Ubuntu
linux-meta-lts-utopic package

  1. Bug #1419355
  2. Comment #12

Comment 12 for bug 1419355

Revision history for this message
In , tiwai (tiwai-linux-kernel-bugs) wrote :

It's difficult to judge only from this information...

You can try to unload xhci_hcd module first, then halt. This should behave same as normal shutdown, because the driver puts to D3 at its removal, too.

If module unload behaves same, then you can try to forcibly set the device to D0 at the next step.

After unloading xhci_hcd module, adjust the power state via setpci. For example, suppose that XHCI PCI entry is 00:14.0, the following command (run as root)

    setpci -s 00:14.0 CAP_PM+4.b

shows the current value. The bit 0 & 1 correspond to the power state, (0 = D0, 3 = D3). Suppose this value being 0b, it means D3. For changing this to D0, run like:

    setpci -s 00:14.0 CAP_PM+4.b=08

You can see the current state via lspci -s 00:14.0 -s, too.

After changing to D0, try to halt the machine again to see whether the above changes the power off behavior.