On Mon, 7 Jun 2010, Zhang Rui wrote: > On Fri, 2010-06-04 at 22:52 +0800, Alan Stern wrote: > > On Fri, 4 Jun 2010, Zhang Rui wrote: > > > > > 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"? > > > > I don't have the laptop with me here, so this will have to wait a > > little. > > > okay. > > > Also, I've never used the backlight control and I don't know how it > > works. What should I do in order to test it? > > > You can change the backlight by poking /sys/class/backlight/*/brightness With acpi_backlight=vendor instead of acpi_osi="!Windows 2009", the backlight control still works. And those error messages do not appear in the system log. Which option should I use? Alan Stern -- 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
