On 0618T0947, John Baldwin wrote:
> On Monday, June 16, 2014 3:21:55 pm Edward Tomasz Napierała wrote:
> > Hi.  Patch below should fix a problem where USB stops working after
> > _second_ suspend/resume, which happens on various ThinkPad models.
> > Please test, and report both success stories and failures.  If nothing
> > comes up, I'll commit it in a week or so.
> Good find.  Have you thought about a more generic fix for this wherein you 
> track power resources and flip them on during resume in ACPI before doing
> DEVICE_RESUME() on the root bus?

Thing is, after resume this device claims to be on already.  The following
simple hack was enough to make it work:

Index: sys/dev/acpica/acpi_powerres.c
--- sys/dev/acpica/acpi_powerres.c      (revision 267417)
+++ sys/dev/acpica/acpi_powerres.c      (working copy)
@@ -653,7 +653,7 @@ acpi_pwr_switch_power(void)
         * effort; we don't know what to do if it fails, so checking wouldn't
         * help much.
-       if (rp->ap_state != ACPI_PWR_ON) {
+       if (rp->ap_state != ACPI_PWR_ON || 1) {
            status = AcpiEvaluateObject(rp->ap_resource, "_ON", NULL, NULL);
            if (ACPI_FAILURE(status)) {

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