https://bugzilla.kernel.org/show_bug.cgi?id=91341
Bug ID: 91341
Summary: Optimus laptop: Fail to evaluate _DSM due to type
mismatch on argument #4
Product: ACPI
Version: 2.5
Kernel Version: -> 3.19-rc4
Hardware: All
OS: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: Config-Tables
Assignee: acpi_config-tab...@kernel-bugs.osdl.org
Reporter: pierre.mor...@free.fr
Regression: No
Created attachment 163521
--> https://bugzilla.kernel.org/attachment.cgi?id=163521&action=edit
dmesg with ACPI_DEBUG=y, drm.debug=0x3
Hardware: MacBook Pro 5,3 mid 2009 with two GPUs (9400M and 9600M GT), optimus
laptop
When Nouveau tries to determine whether the laptop is optimus compatible or
not, it receives a NULL object resulting in the `ACPI: \_SB_.PCI0.RP01.GFX0:
failed to evaluate _DSM` message. Prior to that acpi emits `ACPI Warning:
\_SB_.PCI0.RP01.GFX0._DSM: Argument #4 type mismatch - Found [Buffer], ACPI
requires [Package] (20141107/nsarguments-95)`.
I had a look at the `acpi_evaluate_dsm` function which is (indirectly) called
by Nouveau, and its documentation does say that argument #4 should be an
ACPI_TYPE_PACKAGE, but that "some old BIOSes do expect a buffer". The function
takes a pointer to an acpi_object in order to allow callers to specify which
type argument #4 should be. Nouveau does specify it should be an
ACPI_TYPE_BUFFER, but the preceding warning is still emited, and
`acpi_evaluate_dsm` returns an ACPI_TYPE_INTEGER rather than the expected
ACPI_TYPE_BUFFER.
This error has been there for some time, but I can't recall if it is a
regression or if it was already there when I started using Linux on this
laptop.
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