Messages in this thread | | | Date | Sat, 08 Sep 2012 17:01:28 -0500 | From | Larry Finger <> | Subject | Re: Question about failure in PCI power-state change |
| |
On 09/08/2012 04:50 PM, Alan Stern wrote: > On Sat, 8 Sep 2012, Rafael J. Wysocki wrote: > >> On Saturday, September 08, 2012, Bjorn Helgaas wrote: >>> +cc Rafael, Huang, linux-pm >>> >>> On Fri, Sep 7, 2012 at 3:44 PM, Larry Finger <Larry.Finger@lwfinger.net> wrote: >>>> Hi, >>>> >>>> On occasion when I unload and reload driver rtl8192ce, I get the message >>>> >>>> "Refused to change power state, currently in D3" >>>> >>>> I added additional info to the printk and discovered that it was trying to >>>> change to state D0. The problem seems to occur when I have made a >>>> connection, unloaded the driver, and reloaded it. If I do not make a >>>> connection before unloading, then the problem is a lot less likely. >>>> >>>> This is with kernel 3.6-rc4 from wireless-testing. A Google search shows >>>> that the problem is usually due to suspend/resume difficulties, but this >>>> machine has not been suspended. >>>> >>>> I would appreciate any help that you might give in solving this issue. >> >> I think writing "on" to the /sys/devices/.../power/control attribute of the device >> in question would help. > > Are you suggesting that this particular wireless adapter is unable to > return to D0 from D3? > > Larry, what happens if you try the suspend & resume your system while > there's a connection? Does a similar error occur during the resume?
After I sent this request, I found an error in the removal process for this particular adapter, which I suspect is the real source of the problem. That difficulty is only found on the new variant of the card - the older one is OK. I think the problem is that the adapter is left in some ill-defined state that can only be cleared by doing a power reset. In that state, it is unable to return to D0.
This box has never been able to suspend/resume, thus I cannot answer the other question.
Thanks to all that responded. Once I clean up the other error, I will recontact the list if the D3 => D0 problem persists.
Larry
| |