[Bug 61891] Cannot switch off Radeon 6400M with vgaswitcheroo

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=61891

Rafael J. Wysocki <rjw at rjwysocki.net> changed:

           What    |Removed                     |Added
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                 CC|                            |rjw at rjwysocki.net

--- Comment #15 from Rafael J. Wysocki <rjw at rjwysocki.net> ---
Yes, this most likely is related to PCI hotplug, because ACPIPHP now handles
devices it didn't try to handle before.  This means that if there are ACPI
hotplug events for those devices, it will try to handle them.

What happens is probably that there is a bus check or device check causing
ACPIPHP to rescan the bus and during that bus rescan it finds a device that
doesn't respond (no wonder), so it decides that the device has gone and tries
to remove it.

The solution might be to tell ACPIPHP somehow that the device in question
didn't really go away.  Or to ignore that device entirely.

I guess we may use a flag in struct acpi_device set for the graphics adapter's
ACPI companion by the radeon driver during probe.  Or something like that.

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