Bdtyktl

I've installed Ubuntu 18.04 LTS a few days and started having issues with the wifi adapter (intel dual band wireless ac-3160), where it would randomly stop working after some point of time (sometimes immediately after boot, sometimes hours after startup) and required a restart before it would work again. Looking through dmesg for clues as to what is going on, I saw

Queue 10 is active on fifo 2 and stuck for 10000 ms. SW [3, 19] HW [90, 90] FH TRB=0x05a5a5a5a

I'm not sure what's going on here but I've done some searching online and among the solutions i found (turn off power management, use an older kernel, update firmware, disable bluetooth, etc) none of them seem to work. I really want to keep using Ubuntu since it's so much more convenient to complete schoolwork with it rather than Windows but if I cannot fix this intermittent issue then I will have to go back to Windows :/

In your dmesg, we see these alarming lines:

[   47.424641] iwlwifi 0000:03:00.0: Failed to wake NIC for hcmd

[   47.424688] iwlwifi 0000:03:00.0: Error sending SCAN_OFFLOAD_REQUEST_CMD: enqueue_hcmd failed: -5

[   47.424694] iwlwifi 0000:03:00.0: Scan failed! ret -5

[   48.109479] iwlwifi 0000:03:00.0: iwlwifi transaction failed, dumping registers

A search suggests a possible fix. Reference: https://bbs.archlinux.org/viewtopic.php?id=240916

try "net.ipv4.tcp_ecn=0" (either a kernel parameter or via sysctl)

Let’s add this as a boot parameter and see if performance improves. From the terminal:

sudo nano /etc/default/grub

Find this line:

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"

Change it to this:

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash net.ipv4.tcp_ecn=0"

Save (Ctrl+o followed by Enter) and exit nano (Ctrl+x).

Now do:

sudo update grub

Reboot and paste, as above:

dmesg | grep iwl

And give us the link.