https://bugzilla.kernel.org/show_bug.cgi?id=42696
Summary: Wrong ACPI handle is being detected for NVIDIA
graphics card on Lenovo Ideapad Y470/Y570
Product: ACPI
Version: 2.5
Kernel Version: 3.3-rc1
Platform: All
OS/Version: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: BIOS
AssignedTo: [email protected]
ReportedBy: [email protected]
Regression: No
On the Lenovo Ideapad Y470 and Lenovo Ideapad Y570, the kernel assigns the
\_SB.PCI0.PEG0.VGA handle to the PCI device (possibly because the _DOS method
is found on the handle?)
However, the correct _DSM, _ROM, _PS0 and _PS3 can be found on the
\_SB.PCI0.PEG0.PEGP handle. _PSx on the VGA handle is basically a no-op, it
only gets/sets the _PSC variable. _ROM does not exist and the _DSM method is
not useful comparing it to the PEGP._DSM method.
Due to this issue, the nouveau driver fails to load the vbios (because _ROM
does not exist on VGA). Similarly, the proprietary nvidia driver fails to load.
As for the _PS0 and _PS0 methods, using the pci_set_power_state methods does
not really disable the PCI device.
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