Created attachment 100622 [details] ACPI tables and kern.log Dunno if I am right here ... Ilja Mirkin from the nouveau mailing list sent me here. Also English is not my native language, so please cut me some slack. In order to trace a machine hangup I contacted the nouveau guys. Mirkin told me to file a bug here because when the kernel executes _DSM, it throws off two warnings: Jun 6 21:56:21 asgard kernel: [ 1.966614] ACPI Warning: \_SB_.PCI0.PEG0.PEGP._DSM: Argument #4 type mismatch - Found [Buffer], ACPI requires [Package] (20140214/nsarguments-95) Jun 6 21:56:21 asgard kernel: [ 1.966657] ACPI Warning: \_SB_.PCI0.PEG0.PEGP._DSM: Argument #4 type mismatch - Found [Buffer], ACPI requires [Package] (20140214/nsarguments-95) I am using the 3.15-rc8 kernel and can reproduce the warning with each boot. Attached is my complete kern.log and my extracted ACPI tables. I will provide you with additional informations if you need them, just let me know.
The warning can be safely ignored. Some ACPI firmware expect the non-standard Buffer type and fail if you pass a Package type. Hence nouveau always passes a Buffer which is against the ACPI standard, which triggers this unavoidable warning.
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