https://bugzilla.kernel.org/show_bug.cgi?id=202675
Bug ID: 202675
Summary: Autonegotiation fails for various Lenovo notebooks
when resuming inside the docking station
Product: ACPI
Version: 2.5
Kernel Version: 5.0-rc8
Hardware: Intel
OS: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: EC
Assignee: [email protected]
Reporter: [email protected]
Regression: No
The autonegotiation fails sporadically for various Lenovo notebooks (e.g.
T450s, T550, W540) when resuming inside the docking station. The speed ethtool
reports is 10Mb/s, full duplex, even though that is not the speed the connected
switch uses. So the systems are unable to send/receive any packages.
Issuing the command "ethtool -r eth0" does not lead to a successful
renegotiation. To get a correct link, I have to either undock the notebook for
about 15 seconds, and then re-dock it, or disconnect the LAN cable for about 15
seconds, and then reconnect the cable.
In my case the problem appears about one time in 10-20 suspend/resume cycles.
I found the problem in the 4.15 Ubuntu Bionic kernel, but the problem is still
present in kernel 5.0-rc8.
I've done a git bisect and the following commit seems to have introduced the
problem:
commit 04e04009bb01502f8023c707d7569ea42fba903b
Author: Rafael J. Wysocki <[email protected]>
Date: Fri Feb 9 22:55:28 2018 +0100
ACPI / EC: Restore polling during noirq suspend/resume phases
BugLink: http://bugs.launchpad.net/bugs/1774063
[ Upstream commit 3cd091a773936c54344a519f7ee1379ccb620bee ]
Commit 662591461c4b (ACPI / EC: Drop EC noirq hooks to fix a
regression) modified the ACPI EC driver so that it doesn't switch
over to busy polling mode during noirq stages of system suspend and
resume in an attempt to fix an issue resulting from that behavior.
However, that modification introduced a system resume regression on
Thinkpad X240, so make the EC driver switch over to the polling mode
during noirq stages of system suspend and resume again, which
effectively reverts the problematic commit.
Fixes: 662591461c4b (ACPI / EC: Drop EC noirq hooks to fix a regression)
Link: https://bugzilla.kernel.org/show_bug.cgi?id=197863
Reported-by: Markus Demleitner <[email protected]>
Tested-by: Markus Demleitner <[email protected]>
Signed-off-by: Rafael J. Wysocki <[email protected]>
Signed-off-by: Sasha Levin <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
Signed-off-by: Kamal Mostafa <[email protected]>
Signed-off-by: Khalid Elmously <[email protected]>
I was primarily interested in fixing this bug in the 4.15 Ubuntu Bionic kernel,
and have reverted the commit in the Ubuntu kernel, and cannot reproduce the
problem any longer.
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