Re: [PATCH] ACPI: Disable Windows 8 compatibility for some Lenovo ThinkPads

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On Mon, Feb 11, 2013 at 01:06:17PM -0600, Seth Forshee wrote:
> On Mon, Feb 11, 2013 at 05:52:13PM +0000, Matthew Garrett wrote:
> > So the problem is that userspace is writing values that don't happen to 
> > be aligned with the values the hardware reacts to, and so nothing gets 
> > changed?
> 
> Yes. The values are valid according to to _BCL, but _BCM is discarding
> any values that aren't contained in an array named BRTW. BRTW is
> literally the object returned by _BCL returns for !Windows 2012. Here's
> a link to the AML if you'd like to take a look.

Right. My concern here is that Windows clearly doesn't trigger the 
issue, and so there's some chance that we'll see similar issues on other 
machines. Disabling Windows 8 compatibility isn't really an option. One 
choice might be to have the ACPI video driver set all intermediate 
values if the system makes the Windows 8 OSI call?

-- 
Matthew Garrett | mjg59@xxxxxxxxxxxxx
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