Intel Wireless 8265 / 8275 [8086:24fd] subsystem [8086:0010]: Upgrading 18.04 to 20.04 causes Network/WIFI Throughput Slowdowns

[Patrick Gillespie]

In brief, I upgraded Kubuntu 18.04 to 20.04 Beta.

STEPS TO REPRODUCE
1. Connecting to as yet "random"(?) websites (duckduckgo, startpage, and OMGUbuntu for example) can result in extenuated wait times for page loading.
2. Attempting to updatwapt leads to failures to fetch.
3. Connecting to Speedtest.net resulted in 300 mbps upload and download whereas onnecting to https://www.speakeasy.net/speedtest/ resulted in a Connection Has Timed Out Error.

System: Host: ThinkPad Kernel: 5.4.0-21-generic x86_64 bits: 64 Desktop: KDE Plasma 5.18.3
           Distro: Ubuntu 20.04 LTS (Focal Fossa)
Machine: Type: Laptop System: LENOVO product: 20HF0012US v: ThinkPad T470s serial: <superuser/root required>
           Mobo: LENOVO model: 20HF0012US v: SDK0J40697 WIN serial: <superuser/root required> UEFI: LENOVO v: N1WET31W (1.10 )
           date: 04/17/2017
Battery: ID-1: BAT0 charge: 21.6 Wh condition: 22.0/23.5 Wh (94%)
           ID-2: BAT1 charge: 21.4 Wh condition: 21.7/26.3 Wh (82%)
CPU: Topology: Dual Core model: Intel Core i5-7300U bits: 64 type: MT MCP L2 cache: 3072 KiB
           Speed: 800 MHz min/max: 400/3500 MHz Core speeds (MHz): 1: 792 2: 830 3: 809 4: 822
Graphics: Device-1: Intel HD Graphics 620 driver: i915 v: kernel
           Display: x11 server: X.Org 1.20.7 driver: modesetting unloaded: fbdev,vesa resolution: 1920x1080~60Hz
           OpenGL: renderer: Mesa Intel HD Graphics 620 (KBL GT2) v: 4.6 Mesa 20.0.2
Audio: Device-1: Intel Sunrise Point-LP HD Audio driver: snd_hda_intel
           Sound Server: ALSA v: k5.4.0-21-generic
Network: Device-1: Intel Ethernet I219-LM driver: e1000e
           IF: enp0s31f6 state: down mac: c8:5b:76:e3:99:5b
           Device-2: Intel Wireless 8265 / 8275 driver: iwlwifi
           IF: wlp58s0 state: up mac: f8:59:71:49:f6:2e
Drives: Local Storage: total: 476.94 GiB used: 272.06 GiB (57.0%)
           ID-1: /dev/nvme0n1 vendor: Samsung model: SSD 960 PRO 512GB size: 476.94 GiB
Partition: ID-1: / size: 33.65 GiB used: 22.44 GiB (66.7%) fs: ext4 dev: /dev/nvme0n1p2
           ID-2: swap-1 size: 15.62 GiB used: 0 KiB (0.0%) fs: swap dev: /dev/nvme0n1p4
Sensors: System Temperatures: cpu: 36.5 C mobo: N/A
           Fan Speeds (RPM): cpu: 0
Info: Processes: 236 Uptime: 1d 19h 44m Memory: 19.43 GiB used: 6.50 GiB (33.5%) Shell: bash inxi: 3.0.38

WORKAROUND:

This may have to do with a Kernel Regression or is at least Kernel related? (This is getting quickly above my pay grade.) I used Grub Customizer to boot with kernel 4.18.5-041805-generic and network connectivity/throughput is now functioning as it should.
---
ProblemType: Bug
ApportVersion: 2.20.11-0ubuntu24
Architecture: amd64
AudioDevicesInUse:
 USER PID ACCESS COMMAND
 /dev/snd/controlC0: vtpoet 1245 F.... pulseaudio
CurrentDesktop: KDE
DistroRelease: Ubuntu 20.04
HibernationDevice: RESUME=UUID=b16057ef-f72d-4c02-9450-99b744e2e79c
InstallationDate: Installed on 2017-08-12 (971 days ago)
InstallationMedia: Kubuntu 17.04 "Zesty Zapus" - Release amd64 (20170412)
IwConfig:
 wlp58s0 no wireless extensions.

 enp0s31f6 no wireless extensions.

 lo no wireless extensions.
MachineType: LENOVO 20HF0012US
Package: linux (not installed)
ProcFB: 0 i915drmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.4.0-21-generic root=UUID=1d490228-1cc4-4d6b-a766-2a6a6b9dbe7d ro quiet splash vt.handoff=7
ProcVersionSignature: Ubuntu 5.4.0-21.25-generic 5.4.27
RelatedPackageVersions:
 linux-restricted-modules-5.4.0-21-generic N/A
 linux-backports-modules-5.4.0-21-generic N/A
 linux-firmware 1.187
Tags: focal
Uname: Linux 5.4.0-21-generic x86_64
UpgradeStatus: Upgraded to focal on 2020-04-03 (5 days ago)
UserGroups: adm cdrom dip lpadmin plugdev sambashare sudo
_MarkForUpload: True
dmi.bios.date: 04/17/2017
dmi.bios.vendor: LENOVO
dmi.bios.version: N1WET31W (1.10 )
dmi.board.asset.tag: Not Available
dmi.board.name: 20HF0012US
dmi.board.vendor: LENOVO
dmi.board.version: SDK0J40697 WIN
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: None
dmi.modalias: dmi:bvnLENOVO:bvrN1WET31W(1.10):bd04/17/2017:svnLENOVO:pn20HF0012US:pvrThinkPadT470s:rvnLENOVO:rn20HF0012US:rvrSDK0J40697WIN:cvnLENOVO:ct10:cvrNone:
dmi.product.family: ThinkPad T470s
dmi.product.name: 20HF0012US
dmi.product.sku: LENOVO_MT_20HF_BU_Think_FM_ThinkPad T470s
dmi.product.version: ThinkPad T470s
dmi.sys.vendor: LENOVO

