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SubjectRe: [PATCH v3 1/2] acpi: Add "acpi_osi=" for ASUS X200MA to enable, brightness keys
CC Jani, who is working on the patchset to enable 8+ output devices and
may have some comments on this.

Regards,
Aaron

On 12/18/2014 09:25 PM, Josh Boyer wrote:
> On Thu, Dec 18, 2014 at 7:16 AM, Dmitry Tunin <hanipouspilot@gmail.com> wrote:
>> Add "acpi_osi=" quirk for ASUS X200MA
>> More information can be found in UX302LA bugreport
>> https://bugzilla.kernel.org/show_bug.cgi?id=70241
>>
>> X200MA is affected by th e same bug and the solution has been tested
>>
>> I reported it to launchpad too
>> https://bugs.launchpad.net/ubuntu/bug/1400068
>>
>> Cc: stable@vger.kernel.org
>> Signed-off-by: Dmitry Tunin <hanipouspilot@gmail.com>
>>
>
> The UX301LA models have the same setup, with 16 devices instead of 8.
> I discussed this with Matthew Garrett a bit and a more ideal approach
> is to actually enumerate all 16 devices between the firmware and i915
> driver. The problem we have is that the intel opregion spec that
> hasn't been updated since 2008 doesn't cover the additional 8 devices.
> Anyway, that is being tracked here:
>
> https://bugs.freedesktop.org/show_bug.cgi?id=81762
>
>> ---
>> drivers/acpi/blacklist.c | 20 ++++++++++++++++++++
>> 1 file changed, 20 insertions(+)
>>
>> diff --git a/drivers/acpi/blacklist.c b/drivers/acpi/blacklist.c
>> index 7556e7c..f78ed08 100644
>> --- a/drivers/acpi/blacklist.c
>> +++ b/drivers/acpi/blacklist.c
>> @@ -162,6 +162,17 @@ static int __init dmi_disable_osi_win8(const struct
>> dmi_system_id *d)
>> acpi_osi_setup("!Windows 2012");
>> return 0;
>> }
>> +/*
>> + * Some ASUS models firmware declares 16 devices instead of 8
>> + * 'acpi_osi=' kernel parameter fixes it
>> + * Without this parameters brightness keys Fn+F5 and F6 do not work
>> + */
>> +static int __init dmi_disable_osi_all(const struct dmi_system_id *d)
>> +{
>> + printk(KERN_NOTICE PREFIX "DMI detected: %s\n", d->ident);
>> + acpi_osi_setup("");
>> + return 0;
>> +}
>
> What does this do to the rest of the function keys? Does everything
> else still work as expected, including suspend and resume?
>
>> static struct dmi_system_id acpi_osi_dmi_table[] __initdata = {
>> {
>> @@ -371,6 +382,15 @@ static struct dmi_system_id acpi_osi_dmi_table[]
>> __initdata = {
>> DMI_MATCH(DMI_PRODUCT_NAME, "1015PX"),
>> },
>> },
>> + /* Without this brightness keys do not work */
>> + {
>> + .callback = dmi_disable_osi_all,
>> + .ident = "ASUSTeK COMPUTER INC. X200MA",
>> + .matches = {
>> + DMI_MATCH(DMI_SYS_VENDOR, "ASUSTeK COMPUTER INC."),
>> + DMI_MATCH(DMI_PRODUCT_NAME, "X200MA"),
>> + },
>> + },
>> {}
>> };
>>
>> --
>> 1.9.1
>> --
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