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We have 16 Lenovo M910q running with Ubuntu 16.04 without any Problems. Now we bought 20 M920q and are running into problems with network connection. After 16.04 didn't work we installed 18.04.
A ping to an address in our network showed some 1000 ms answer time.
After installing the hwe-kernel with linux 4.18 and compiling the network driver things looked a little bit better.
For some minutes connectivity was ok, answer times were under 1ms, but some time later answer times changed to some 100ms and 1000ms.
Is there a known problem with the intel I219LM (rev 10) in connection to linux?
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I seem to have the same problem.
When freshly booted the connection is fast and ping times are sub ms. After a while speed drops to even below 20kbps (not kBps) and ping times might go skyhigh (they don't always do that). At one time disabling-enabling the NIC seemed to help. WiFi works as it should.
Tried it with a non managed 1Gbps switch but had the same problem, disconnecting-reconnecting the cable helped once with that switch.
Normally connected to a cisco c2960s (configured auto and has negotiated to 1000Mb/s). There are no problems with other computers connected to that switch and the port I'm connected to was working fine with the m900 that I just replaced.
I've attached the ssu scan file.
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The latest driver (3.4.2.3 - 29.1.2019) seems to have helped.
I've got 15.2(2)E4 on my cisco switches and upgrading those would be a PITA since we have stacks with different models so finding the common software version is usually really hard.
I'll be back posting in case the problems continue.
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