From: Rafael J. Wysocki:

On Friday, April 13, 2012, Mikko Vinni wrote:

quoted

 Bug report:
    https://bugzilla.kernel.org/show_bug.cgi?id=43099

 Briefly:

 After s2ram the touchpad on a HP dv5 laptop doesn't work anymore.

 dmesg contains this about the touchpad
 Apr 11 18:00:05 koni kernel: i8042: Can't write CTR while closing AUX 

port

quoted

 Apr 11 18:00:08 koni kernel: i8042: Can't reactivate AUX port


 Full log in bugzilla with PCI and i8042 debug turned on.

 Bisected to:

 commit 26f41062f28de65e11d3cf353e52d0be73442be1
 Author: Kay, Allen M [off-list ref]
 Date:   Thu Jan 26 10:25:53 2012 -0800

     PCI: check for pci bar restore completion and retry
    
     On some OEM systems, pci_restore_state() is called while FLR has not 

yet

quoted

     completed.  As a result, PCI BAR register restore is not successful.  

This fix

quoted

     reads back the restored value and compares it with saved value and 

re-tries 10

quoted

     times before giving up.

Does reverting the above commit on top of the current Linus' tree fix the
problem for you?

It does (at least with the tree from yesterday, 4166fb64593514ad920b7dbd290e0a934b37d24a).


Mikko

Rafael

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