On Wed, Feb 29, 2012 at 1:50 PM, Seth Forshee <seth.forshee@xxxxxxxxxxxxx> wrote: > On Wed, Feb 29, 2012 at 12:43:23PM -0600, Grant Likely wrote: >> On Wed, Feb 29, 2012 at 11:53 AM, Seth Forshee >> <seth.forshee@xxxxxxxxxxxxx> wrote: >> > On Wed, Feb 29, 2012 at 11:46:39AM -0600, Grant Likely wrote: >> >> On Wed, Feb 22, 2012 at 8:37 AM, Seth Forshee >> >> <seth.forshee@xxxxxxxxxxxxx> wrote: >> >> > Apple laptops with hybrid graphics have a device named gmux that >> >> > controls the muxing of the LVDS panel between the GPUs as well as screen >> >> > brightness. This driver adds support for the gmux device. Only backlight >> >> > control is supported initially. >> >> > >> >> > Signed-off-by: Seth Forshee <seth.forshee@xxxxxxxxxxxxx> >> >> >> >> Works for me. >> >> >> >> Tested-by: Grant Likely <grant.likely@xxxxxxxxxxxx> >> >> >> >> Now I just need to figure out how to get the desktop backlight widget >> >> to use gmux_backlight instead of acpi_video0... >> > >> > The easy way is to pass acpi_backlight=vendor to the kernel, then you >> > won't have acpi_vidoe0. >> >> That did it, thanks. I'm assume something is in the works to set it >> up automatically? > > Not that I'm aware of. A number machines have this problem, that the > standard ACPI backlight interfaces are implemented but don't work. This > generally isn't detectable in software; with the Apples at least > everything looks like it's working except that the brightness doesn't > change (but not all Apple laptops are affected, so qurking based on > manufacturer wouldn't work). All we're left with is DMI quirking, which > isn't practical. Maybe we could add something so a platform driver can > tell acpi_video that it knows the ACPI backlight doesn't work, but I > think on some platforms that still is going to be based off of DMI > information. blacklisting based on specific product name (ie. MacBookPro8,*) or machine model is probably the best. It wouldn't be the first blacklist in the linux kernel. g. -- 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
