pc-kernel snap 4.15.0-152.159 (UC18) regression in network behaviour
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
linux (Ubuntu) |
Confirmed
|
Undecided
|
Unassigned |
Bug Description
Several amd64 devices have shown an marked increase in failures to complete automated testing with this kernel snap that is currently on 18/beta channel.
The devices tested are:
dawson-j
====
device type: NUC7PJYH, NUC7CJYH
processor: Pentium Silver J5005 1.50GHz, Celeron J4005 2.00GHz
ethernet: Realtek 10ec:8168
wireless: Intel 8086:31dc
dawson-i
====
device-type: NUC7i3DNHE, NUC7i5DNHE
processor: i3-7100U 2.40GHz, i5-7300U 2.60GHz
ethernet: Intel 8086:156f
wireless: Intel 8086:24fd
dearest-team
====
device-type: Inspiron 5758
processor: i5-5200U 2.20GHz
ethernet: Realtek 10ec:8136
wireless: Intel 8086:08b3
Symptoms shown by these devices are not the controller side that manages the test run loses connection with the device while carrying out WiFi connection tests. The failure rate does not appear to be 100%, there have been some runs that have completed.
dawson-j
====
Is using iwlwifi driver, the following information is collected about the driver during the testing:
18:05:08 Interface wlan0 using module iwlwifi
18:05:08 Parameters:
18:05:08 lar_disable: N
18:05:08 fw_monitor: N
18:05:08 11n_disable: 0
18:05:08 power_save: N
18:05:08 swcrypto: 0
18:05:08 antenna_coupling: 0
18:05:08 power_level: 0
18:05:08 amsdu_size: 0
18:05:08 uapsd_disable: 3
18:05:08 d0i3_timeout: 1000
18:05:08 fw_restart: Y
18:05:08 d0i3_disable: Y
18:05:08 led_mode: 0
18:05:08 disable_11ac: N
18:05:08 bt_coex_active: Y
18:05:08 nvm_file: (null)
18:05:08
18:05:08 Checking kernel ring buffer for iwlwifi messages:
18:05:08 kern :info : [Tue Jul 27 16:55:07 2021] iwlwifi 0000:00:0c.0: enabling device (0000 -> 0002)
18:05:08 kern :info : [Tue Jul 27 16:55:07 2021] iwlwifi 0000:00:0c.0: loaded firmware version 34.3125811985.0 op_mode iwlmvm
18:05:08 kern :info : [Tue Jul 27 16:55:07 2021] iwlwifi 0000:00:0c.0: Detected Intel(R) Dual Band Wireless AC 9462, REV=0x318
18:05:08 kern :info : [Tue Jul 27 16:55:07 2021] iwlwifi 0000:00:0c.0: base HW address: 68:ec:c5:46:aa:b4
18:05:08 kern :info : [Tue Jul 27 16:55:34 2021] iwlwifi 0000:00:0c.0: Conflict between TLV & NVM regarding enabling LAR (TLV = enabled NVM =disabled)
18:05:08 kern :err : [Tue Jul 27 16:55:34 2021] iwlwifi 0000:00:0c.0: BIOS contains WGDS but no WRDS