20
serial: 98:bd:80:b4:65:f4
width: 64 bits
clock: 33MHz
capabilities: pm msi pciexpress msix bus_master cap_list ethernet
physical wireless
configuration: broadcast=yes driver=iwlwifi
driverversion=7.0.0-29-generic firmware=89.123cf747.0 ma-b0-gf-a0-89.uc
ip=10.208.104.226 latency=0 link=yes multicast=yes wireless=IEEE 802.11
resources: iomemory:400-3ff irq:18 memory:401a704000-401a707fff
lspci -nnk | grep -A3 Network
00:08.0 System peripheral [0880]: Intel Corporation Meteor Lake-P Gaussian &
Neural-Network Accelerator [8086:7e4c] (rev 20)
Subsystem: Lenovo Device [17aa:231e]
00:0a.0 Signal processing controller [1180]: Intel Corporation Meteor Lake-P
Platform Monitoring Technology [8086:7d0d] (rev 01)
Subsystem: Lenovo Device [17aa:231e]
--
00:14.3 Network controller [0280]: Intel Corporation Meteor Lake PCH CNVi WiFi
[8086:7e40] (rev 20)
Subsystem: Intel Corporation Device [8086:0090]
Kernel driver in use: iwlwifi
Kernel modules: iwlwifi
ProblemType: Bug
DistroRelease: Ubuntu 26.04
Package: linux-image-7.0.0-29-generic 7.0.0-29.29
ProcVersionSignature: Ubuntu 7.0.0-29.29-generic 7.0.12
Uname: Linux 7.0.0-29-generic x86_64
ApportVersion: 2.34.1-0ubuntu0.1
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: martin 4174 F.... pipewire
martin 4196 F.... wireplumber
/dev/snd/seq: martin 4174 F.... pipewire
CasperMD5CheckResult: pass
CurrentDesktop: ubuntu:GNOME
Date: Fri Aug 7 00:13:12 2026
InstallationDate: Installed on 2025-12-28 (221 days ago)
InstallationMedia: Ubuntu 25.10 "Questing Quokka" - Release amd64 (20251007)
MachineType: LENOVO 21KC005EMX
ProcFB: 0 i915drmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-7.0.0-29-generic
root=/dev/mapper/ubuntu--vg-ubuntu--lv ro quiet splash preempt=full
rcu_nocbs=all
crashkernel=2G-4G:320M,4G-32G:512M,32G-64G:1024M,64G-128G:2048M,128G-:4096M
preempt=full threadirqs rcu_nocbs=all
PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No
PulseAudio daemon running, or not running as session daemon.
SourcePackage: linux
UpgradeStatus: Upgraded to resolute on 2026-03-19 (140 days ago)
dmi.bios.date: 04/07/2026
dmi.bios.release: 1.49
dmi.bios.vendor: LENOVO
dmi.bios.version: N3YET84W (1.49 )
dmi.board.asset.tag: Not Available
dmi.board.name: 21KC005EMX
dmi.board.vendor: LENOVO
dmi.board.version: SDK0T76530 WIN
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: None
dmi.ec.firmware.release: 1.29
dmi.modalias:
dmi:bvnLENOVO:bvrN3YET84W(1.49):bd04/07/2026:br1.49:efr1.29:svnLENOVO:pn21KC005EMX:pvrThinkPadX1CarbonGen12:rvnLENOVO:rn21KC005EMX:rvrSDK0T76530WIN:cvnLENOVO:ct10:cvrNone:skuLENOVO_MT_21KC_BU_Think_FM_ThinkPadX1CarbonGen12:pfaThinkPadX1CarbonGen12:
dmi.product.family: ThinkPad X1 Carbon Gen 12
dmi.product.name: 21KC005EMX
dmi.product.sku: LENOVO_MT_21KC_BU_Think_FM_ThinkPad X1 Carbon Gen 12
dmi.product.version: ThinkPad X1 Carbon Gen 12
dmi.sys.vendor: LENOVO
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug resolute wayland-session
** Description changed:
- Since upgrading to kernel 7.0.0-27 on my Lenovo ThinkPad X1 Carbon Gen
- 12, I am experiencing consistent Wi-Fi connection failures on my 5GHz
- network. The connection drops repeatedly with the specific error: AP is
- in CSA process, reject auth.
