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  1. Bug #1429489
  2. Comment #0

Comment 0 for bug 1429489

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Pirouette Cacahuète (lissyx) wrote : Suspend not working when closing lid on ThinkPad T420s

As documented in bug 1427942: I do reproduce this on a ThinkPad T420s. Previous version installed (14.04) did work pretty well for this.

dmesg when closing/opening with kernel "Linux alex-ThinkPad-T420s 3.19.0-7-generic #7-Ubuntu SMP Thu Feb 26 20:19:34 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux":
[ 94.842668] systemd-logind[1262]: Lid closed.
[ 102.468204] systemd-logind[1262]: Lid opened.
[ 102.468661] i915 0000:00:02.0: BAR 6: [??? 0x00000000 flags 0x2] has bogus alignment
[ 124.075694] systemd-logind[1262]: Removed session c1.

The i915 seems to be unrelated: it appears after the lid is opened again, and "pci=noacpi" makes it disappear but the bug stays.

Kernel 4.0 do not help.

There is no issue with a 14.10 ; and upgrading 14.10 to 15.04 exposes the issue.

I managed to got it to work, after playing with the e1000e driver as suggested on https://bbs.archlinux.org/viewtopic.php?pid=1414261#p1414261

The current state is:
 - doing nothing, e1000e loaded, it never goes to suspend when I close the lid (tried 5 times)
 - removing e1000e, goes to suspend when I close the lid
 - doing nothing, e1000e removed, it again cannot go to suspend when I close the lid
 - loading e1000e, goes to suspend when I close the lid

And of course, manually suspending does work.