I have tried the latest firmware on v4.18-rc1
(ce397d215ccd07b8ae3f71db689aedb85d56ab40) and the problem seems to persist:

7399 packets transmitted, 5704 received, 22% packet loss, time 7446041ms
rtt min/avg/max/mdev = 1.431/5.948/1057.709/36.507 ms, pipe 2

It is hard to tell for sure, but even though there still is a considerable
number of lost packets, stability seems a bit better.

It might be worth noting that the same problem has now appeared on Win10
after the April 2018 update. The latest Intel 8265 from the 14th of June
doesn't seem to do any good (microcode update?).

Please advise on how to proceed.

Thanks.

Best regards,
Gabriele

On Fri, 8 Jun 2018 at 20:01, Kai-Heng Feng <email address hidden>
wrote:

> There are lots of new commits in iwlwifi since v4.17-rc6. Please wait
> for v4.18-rc1 and give it a try.
>
> If the issue still happen, file a bug at
> https://bugzilla.kernel.org/enter_bug.cgi?product=Drivers, component:
> network-wireless.
>
> --
> You received this bug notification because you are subscribed to the bug
> report.
> https://bugs.launchpad.net/bugs/1772154
>
> Title:
>   Unstable WiFi adapter Gigabyte GC-WB867D-I
>
> Status in linux package in Ubuntu:
>   Confirmed
>
> Bug description:
>   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.
>
> To manage notifications about this bug go to:
> https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1772154/+subscriptions
>


-- 


*"Egli è scritto in lingua matematica, e i caratteri son triangoli, cerchi,
ed altre figuregeometriche, senza i quali mezzi è impossibile a intenderne
umanamente parola;senza questi è un aggirarsi vanamente per un oscuro
laberinto."*

*-- *G. Galilei*, Il saggiatore.*