+ Since a few kernel upgrades ago, I am experiencing consistent Wi-Fi
+ connection failures on my 5GHz network. The connection drops repeatedly
+ with the specific error: AP is in CSA process, reject auth. Reverting to
+ 7.0.0-27 does not fix it, neither does the latest mainline 7.1.x. Wifi
+ has been working without problems since I installed 26.04 so this
+ problem came with some of the latest kernel upgrades. It happens at
+ random, eg at fresh boot or after waking from suspend. Connecting to eg
+ mobile hotspot works 100% of the time, so this problem seems to be
+ related to 5GHz wifi.
OS: Ubuntu 26.04
- Kernel: 7.0.0-27-generic
+ Kernel: 7.0.0-29-generic
Hardware: Lenovo ThinkPad X1 Carbon Gen 12
Network Card: Intel Wi-Fi 6E AX211 160MHz
Firmware: 89.123cf747.0 ma-b0-gf-a0-89.ucode
Logs:
Aug 06 10:48:25 ThinkPad-X1-Carbon-Gen-12 kernel: wlp0s20f3: AP is in CSA
process, reject auth
Aug 06 10:48:37 ThinkPad-X1-Carbon-Gen-12 wpa_supplicant[7651]: wlp0s20f3:
SME: Authentication request to the driver failed
Aug 06 10:48:37 ThinkPad-X1-Carbon-Gen-12 kernel: wlp0s20f3: AP is in CSA
process, reject auth
Steps to Reproduce:
- Attempt to connect to a 5GHz Wi-Fi network (WPA2-Personal).
- Observe the connection failing to complete the handshake.
- Observe the CSA process error in the logs.
+ Attempt to connect to a 5GHz Wi-Fi network (WPA2-Personal).
+ Observe the connection failing to complete the handshake.
+ Observe the CSA process error in the logs.
Steps Already Taken (Troubleshooting):
- Added options iwlwifi disable_11ax=Y to /etc/modprobe.d/iwlwifi.conf.
- Tested with mobile hotspot (which seems to work, likely due to different
frequency/channel handling).
- None of the above user-space workarounds resolved the issue, suggesting a
regression in the kernel/firmware handling of mac80211 management frames.
+ Added options iwlwifi disable_11ax=Y to /etc/modprobe.d/iwlwifi.conf.
+ Tested with mobile hotspot (which seems to work, likely due to different
frequency/channel handling).
+ None of the above user-space workarounds resolved the issue, suggesting a
regression in the kernel/firmware handling of mac80211 management frames.
sudo lshw -C network
- *-network
- description: Wireless interface
- product: Meteor Lake PCH CNVi WiFi
- vendor: Intel Corporation
- physical id: 14.3
- bus info: pci@0000:00:14.3
- logical name: wlp0s20f3
- version: 20
- serial: 98:bd:80:b4:65:f4
- width: 64 bits
- clock: 33MHz
- capabilities: pm msi pciexpress msix bus_master cap_list ethernet
physical wireless
- configuration: broadcast=yes driver=iwlwifi
driverversion=7.0.0-29-generic firmware=89.123cf747.0 ma-b0-gf-a0-89.uc
ip=10.208.104.226 latency=0 link=yes multicast=yes wireless=IEEE 802.11
- resources: iomemory:400-3ff irq:18 memory:401a704000-401a707fff
-
+ *-network
+ description: Wireless interface
+ product: Meteor Lake PCH CNVi WiFi
+ vendor: Intel Corporation
+ physical id: 14.3
+ bus info: pci@0000:00:14.3
+ logical name: wlp0s20f3
+ version: 20
+ serial: 98:bd:80:b4:65:f4
+ width: 64 bits
+ clock: 33MHz
+ capabilities: pm msi pciexpress msix bus_master cap_list ethernet
physical wireless
+ configuration: broadcast=yes driver=iwlwifi
driverversion=7.0.0-29-generic firmware=89.123cf747.0 ma-b0-gf-a0-89.uc
