Comment 52 for bug 1879633

Sorry, couldn't find the 2005 kernel in proposed so I don't know what got to my mind, but I pulled the firmware and kernel from your PPA this time.

Kernel:
5.10.0-2005-oem #6+lp1879633.1.ath11k.202011301608-Ubuntu

Linux firmware:
Package: linux-firmware
Version: 1.187.6+lp1879633.2.ath11k.202011301608

We have some progress, the driver loads the adapter and it shows up in iwconfig

wlp85s0 IEEE 802.11 ESSID:off/any
          Mode:Managed Access Point: Not-Associated Tx-Power=-2147483648 dBm
          Retry short limit:7 RTS thr:off Fragment thr:off
          Power Management:on

However, it is still not usable to connect to wireless network. kern.log gives me this

Dec 19 10:37:32 leonard-xps-13 kernel: [ 3.639819] ath11k_pci 0000:55:00.0: qmi req mem_seg[0] 0x27c00000 3522560 1
Dec 19 10:37:32 leonard-xps-13 kernel: [ 3.639822] ath11k_pci 0000:55:00.0: qmi req mem_seg[1] 0x28100000 884736 4
Dec 19 10:37:32 leonard-xps-13 kernel: [ 3.646471] ath11k_pci 0000:55:00.0: chip_id 0x0 chip_family 0xb board_id 0xff soc_id 0xffffffff
Dec 19 10:37:32 leonard-xps-13 kernel: [ 3.646473] ath11k_pci 0000:55:00.0: fw_version 0x101c06cc fw_build_timestamp 2020-06-24 19:50 fw_build_id

Dec 19 10:43:44 leonard-xps-13 kernel: [ 381.960254] mhi 0000:55:00.0: Device failed to exit MHI Reset state
Dec 19 10:43:44 leonard-xps-13 kernel: [ 381.960272] ath11k_pci 0000:55:00.0: firmware crashed: MHI_CB_SYS_ERROR
Dec 19 10:43:47 leonard-xps-13 kernel: [ 384.987469] ath11k_pci 0000:55:00.0: wmi command 12289 timeout
Dec 19 10:43:47 leonard-xps-13 kernel: [ 384.987476] ath11k_pci 0000:55:00.0: failed to send WMI_START_SCAN_CMDID
Dec 19 10:43:47 leonard-xps-13 kernel: [ 384.987481] ath11k_pci 0000:55:00.0: failed to start hw scan: -11
Dec 19 10:44:03 leonard-xps-13 kernel: [ 400.086374] ath11k_pci 0000:55:00.0: wmi command 12289 timeout
Dec 19 10:44:03 leonard-xps-13 kernel: [ 400.086380] ath11k_pci 0000:55:00.0: failed to send WMI_START_SCAN_CMDID
Dec 19 10:44:03 leonard-xps-13 kernel: [ 400.086387] ath11k_pci 0000:55:00.0: failed to start hw scan: -11