Messages in this thread | | | From | "Rafael J. Wysocki" <> | Subject | Re: [Resend][PATCH] ACPI / PM: Do not power manage devices in unknown initial states | Date | Fri, 01 Feb 2013 22:44:55 +0100 |
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On Friday, February 01, 2013 07:23:52 PM Peter Wu wrote: > On Thursday 31 January 2013 23:32:40 Rafael J. Wysocki wrote: > > In general, for ACPI device power management to work, the initial > > power states of devices must be known (otherwise, we wouldn't be able > > to keep track of power resources, for example). Hence, if it is > > impossible to determine the initial ACPI power states of some > > devices, they can't be regarded as power-manageable using ACPI. > > > > For this reason, modify acpi_bus_get_power_flags() to clear the > > power_manageable flag if acpi_bus_init_power() fails and add some > > extra fallback code to acpi_bus_init_power() to cover broken > > BIOSes that provide _PS0/_PS3 without _PSC for some devices. > > > > Verified to work on my HP nx6325 that has this problem. > > > > Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com> > > Tested-by: Peter Wu <lekensteyn@gmail.com> > > I applied it on top of branch linux-next of repo linux-pm. > > Fixes the issue I had with bbswitch in Linux 3.8. Can a backport patch be made > available for 3.8?
Yes, after this commit enters the mainline. Please ping me some time around 3.9-rc1.
Thanks, Rafael
-- I speak only for myself. Rafael J. Wysocki, Intel Open Source Technology Center.
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