Hello, I have an HP tx2500 with some bezel buttons that are not working. HP tabletPC's are notorious for this. I have discovered why they are not working (hp-wmi is not getting the notification to query them) and I have managed to insert some code into the DSDT that will cause hp-wmi to successfully read these keys when the lid is closed. I have inserted this same code into every _Q?? method from 01-8F, including those previously undefined, but no dice. I have also extracted the DSDT from Windows Vista, decompiled it, compared it to the one I extracted from Linux (several small differences), recompiled it and ran it. That didn't get it done either. So basically, this is a BIOS problem that Windows works around. I do not know enough about the hardware/BIOS to determine whether or not this is something that can still be fixed in the DSDT, or something that would have to be fixed in the kernel. For a BIOS fix, I suspect the Embedded Controller needs to be programmed in some way, along with a modified dsdt. For a kernel fix, I suspect Windows either polls the WMI query, programs the EC every boot, or gets the signal some other way (e.g. PNP0C09). A brief description of how these hotkeys operate: The EmbeddedController, PNP0C09, houses the internal button register, QBBB, that stores the internal key code. When hp-wmi, PNP0C14, performs the query, QBBB is tested for the button pressed and the appropriate scancode is wrote to the memory location that is subsequently read. I have what I believe to be an accurate MB schematic, which indicates that the embedded controller is from ENE, chip KB3926, and I have found data sheets for similar EC's. This is something that I work on in my spare time, so I would be grateful if someone could share some knowledge on the subject, or kindly point me to someone who might be able to help. Thanks, Kyle -- 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
