On Mon, Mar 12, 2012 at 03:22:24PM +0000, Matthew Garrett wrote: > On Mon, Mar 12, 2012 at 10:18:52AM -0500, Seth Forshee wrote: > > > Why do you presume it works under Windows? Boot camp installs a pile of > > drivers for Windows, one of those could be a driver for the backlight. I > > don't know either way. But it's pretty clear that MacOS is using the > > gmux for the backlight when it is present from the reverse engineering > > work done by others. > > The only reason to provide it at all is for Windows - it's never going > to be used under OS X. I'm not so sure. The MacBook Pro 8,1 and 8,2 seem to use the same BIOS implementation -- the version numbers and DSDTs are identical. The 8,1 has only Intel graphics, no gmux, and a working acpi_video0 backlight under Linux. The 8,2 has hybrid ATI/Intel, a gmux w/ working backlight control, and acpi_video0 does not work. So while I'm not sure, I can't rule out that the acpi_video backlight might be provided specifically for the 8,1 and that OS X is using it. Unfortunately I don't have an 8,1 that I can play with to try and work it out. Seth -- To unsubscribe from this list: send the line "unsubscribe platform-driver-x86" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
