On Thu, 2010-06-03 at 22:16 +0800, Matthew Garrett wrote: > On Thu, Jun 03, 2010 at 09:10:06AM +0800, Zhang Rui wrote: > > > This is a BIOS bug to me. The code runs in this way: > > > > if (not Win7) > > good BIOS code > > else > > buggy BIOS code > > > > This is a regression because ACPI declares it's win7 compatible in > > 2.6.31. I'm afraid we can do nothing in Linux kernel to fix/workaround > > it. IMO, we should ping Asus to fix it in their new BIOS release. > > So if you install Windows 7 on these machines, backlight control doesn't > work? > I've heard that win7 prefers the ACPI wmi driver instead of ACPI video driver for backlight control. But not sure if win7 prefers the platform driver as well. Alan, can you help me verify if the backlight control works well when you boot w/ acpi_backlight=vendor and w/o acpi_osi="!Windwos 2009"? thanks, rui -- To unsubscribe from this list: send the line "unsubscribe linux-acpi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
