Date: Tue, 2 Mar 2004 11:48:13 -0800 (PST) From: Nate Lawson <nate@root.org> To: "Grover, Andrew" <andrew.grover@intel.com> Cc: current@freebsd.org Subject: RE: [acpi-jp 3093] Re: Update on ACPI with FreeBSD CURRENT on ThinkPad T30 Message-ID: <20040302114344.N12977@root.org> In-Reply-To: <F760B14C9561B941B89469F59BA3A8470255F036@orsmsx401.jf.intel.com> References: <F760B14C9561B941B89469F59BA3A8470255F036@orsmsx401.jf.intel.com>
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On Tue, 2 Mar 2004, Grover, Andrew wrote: > > From: owner-acpi-jp@jp.FreeBSD.org > > [mailto:owner-acpi-jp@jp.FreeBSD.org] On Behalf Of Randy Bush > > > Try using the sysctls from the new acpi_video module to turn off the > > > backlight, perhaps by turning the brightness way down. > > > > i am on a t40p and have tried a lot of this to no avail. > > My understanding is that actually turning off the backlight is not done > via _BCM. But, I still don't know exactly how it *is* done. _PS3 might > do it, but some people have hinted that this is something that the video > driver is supposed to know how to do. I believe you're correct. On others, the _PSx methods do control backlight. However, for this platform most is done through SMI so I'm not sure. -Nate
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