Bug 23192 - need to disable USB LPM on new macbook air
Summary: need to disable USB LPM on new macbook air
Status: RESOLVED DUPLICATE of bug 21182
Alias: None
Product: Drivers
Classification: Unclassified
Component: USB (show other bugs)
Hardware: All Linux
: P1 normal
Assignee: Greg Kroah-Hartman
URL:
Keywords:
Depends on:
Blocks:
 
Reported: 2010-11-18 10:44 UTC by Brian Tarricone
Modified: 2010-11-20 09:50 UTC (History)
0 users

See Also:
Kernel Version:
Subsystem:
Regression: No
Bisected commit-id:

Attachments
dmesg output during failure (13.64 KB, text/plain)
2010-11-18 10:44 UTC, Brian Tarricone 		Details
patch to disable LPM on nvidia MCP89 (1.04 KB, patch)
2010-11-18 10:45 UTC, Brian Tarricone 		Details | Diff
Add an attachment (proposed patch, testcase, etc.)

Description Brian Tarricone 2010-11-18 10:44:44 UTC 
Created attachment 37412 [details]
dmesg output during failure

I'm getting USB protocol errors when attaching devices (in my case USB flash drives and CDC ethernet devices).  I found that kernel .34 was working, but .37-rc2 was not.  Bisected to find that the commit that added LPM support (48f24970144479c29b8cee6d2e1dbedf6dcf9cfb) was at fault, so I disabled LPM and that did the trick.  Not sure if there's a better way to fix this than to just disable LPM outright; if you have any ideas to try I'd be happy to give it a look.  I'll attach dmesg log and the patch.
Comment 1 Brian Tarricone 2010-11-18 10:45:23 UTC 
Created attachment 37422 [details]
patch to disable LPM on nvidia MCP89
Comment 2 Brian Tarricone 2010-11-18 10:53:56 UTC 
Argh, it looks like my bugzilla search skills failed; #21182 seems to have beaten me to the punch.  Though the patch there looks incorrect: it disables LPM for the OHCI controller's PCI id (0x0d9c) and not the EHCI controller (0x0d9d).
Comment 3 Brian Tarricone 2010-11-20 09:50:43 UTC 

*** This bug has been marked as a duplicate of bug 21182 ***
Note You need to log in before you can comment on or make changes to this bug.