** Description changed:
- [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.
+ [ Impact ]
- [Fix]
- Revert the following patch from upstream stable update:
+ 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
- [Test Plan]
+ 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]
- It's a revert so we won't get any regression.
+ [ 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]/
** Also affects: linux-oem-6.11 (Ubuntu Plucky)
Importance: Undecided
Status: New
** Also affects: linux-oem-6.14 (Ubuntu Plucky)
Importance: Undecided
Status: New
** Also affects: Ubuntu Plucky
Importance: Undecided
Status: New
** Also affects: linux-oem-6.11 (Ubuntu Questing)
Importance: Undecided
Status: Invalid
** Also affects: linux-oem-6.14 (Ubuntu Questing)
Importance: Undecided
Status: New
** Also affects: Ubuntu Questing
Importance: Undecided
Status: In Progress
** Changed in: Ubuntu Plucky
Status: New => In Progress
** Changed in: linux-oem-6.14 (Ubuntu Noble)
Status: New => In Progress
** Changed in: linux-oem-6.14 (Ubuntu Plucky)
Status: New => Invalid
** Changed in: linux-oem-6.14 (Ubuntu Questing)
Status: New => Invalid
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https://bugs.launchpad.net/bugs/2115393
Title:
No IP Address assigned after hot-plugging Ethernet cable on HP
Platform
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