[Ubuntu Foundations Team Bug Bot (crichton)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. It seems that your bug report is not filed about a specific source package though, rather it is just filed against Ubuntu in general. It is important that bug reports be filed about source packages so that people interested in the package can find the bugs about it. You can find some hints about determining what package your bug might be about at https://wiki.ubuntu.com/Bugs/FindRightPackage. You might also ask for help in the #ubuntu-bugs irc channel on Freenode.

To change the source package that this bug is filed about visit https://bugs.launchpad.net/ubuntu/+bug/1871408/+editstatus and add the package name in the text box next to the word Package.

[This is an automated message. I apologize if it reached you inappropriately; please just reply to this message indicating so.]

[Ubuntu Kernel Bot (ubuntu-kernel-bot)]

This bug is missing log files that will aid in diagnosing the problem. While running an Ubuntu kernel (not a mainline or third-party kernel) please enter the following command in a terminal window:

apport-collect 1871408

and then change the status of the bug to 'Confirmed'.

If, due to the nature of the issue you have encountered, you are unable to run this command, please add a comment stating that fact and change the bug status to 'Confirmed'.

This change has been made by an automated script, maintained by the Ubuntu Kernel Team.

[Patrick Gillespie (vermontpoet)]

Because the bug doesn't produce any error messages or a "crash" (segmentation violation, bus error, floating point exception, etc.)" apport wouldn't seem to be useful in this case? I'm going to mark the bug as 'Confirmed', according to your instructions, but by all means change if I'm incorrect.

[You-Sheng Yang (vicamo)]

Please still run apport because we rely on hardware info collected to investigate.

[Patrick Gillespie (vermontpoet)]

apport information

[Patrick Gillespie (vermontpoet)]

apport information

[Patrick Gillespie (vermontpoet)]

apport information

[Patrick Gillespie (vermontpoet)]

apport information

[Patrick Gillespie (vermontpoet)]

apport information

[Patrick Gillespie (vermontpoet)]

apport information

[Patrick Gillespie (vermontpoet)]

apport information

[Patrick Gillespie (vermontpoet)]

apport information

[Patrick Gillespie (vermontpoet)]

apport information

[Patrick Gillespie (vermontpoet)]

apport information

[Patrick Gillespie (vermontpoet)]

apport information

[Patrick Gillespie (vermontpoet)]

apport information

[Patrick Gillespie (vermontpoet)]

apport information

[Patrick Gillespie (vermontpoet)]

apport information

[Patrick Gillespie (vermontpoet)]

apport information

[Patrick Gillespie (vermontpoet)]

apport information

[Patrick Gillespie (vermontpoet)]

Done. Please, if possible, please apply this information to the two other reported bugs:

https://bugs.launchpad.net/bugs/1871411
https://bugs.launchpad.net/bugs/1871415

Of note: The throughput bug (WIFI) continued unabated soon as I went back to Kernel 5.4. I was back to "dail up" speeds in some cases.

[You-Sheng Yang (vicamo)]

Patrick, firstly you don't need the backport-iwlwifi-dkms for -generic kernels newer than v5.0 for 8265. It should have been directly supported.

Secondly, I can reproduce this with current linux 5.3.0-45, linux-firmware 1.183.5, and this cannot be fixed by upgrading to the latest 8265 fw of core47-142 release[1]. Would take some time to investigate more.

[1]: https://git.kernel.org/pub/scm/linux/kernel/git/iwlwifi/linux-firmware.git/commit/?id=4bebf45872a9818a17e2079118500030a8fa377a

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.

[khalil.io (khalil-io)]

The only solution I found to that speed drop was to reconnect to Wi-Fi or turn it off and on again. I'm not a developer and I don't know how to report with more data.

All I know is that running the command lspci:

01:00.0 Display controller: Advanced Micro Devices, Inc. [AMD/ATI] Polaris 22 MGL XL [Radeon Pro WX Vega M GL] (rev c0)
02:00.0 Network controller: Intel Corporation Wireless 8265 / 8275 (rev 78)
03:00.0 Unassigned class [ff00]: Realtek Semiconductor Co., Ltd. RTS525A PCI Express Card Reader (rev 01)

[khalil.io (khalil-io)]

apport information

Distro: Ubuntu 20.04 LTS (Focal Fossa)
Kernel version: 5.4.0-42-generic #46-Ubuntu SMP Fri Jul 10 00:24:02 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux

[khalil.io (khalil-io)]

apport information

The problem affects other linux distributions:
https://forums.linuxmint.com/viewtopic.php?t=309561

[khalil.io (khalil-io)]

apport information

More information about the problem:
https://bugzilla.kernel.org/show_bug.cgi?id=203709

[khalil.io (khalil-io)]

It seems that the error is with some IPv6 configuration. In Ubuntu, I disabled DNS and Auto Routes and the error went almost unnoticed

[Matej Mlakar (mlamat)]

My wifi connection with this Intel chipset keeps dropping every 30 minutes.