[Bugme-new] [Bug 32602] New: nouveau_acpi/intel_acpi call _DSM with wrong parameter
bugzilla-daemon at bugzilla.kernel.org
bugzilla-daemon at bugzilla.kernel.org
Sun Apr 3 20:37:32 PDT 2011
https://bugzilla.kernel.org/show_bug.cgi?id=32602
Summary: nouveau_acpi/intel_acpi call _DSM with wrong parameter
Product: Drivers
Version: 2.5
Kernel Version: 2.6.38
Platform: All
OS/Version: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: Video(Other)
AssignedTo: drivers_video-other at kernel-bugs.osdl.org
ReportedBy: alex.williamson at redhat.com
Regression: No
Both drivers/gpu/drm/i915/intel_acpi.c and
drivers/gpu/drm/nouveau/nouveau_acpi.c call _DSM methods with parameters of
_DSM(Buffer, Integer, Integer, Integer). The ACPI spec defines the parameters
to be _DSM(Buffer, Integer, Integer, Package). On a UL30VT, the AML preforms
operations on Arg3 which are not valid for an Integer data type, resulting in
ACPI faults. Excerpt of DSDT:
Method (_DSM, 4, NotSerialized)
{
If (LEqual (Arg0, Buffer (0x10)
{
/* 0000 */ 0xA0, 0xA0, 0x95, 0x9D, 0x60, 0x00, 0x48, 0x4D,
/* 0008 */ 0xB3, 0x4D, 0x7E, 0x5F, 0xEA, 0x12, 0x9F, 0xD4
}))
{
Store (Zero, Local0)
Store (ShiftLeft (DerefOf (Index (Arg3, 0x03)), 0x18), Local0)
Add (ShiftLeft (DerefOf (Index (Arg3, 0x02)), 0x10), Local0, Local0)
Add (ShiftLeft (DerefOf (Index (Arg3, One)), 0x08), Local0, Local0)
Add (ShiftLeft (DerefOf (Index (Arg3, Zero)), Zero), Local0, Local0)
...
The Index operation is only valid on a Buffer, String, or Package, which is
perfectly reasonable given the definition of the _DSM call.
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