Sorry for the delay but I have finally got time to perform more tests.
# Testing with other devices
I've observed, that switching to other WiFi hot-spot makes a difference: the
problem is only observed, when "Lenovo W530" (Ubuntu) connects to "Speedport W
724v typ A". When testing with another hot-spot device or when testing hot-spot
with another device, everything works flawlessly. Hence, it looks like some
kind of compatibility issue.
# Testing Ubuntu Kernel-4.4.0
After system start:
- always works
After wake-up:
- rarely works
- sometimes re-connecting to WiFi suffices
- more often WLAN PM must be disabled
# Testing mainline Kernel-4.8.1
After system start:
- always needs a re-connection to WiFi
After wake-up:
- always works
# Further steps
I've noticed bios-outdated-2.65 flag added to the bug.
I'd like to update BIOS and see, if this could be solved that way.
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You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1618782
Title:
wifi stops functioning briefly after connecting to network
Status in linux package in Ubuntu:
Incomplete
Bug description:
On Lenovo W530, after upgrade from 14.04 to 16.04:
Although wifi card is still connected to the wifi-router (network manager
states so), no user traffic is passing through after a few seconds from
authentication.
Workaround: 'iwconfig wlan0 power off' executed after the connection
becomes unusable brings it back to operation.
ProblemType: Bug
DistroRelease: Ubuntu 16.04
Package: linux-image-4.4.0-36-generic 4.4.0-36.55
ProcVersionSignature: Ubuntu 4.4.0-36.55-generic 4.4.16
Uname: Linux 4.4.0-36-generic x86_64
NonfreeKernelModules: nvidia_uvm nvidia_modeset nvidia
ApportVersion: 2.20.1-0ubuntu2.1
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC1: kgar 4992 F.... pulseaudio
/dev/snd/controlC0: kgar 4992 F.... pulseaudio
CurrentDesktop: Unity
Date: Wed Aug 31 10:48:01 2016
HibernationDevice: RESUME=UUID=eeaac5ff-7cb9-4674-963c-2641065f84b6
InstallationDate: Installed on 2014-01-17 (956 days ago)
InstallationMedia: It
MachineType: LENOVO 244759G
ProcFB:
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.4.0-36-generic
root=UUID=20cbb6d9-2c69-427b-a27f-09a0787436b9 ro quiet splash
RelatedPackageVersions:
linux-restricted-modules-4.4.0-36-generic N/A
linux-backports-modules-4.4.0-36-generic N/A
linux-firmware 1.157.3
RfKill:
0: phy0: Wireless LAN
Soft blocked: no
Hard blocked: no
SourcePackage: linux
UpgradeStatus: Upgraded to xenial on 2016-08-13 (18 days ago)
dmi.bios.date: 02/27/2013
dmi.bios.vendor: LENOVO
dmi.bios.version: G5ET92WW (2.52 )
dmi.board.asset.tag: Not Available
dmi.board.name: 244759G
dmi.board.vendor: LENOVO
dmi.board.version: Win8 Pro DPK TPG
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: Not Available
dmi.modalias:
dmi:bvnLENOVO:bvrG5ET92WW(2.52):bd02/27/2013:svnLENOVO:pn244759G:pvrThinkPadW530:rvnLENOVO:rn244759G:rvrWin8ProDPKTPG:cvnLENOVO:ct10:cvrNotAvailable:
dmi.product.name: 244759G
dmi.product.version: ThinkPad W530
dmi.sys.vendor: LENOVO
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