XPS 13 9380 Wifi Problems Ubuntu

Same issues here with the XPS 13 9380 using the ath10k driver and Ubuntu 18.04.2 + latest updates. Just started happening a lot the last few days (perhaps an OS update triggered it) and only way to recover is to reboot. Very annoying, would love to have a fix.

Hi All,

I had the same problems with WiFi in Fedora 30 but it seems to be resolved with kernel 5.2.18. Please reply to my question at the end of this post.

Hardware: Dell XPS 13 (9380) with Killer Wireless-AC 1435 connected to a Compal Connect-Box (Liberty Global, UPC, Unitymedia). Same SSID assigned to 2.4 GHz and 5 GHz band, channel optimization is on.

OS: Fedora 30 Dual-Boot with Windows 10. The laptop came pre-installed with Windows 10.

Issue: WiFi is stable under Windows, but fails as described by users above under F30. After disabling 5 GHz in the Connect-Box the connection is stable in F30.

[local@localhost ~]$ lspci -k
02:00.0 Network controller: Qualcomm Atheros QCA6174 802.11ac Wireless Network Adapter (rev 32)
	Subsystem: Bigfoot Networks, Inc. Killer 1435 Wireless-AC
	Kernel driver in use: ath10k_pci
	Kernel modules: ath10k_pci

After recent updates the connection seems to be stable in dual-band mode (2.4 GHz and 5 GHz). Kernel:

[local@localhost ~]$ uname -r
5.2.18-200.fc30.x86_64

Summary: WiFi was unstable in F30 in the 5 GHz band, but not in the 2.4 GHz band.

Note that somebody filed bug 1751511 against kernel in Fedora 30.

Could someone who had the same connection problems please confirm that the connection problems only occur in the 5 GHz band?

Thank you!

Guys,

Just a quick update. Switching to the oem kernel solved my issue. I am running 4.15.0-1045-oem, though I presume the oem versions after that would work as well.

Short update: Since my last post on 09 Oct 2019 I had no connection issues anymore.  In the meantime I am on Kernel 5.3.6.

Unfortunately after some recent updates I again have the frequent WiFi connection freezes.

Kernel 5.3.7 still not working for me.

Wi-Fi is frequently dropping out (5 GHz)

$ uname -r
5.3.7-200.fc30.x86_64


$ lspci -k
3a:00.0 Network controller: Qualcomm Atheros QCA6174 802.11ac Wireless Network Adapter (rev 32)
Subsystem: Bigfoot Networks, Inc. Device 1535
Kernel driver in use: ath10k_pci
Kernel modules: ath10k_pci

However, I see that I am running a pretty old BIOS (2.3.1), and I see that version 2.9.0 has a potential fix: "Enhance Killer Wifi stability."

I trust that it will be solved after a BIOS upgrade.

Hi All,

I also had a major problem with resume after deep sleep, with wifi but caused by a Bluetooth issue. Please see my comment #87 (https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1799988/comments/87) and the foregoing comments.

My comment refers to a patch to apply to a kernel; I have applied that patch I refer to, to a 5.3.15 kernel source tree, rebuild the kernel (see your Ubuntu docs) and installed it. My problems with wifi after suspend/resume are gone.

Hope this helps others fixing this very annoying issue.

Also make sure your BIOS and Atheros firmware are up to date. Note for the previous poster, I upgraded my BIOS to [Vendor: Dell Inc. Version: 1.8.0 Release Date: 10/01/2019] (info from sudo dmidecode --type BIOS) but that in itself does *NOT* fix the problem. The BLE advertisement kernel patch did.

BTW: Running Devuan Beowulf (https://devuan.org/) on this nice laptop

Regards,

Steven

Please see my post on the second page for a fix (kernel patch) that when applied, fixes this annoying issue.

New to this forum so I replied to the last post; should have replied to this initial post.

Steven

Switching the Cable Router made the trick for me. My old Connect-Box was replaced by a new Vodafone Station (Arris TG3442DE) and since then no issues with 5 GHz and 2.4 GHz bands with ath10k.