The following is, I think, a bug in ACPICA (so CC'ing Robert Moore). (The full DSDT for the laptop in question (Acer Aspire 5040) is available here - I'm just going to selectively quote from it in this e-mail: http://aceracpi.googlecode.com/svn/trunk/dsdt/acer/aspire/5040.dsl ) ACPI is choking on the second of two OperationRegion's in different parts of the DSDT, with the same name, and that both operate on the Embedded Controller. This hasn't cropped up before on the laptop in question (an Acer Aspire 5040 - based on the DSDTs I've collected so far for Acer laptops, I suspect a few others will have the same problem), as the second OperationRegion, in this case, is found in \_SB.AMW0 (aka WMI-ACPI or PNP0C14); and in acer_acpi, I've only just started poking at this (the first time by accident, the second time by more closely studying the DSDT - unfortunately, I don't have the hardware in question). So, on the DSDT in question, we are trying to call \_SB.AMW0.WMCA In ACPI land, it takes three arguments: 1) Instance (ACPI_TYPE_INTEGER) 2) Method ID (ACPI_TYPE_INTEGER) 3) Buffer (u32 in this case) When we call it (we already know what the correct values to pass are, both from reverse engineering, and from visual inspection of the DSDT), we always get the following result (this is from a user with a 2.6.22 kernel): [ 699.477048] ACPI Error (evregion-0316): No handler for Region [RAM_] (ffff8100012b7ac0) [EmbeddedControl] [20070126] [ 699.477055] ACPI Error (exfldio-0289): Region EmbeddedControl(3) has no handler [20070126] [ 699.477060] ACPI Exception (dswexec-0462): AE_NOT_EXIST, While resolving operands for [OpcodeName unavailable] [20070126] [ 699.477066] ACPI Error (psparse-0551): Method parse/execution failed [\_SB_.AMW0.WMCA] (Node ffff810035e55400), AE_NOT_EXIST The part of the DSDT we appear to be choking on is in \_SB.AMW0 (_HID PNP0C14): OperationRegion (RAM, EmbeddedControl, 0x00, 0xFF) (Followed by lots of Field() bits, which depend on the region RAM being defined). Of course, in \_SB.PCI0.LPC0.EC0 (PNP0C09) we have exactly the same line, which works just fine: OperationRegion (RAM, EmbeddedControl, 0x00, 0xFF) So, I suspect either: 1) ACPICA does not handle EmbeddedControl outside of PNP0C09 (or, at least, can't handle it properly in PNP0C14, or in this case, *pnp0c14) or 2) ACPICA is having a namespace clash with two identically named regions both trying to access EmbeddedControl? (But given that EC0 works fine, I'm not sure how likely this is). Of course, if this bug is already known and has been fixed in something newer than 2.6.22, please let me know - I don't have the hardware in question, so cannot confirm this myself. -Carlos -- E-Mail: carlos@xxxxxxxxxxxxxxxxxxx Web: strangeworlds.co.uk GPG Key ID: 0x23EE722D - To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
