** Changed in: linux-oem-6.14 (Ubuntu Noble)
Status: In Progress => Fix Committed
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https://bugs.launchpad.net/bugs/2115393
Title:
No IP Address assigned after hot-plugging Ethernet cable on HP
Platform
Status in HWE Next:
Triaged
Status in Ubuntu:
In Progress
Status in linux-oem-6.11 package in Ubuntu:
Invalid
Status in linux-oem-6.14 package in Ubuntu:
Invalid
Status in The Noble Numbat:
In Progress
Status in linux-oem-6.11 source package in Noble:
Fix Released
Status in linux-oem-6.14 source package in Noble:
Fix Committed
Status in The Plucky Puffin:
In Progress
Status in linux-oem-6.11 source package in Plucky:
Invalid
Status in linux-oem-6.14 source package in Plucky:
Invalid
Status in The Questing Quokka:
In Progress
Status in linux-oem-6.11 source package in Questing:
Invalid
Status in linux-oem-6.14 source package in Questing:
Invalid
Bug description:
[ Impact ]
On HP platform, a system equipped with Intel 8086:57a0 Ethernet
exhibits a symptom: after hot plugging the Ethernet cable, the network
interface can't get an IP address from DHCP server. This is caused by
a packet loss problem introduced by the commit from stable update:
96d4a384ccc2edfe5 e1000e: change k1 configuration on MTP and later
platforms
The packet loss problem reproduces with the 100% rate, when no packet
can be sent and received by the Ethernet controller, eventually block
the DCHP process.
Although there is an RFC patch [1] from upstream mailing list, it
simply introduces a module parameter which can turn the k1
configuration off. That being said, turning off the k1 configuration
would increase the system's power consumption.
[ Fix ]
For the temporary solution, we revert the following patch:
96d4a384ccc2edfe5 e1000e: change k1 configuration on MTP and later
platforms
[ Test Plan ]
1. Boot into Ubuntu kernel with Ethernet cable unplugged
2. Plug the Ethernet cable into the machine
3. Check if the system can get IP address from a DHCP server
[ Where problems could occur ]
Reverting the commit might cause minor packet loss on some platform,
said by the Intel Ethernet maintainer. That being said, we have not
observed it on our certified machines.
[ Additional Information ]
[1]
https://lore.kernel.org/netdev/[email protected]/
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