ip=10.208.104.226 latency=0 link=yes multicast=yes wireless=IEEE 802.11
+ resources: iomemory:400-3ff irq:18 memory:401a704000-401a707fff
lspci -nnk | grep -A3 Network
00:08.0 System peripheral [0880]: Intel Corporation Meteor Lake-P Gaussian &
Neural-Network Accelerator [8086:7e4c] (rev 20)
- Subsystem: Lenovo Device [17aa:231e]
+ Subsystem: Lenovo Device [17aa:231e]
00:0a.0 Signal processing controller [1180]: Intel Corporation Meteor Lake-P
Platform Monitoring Technology [8086:7d0d] (rev 01)
- Subsystem: Lenovo Device [17aa:231e]
+ Subsystem: Lenovo Device [17aa:231e]
--
00:14.3 Network controller [0280]: Intel Corporation Meteor Lake PCH CNVi
WiFi [8086:7e40] (rev 20)
- Subsystem: Intel Corporation Device [8086:0090]
- Kernel driver in use: iwlwifi
- Kernel modules: iwlwifi
+ Subsystem: Intel Corporation Device [8086:0090]
+ Kernel driver in use: iwlwifi
+ Kernel modules: iwlwifi
ProblemType: Bug
DistroRelease: Ubuntu 26.04
Package: linux-image-7.0.0-29-generic 7.0.0-29.29
ProcVersionSignature: Ubuntu 7.0.0-29.29-generic 7.0.12
Uname: Linux 7.0.0-29-generic x86_64
ApportVersion: 2.34.1-0ubuntu0.1
Architecture: amd64
AudioDevicesInUse:
- USER PID ACCESS COMMAND
- /dev/snd/controlC0: martin 4174 F.... pipewire
- martin 4196 F.... wireplumber
- /dev/snd/seq: martin 4174 F.... pipewire
+ USER PID ACCESS COMMAND
+ /dev/snd/controlC0: martin 4174 F.... pipewire
+ martin 4196 F.... wireplumber
+ /dev/snd/seq: martin 4174 F.... pipewire
CasperMD5CheckResult: pass
CurrentDesktop: ubuntu:GNOME
Date: Fri Aug 7 00:13:12 2026
InstallationDate: Installed on 2025-12-28 (221 days ago)
InstallationMedia: Ubuntu 25.10 "Questing Quokka" - Release amd64 (20251007)
MachineType: LENOVO 21KC005EMX
ProcFB: 0 i915drmfb
ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-7.0.0-29-generic
root=/dev/mapper/ubuntu--vg-ubuntu--lv ro quiet splash preempt=full
rcu_nocbs=all
crashkernel=2G-4G:320M,4G-32G:512M,32G-64G:1024M,64G-128G:2048M,128G-:4096M
preempt=full threadirqs rcu_nocbs=all
PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No
PulseAudio daemon running, or not running as session daemon.
SourcePackage: linux
UpgradeStatus: Upgraded to resolute on 2026-03-19 (140 days ago)
dmi.bios.date: 04/07/2026
dmi.bios.release: 1.49
dmi.bios.vendor: LENOVO
dmi.bios.version: N3YET84W (1.49 )
dmi.board.asset.tag: Not Available
dmi.board.name: 21KC005EMX
dmi.board.vendor: LENOVO
dmi.board.version: SDK0T76530 WIN
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: None
dmi.ec.firmware.release: 1.29
dmi.modalias:
dmi:bvnLENOVO:bvrN3YET84W(1.49):bd04/07/2026:br1.49:efr1.29:svnLENOVO:pn21KC005EMX:pvrThinkPadX1CarbonGen12:rvnLENOVO:rn21KC005EMX:rvrSDK0T76530WIN:cvnLENOVO:ct10:cvrNone:skuLENOVO_MT_21KC_BU_Think_FM_ThinkPadX1CarbonGen12:pfaThinkPadX1CarbonGen12:
dmi.product.family: ThinkPad X1 Carbon Gen 12
dmi.product.name: 21KC005EMX
dmi.product.sku: LENOVO_MT_21KC_BU_Think_FM_ThinkPad X1 Carbon Gen 12
dmi.product.version: ThinkPad X1 Carbon Gen 12
dmi.sys.vendor: LENOVO
--
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Bugs, which is subscribed to Ubuntu.
https://bugs.launchpad.net/bugs/2162998
Title:
Intel AX211 Wi-Fi fails to connect (5GHz) - "AP is in CSA process,
reject auth" kernel regression
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