[Bug 1931442] Re: Fujitsu U7311 I219-LM wired onboard slow RX speeds

Thanks, please give this kernel a try:
https://people.canonical.com/~khfeng/lp1931442-2/

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https://bugs.launchpad.net/bugs/1931442

Title:
Fujitsu U7311 I219-LM wired onboard slow RX speeds

Status in linux package in Ubuntu:
Confirmed

Bug description:
Hello, i am having problem with very low RX speeds on my Fujitsu U7130
laptop's wired network with Intel I219-LM chip. When i start
downloading any larger content, the speed is very low (ranging from
150kbps-6Mbps) or even the transfer completely stops. RX_errors are
rising as well as rx_crc_errors when checking with "ethtool -S
enp0s31f6". Link speed is auto-negotiated to 1000Mbps and lowering the
speed manually is not having any effects on this issue. Wired TX
speeds seems to be unaffected. Wireless speeds on the AX201 are as
expected too.

I did try to solve this problem upgrading from Ubuntu 20.04 to 21.04
and using various kernels (5.8, 5.10, 5.11, 5.12.9). I also tried to
compile e1000e driver from sourceforge version 3.8.7
(https://sourceforge.net/projects/e1000/) with no joy.

Bug #1927925 seems to be related as the behavior is the same, but in
this case booting with kernel parameter "intel_idle.max_cstate=1" will
not resolve the issue.

lsb_release -rd
Description: Ubuntu 21.04
Release: 21.04

uname -a
Linux IO 5.11.0-18-generic #19-Ubuntu SMP Fri May 7 14:22:03 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux

apt-cache policy linux-image-5.11.0-18-generic
linux-image-5.11.0-18-generic:
Installed: 5.11.0-18.19
Candidate: 5.11.0-18.19
Version table:
*** 5.11.0-18.19 500
500 http://cz.archive.ubuntu.com/ubuntu hirsute-updates/main amd64 Packages
500 http://security.ubuntu.com/ubuntu hirsute-security/main amd64 Packages
100 /var/lib/dpkg/status

Thank you.
---
ProblemType: Bug
ApportVersion: 2.20.11-0ubuntu65.1
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC1: lk7r 2095 F.... pulseaudio
/dev/snd/controlC0: lk7r 2095 F.... pulseaudio
CasperMD5CheckResult: unknown
CurrentDesktop: ubuntu:GNOME
DistroRelease: Ubuntu 21.04
InstallationDate: Installed on 2021-05-23 (17 days ago)
InstallationMedia: Ubuntu 20.04.2.0 LTS "Focal Fossa" - Release amd64 (20210209.1)
MachineType: FUJITSU CLIENT COMPUTING LIMITED LIFEBOOK U7311
Package: linux (not installed)
ProcFB: 0 i915drmfb
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.11.0-18-generic root=UUID=b9466f2a-0840-40f4-8131-9b64200e5618 ro intel_idle.max_cstate=1 quiet splash vt.handoff=7
ProcVersionSignature: Ubuntu 5.11.0-18.19-generic 5.11.17
RelatedPackageVersions:
linux-restricted-modules-5.11.0-18-generic N/A
linux-backports-modules-5.11.0-18-generic N/A
linux-firmware 1.197
Tags: wayland-session hirsute
Uname: Linux 5.11.0-18-generic x86_64
UpgradeStatus: Upgraded to hirsute on 2021-06-08 (1 days ago)
UserGroups: adm cdrom dialout dip lpadmin lxd plugdev sambashare sudo video
_MarkForUpload: True
dmi.bios.date: 04/20/2021
dmi.bios.release: 2.14
dmi.bios.vendor: FUJITSU CLIENT COMPUTING LIMITED
dmi.bios.version: Version 2.14
dmi.board.name: FJNB2E7
dmi.board.vendor: FUJITSU CLIENT COMPUTING LIMITED
dmi.board.version: A3
dmi.chassis.type: 10
dmi.chassis.vendor: FUJITSU CLIENT COMPUTING LIMITED
dmi.chassis.version: LIFEBOOK U7311
dmi.modalias: dmi:bvnFUJITSUCLIENTCOMPUTINGLIMITED:bvrVersion2.14:bd04/20/2021:br2.14:svnFUJITSUCLIENTCOMPUTINGLIMITED:pnLIFEBOOKU7311:pvr10601736746:rvnFUJITSUCLIENTCOMPUTINGLIMITED:rnFJNB2E7:rvrA3:cvnFUJITSUCLIENTCOMPUTINGLIMITED:ct10:cvrLIFEBOOKU7311:
dmi.product.family: LIFEBOOK-FTS
dmi.product.name: LIFEBOOK U7311
dmi.product.sku: SK01
dmi.product.version: 10601736746
dmi.sys.vendor: FUJITSU CLIENT COMPUTING LIMITED

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