The WiFi adapter Gigabyte GC-WB867D-I is quite unstable on Ubuntu 18.04. I do not have data relative to previous versions of Ubuntu since this PCIe card is part of a new build that has had 18.04 as the first installed version.
The reason why I can point the finger at the Linux kernel is that the card seems to work reliably well on Windows 10 (no packet loss when pinging the local router). On Ubuntu 18.04, the card's behaviour seems very correlated to the signal strength and exhibits a threshold phenomenon. With the antenna placed in an obstacle-free area, some ping packets are occasionally lost. But when some objects are placed near the antenna (e.g. a phone), the packet loss can get up to 90%. Under the very same conditions, the packet loss on Windows is exactly 0 (and the RTT never gets above 500ms).
I have disabled the WiFi power saving (changed from 2 to 3) but that didn't fix the problem. It seems that restarting the NetworkManager service helps for a bit, but after a while the problem resurfaces.
The card in question has onboard USB Bluetooth and is pretty much an M.2 to PCIe x1 adapter for an Intel Wifi adapter. The relevant output of lspci is
03:00.0 Network controller: Intel Corporation Wireless 8265 / 8275 (rev 78)
ProblemType: Bug
DistroRelease: Ubuntu 18.04
Package: linux-image-4.15.0-20-generic 4.15.0-20.21
ProcVersionSignature: Ubuntu 4.15.0-20.21-generic 4.15.17
Uname: Linux 4.15.0-20-generic x86_64
NonfreeKernelModules: nvidia_modeset nvidia
ApportVersion: 2.20.9-0ubuntu7
Architecture: amd64
CurrentDesktop: ubuntu:GNOME
Date: Sat May 19 10:32:00 2018
InstallationDate: Installed on 2018-04-29 (19 days ago)
InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
SourcePackage: linux-signed
UpgradeStatus: No upgrade log present (probably fresh install)
---
ApportVersion: 2.20.9-0ubuntu7
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/pcmC1D7p: gabriele 1893 F...m pulseaudio
/dev/snd/controlC1: gabriele 1893 F.... pulseaudio
/dev/snd/controlC0: gabriele 1893 F.... pulseaudio
CurrentDesktop: ubuntu:GNOME
DistroRelease: Ubuntu 18.04
HibernationDevice: RESUME=UUID=d2390d6b-2bc3-41bb-b385-3dd8921a36e2
InstallationDate: Installed on 2018-04-29 (22 days ago)
InstallationMedia: Ubuntu 18.04 LTS "Bionic Beaver" - Release amd64 (20180426)
MachineType: To Be Filled By O.E.M. To Be Filled By O.E.M.
NonfreeKernelModules: nvidia_modeset nvidia
Package: linux (not installed)
ProcFB: 0 EFI VGA
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.15.0-20-generic root=UUID=2e79827f-410a-4aba-ab8f-e278ca6e7aa3 ro quiet splash vt.handoff=1
ProcVersionSignature: Ubuntu 4.15.0-20.21-generic 4.15.17
RelatedPackageVersions:
linux-restricted-modules-4.15.0-20-generic N/A
linux-backports-modules-4.15.0-20-generic N/A
linux-firmware 1.173
Tags: bionic
Uname: Linux 4.15.0-20-generic x86_64
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
_MarkForUpload: True
dmi.bios.date: 03/07/2018
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: P1.10
dmi.board.name: B360M Pro4
dmi.board.vendor: ASRock
dmi.chassis.asset.tag: To Be Filled By O.E.M.
dmi.chassis.type: 3
dmi.chassis.vendor: To Be Filled By O.E.M.
dmi.chassis.version: To Be Filled By O.E.M.
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrP1.10:bd03/07/2018:svnToBeFilledByO.E.M.:pnToBeFilledByO.E.M.:pvrToBeFilledByO.E.M.:rvnASRock:rnB360MPro4:rvr:cvnToBeFilledByO.E.M.:ct3:cvrToBeFilledByO.E.M.:
dmi.product.family: To Be Filled By O.E.M.
dmi.product.name: To Be Filled By O.E.M.
dmi.product.version: To Be Filled By O.E.M.
dmi.sys.vendor: To Be Filled By O.E.M.
Would it be possible for you to test the latest upstream kernel? Refer to https:/
If this bug is fixed in the mainline kernel, please add the following tag 'kernel-
If the mainline kernel does not fix this bug, please add the tag: 'kernel-
Once testing of the upstream kernel is complete, please mark this bug as "Confirmed".
Thanks in advance.
[0] http://