Re: [PATCH v3 1/2] acpi: Add "acpi_osi=" for ASUS X200MA to enable, brightness keys

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But at least two devices work well with this quirk.
That must be some ASUS UEFI firmware fault, but still it is a workaround.
You can find some more information in those bugzilla reports.

https://bugzilla.kernel.org/show_bug.cgi?id=89401
https://bugzilla.kernel.org/show_bug.cgi?id=70241

18.12.2014 17:36, Matthew Garrett пишет:
That's odd - it looks like the default behaviour in the absence of any
OSI strings is to just default to an OSYS value that matches Windows
2012, so disabling the 2013 value should be equivalent. If it's not,
it's definitely not safe to turn off all values - there are several
devices that change behaviour as a result.

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