Arch Linux

gh403

Member

Registered: 2012-09-15

Posts: 23

[SOLVED] No USB after Resume from Suspend

I've got Arch on my Dell Inspiron 7520.  When I boot the system, USB works as advertised.  If I suspend & resume while the computer is plugged into AC power, USB still works as advertised.  But if I disconnect the AC power and suspend & resume, USB devices stop being detected at all:  lsusb shows no difference when plugging any device in (and of course KDE doesn't see new flash drives).  Laptop-mode-tools is disabled (even though I'm burning around 20W!), as I thought USB autosuspend might be a culprit; I am using acpid and pm-utils though.

What could the problem be?  This is driving me insane!

Last edited by gh403 (2013-10-25 19:44:36)

jasonwryan

Anarchist

From: .nz

Registered: 2009-05-09

Posts: 30,424

Website

Re: [SOLVED] No USB after Resume from Suspend

Do a `lsmod` before and after suspending.

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Arch + dwm   •   Mercurial repos  •   Surfraw

Registered Linux User #482438

labotsirc

Member

Registered: 2013-08-21

Posts: 108

Re: [SOLVED] No USB after Resume from Suspend

are you running a custom kernel?

gh403

Member

Registered: 2012-09-15

Posts: 23

Re: [SOLVED] No USB after Resume from Suspend

Hey, thanks for your replies.  I just found time to answer your questions; my apologies for the delay.

jasonwryan, here you go.  There are only a couple lines different; in any case, nothing is loaded/unloaded.
before: http://ix.io/8or
after: http://ix.io/8os

labotsirc, nope, totally official.  If you're interested:

# pacman -Q linux
linux 3.11.4-1

EDIT:  Another interesting behavior I just noticed is that this problem doesn't happen if something (in my case a USB/Serial converter) is plugged into a USB port when doing the suspend/resume.

Last edited by gh403 (2013-10-09 07:23:17)

gh403

Member

Registered: 2012-09-15

Posts: 23

Re: [SOLVED] No USB after Resume from Suspend

Solved.  At some point I must have switched off USB wakeup in the BIOS.  This wasn't a Linux issue at all!

Read #14 on https://bugs.launchpad.net/ubuntu/+sour … ug/1094534.