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4e6

Member

From: Russia, Moscow

Registered: 2011-01-25

Posts: 4

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[SOLVED] 2.6.38 broke retaining usb power on suspend

I used an acpitool to avoid powering down usb ports of my ThinkPad laptop on suspend. I was discovered it from ubuntuforums thread and it worked fine until recent kernel upgrade to 2.6.38.
acpitool -w output doesn't changed.

$ acpitool -w
   Device    S-state      Status   Sysfs node
  ---------------------------------------
  1. LID       S3        *enabled   
  2. SLPB      S3        *enabled   
  3. IGBE      S4        *enabled   pci:0000:00:19.0
  4. EXP0      S4        *disabled  pci:0000:00:1c.0
  5. EXP1      S4        *disabled  pci:0000:00:1c.1
  6. EXP2      S4        *disabled  
  7. EXP3      S4        *disabled  pci:0000:00:1c.3
  8. EXP4      S4        *disabled  pci:0000:00:1c.4
  9. PCI1      S4        *disabled  pci:0000:00:1e.0
  10. USB0     S3        *enabled   pci:0000:00:1d.0
  11. USB3     S3        *enabled   pci:0000:00:1a.0
  12. USB5     S3        *enabled   pci:0000:00:1a.2
  13. EHC0     S3        *disabled  pci:0000:00:1d.7
  14. EHC1     S3        *disabled  pci:0000:00:1a.7
  15. HDEF     S4        *disabled  pci:0000:00:1b.0

How can I fix it?

Last edited by 4e6 (2011-07-04 10:38:12)

pyther

Member

Registered: 2008-01-21

Posts: 1,395

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Re: [SOLVED] 2.6.38 broke retaining usb power on suspend

Sounds like a kernel bug. I would search for bugs upstream. If you can't find anything you could open a new bug (upstream). However, I would highly recommend doing a git bisect to figure out what commit broke this functionality.

This is a good guide on how to use git bisect to determine the bad commit: http://www.reactivated.net/weblog/archi … l-patches/

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4e6

Member

From: Russia, Moscow

Registered: 2011-01-25

Posts: 4

Website

Re: [SOLVED] 2.6.38 broke retaining usb power on suspend

pyther, thanks for suggestion. I've build 2.6.37 kernel from git sources but nothing changed, so i think problem is not in kernel. Also I've played a bit with acpitool and found that usb stayes powered with EHC0 enabled but laptop wakes up when usb device connects/disconnects (but it is right behaviour, I think) and with EHC1 enabed it wakes up immediatly after suspend.

4e6

Member

From: Russia, Moscow

Registered: 2011-01-25

Posts: 4

Website

Re: [SOLVED] 2.6.38 broke retaining usb power on suspend

The problem is solved. Recently I've bought ssd and installed new system on it. From now everything works fine again.