Since a couple of days (May 2020) my Wifi Intel AC9260 causes big troubles on my Kubuntu 18.04LTS laptop.
Not sure which update exactly caused the problems, but Wifi is slow, and my cursor is stuttering. Disabling Wifi, or using a different WIfi USB adapter solves the problems.
Kernel:
uname -a
Linux 5.3.0-51-generic #44~18.04.2-Ubuntu SMP Thu Apr 23 14:27:18 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux
Wifi:
lspci -kvnn | sed -n '/Network/,/^$/ p'
3b:00.0 Network controller [0280]: Intel Corporation Wireless-AC 9260 [8086:2526] (rev 29)
Subsystem: Intel Corporation Device [8086:0014]
Flags: bus master, fast devsel, latency 0, IRQ 17
Memory at dc100000 (64-bit, non-prefetchable) [size=16K]
Capabilities: <access denied>
Kernel driver in use: iwlwifi
Kernel modules: iwlwifi
dmesg:
iwlwifi 0000:3b:00.0: Applying debug destination EXTERNAL_DRAM
iwlwifi 0000:3b:00.0: Collecting data: trigger 2 fired.
ieee80211 phy0: Hardware restart was requested
iwlwifi 0000:3b:00.0: Applying debug destination EXTERNAL_DRAM
iwlwifi 0000:3b:00.0: Applying debug destination EXTERNAL_DRAM
iwlwifi 0000:3b:00.0: FW already configured (0) - re-configuring
Bug-report
Cause update:linux-firmware:amd64 (1.173.17, 1.173.18)?
Any ideas for a workaround? Like up/downgrading the firmware manually? Tried to boot with a slightly older kernel in grub, but that did not help.
UPDATE: Even booting with the older 4.15.0-101-generic kernel I'm having the same problems.
UPDATE2 AFAICS somewhat solved with another update from today 20 May. Now disabling/enabling Wifi makes it workable, but the problem does recur at irregular intervals.
