[Bug 560464] Re: "acer-wmi: Unable to detect available WMID devices" on boot

[Markhor]

I use Xubuntu 10.04 RTM on Aspire One AOD250 and get the same message. Here is what I think of this bug.
According to the latest Ubuntu kernel source, "Unable to detect available WMID devices" error message is printk-ed at drivers/platform/x86/acer-wmi.c line 1293. Here is the complete code:

       printk(ACER_INFO "Acer Laptop ACPI-WMI Extras\n");

	if (dmi_check_system(acer_blacklist)) {
		printk(ACER_INFO "Blacklisted hardware detected - "
				"not loading\n");
		return -ENODEV;
	}

        find_quirks();

	/*
	 * Detect which ACPI-WMI interface we're using.
	 */
	if (wmi_has_guid(AMW0_GUID1) && wmi_has_guid(WMID_GUID1))
		interface = &AMW0_V2_interface;

	if (!wmi_has_guid(AMW0_GUID1) && wmi_has_guid(WMID_GUID1))
		interface = &wmid_interface;

	if (wmi_has_guid(WMID_GUID2) && interface) {
		if (ACPI_FAILURE(WMID_set_capabilities())) {
			printk(ACER_ERR "Unable to detect available WMID "
					"devices\n");
			return -ENODEV;
		}
	} else if (!wmi_has_guid(WMID_GUID2) && interface) {
		printk(ACER_ERR "No WMID device detection method found\n");
		return -ENODEV;
	}

What is interesting here is acer_blacklist. In detail, on line 229:

/* The Aspire One has a dummy ACPI-WMI interface - disable it */
static struct dmi_system_id __devinitdata acer_blacklist[] = {
	{
		.ident = "Acer Aspire One (SSD)",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
			DMI_MATCH(DMI_PRODUCT_NAME, "AOA110"),
		},
	},
	{
		.ident = "Acer Aspire One (HDD)",
		.matches = {
			DMI_MATCH(DMI_SYS_VENDOR, "Acer"),
			DMI_MATCH(DMI_PRODUCT_NAME, "AOA150"),
		},
	},
	{}
};

So I guess we should just add AOD250 model to this list. I will try to
do this myself, but it is the first time I compile a kernel module,
don't rely on me.

-- 
"acer-wmi: Unable to detect available WMID devices" on boot
https://bugs.launchpad.net/bugs/560464
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