[ltp] Thinkpad 600E: How to disable LCD off switch

[Alex Deucher]

On 6/14/05, Terry Barnaby <terry1@beam.ltd.uk> wrote:
> Charles E Taylor IV wrote:
> > On Tue, 14 Jun 2005 18:42:28 +0100
> > Terry Barnaby <terry1@beam.ltd.uk> wrote:
> >
> >
> >>Or perhaps re-enabling the external VGA when the LCD off switch
> >>operates ?
> >
> >
> > Are you trying to control it with the keyboard or IR/mouse?  If you're =
not
> > using the keyboard, what about just booting it closed and with the moni=
tor
> > connected?
> >
>=20
> I didn't actualy think of seeing what it would do when booted with the
> LCD closed :)
> Well it does boot with just the external monitor working but when
> X-Windows starts both the monitor an LCD screen come on .....
>=20
> However, I have just tried using ACPI rather than APM by setting
> the kernel parameters "acpi=3Dforce pci=3Dnoacpi" on my Fedora 3
> system with kernel 2.6.11-1.27_FC3. With this the system boots,
> PCMCI EThernet works and the screen seems to work Ok. That is if
> I boot with the lid closed the LCD panel remains off. Also if
> I boot with LCD panel open and use the keyboards Fn-F7 key to
> set only the external monitor, then the monitor remains on when
> the panel is closed.
>=20
> So I think I have a solution, as long as enabling the ACPI on a 600E
> does not cause other problems ...
> Does anyone have any info on using ACPI with the Thinkpad 600E ?
>=20
> I will be controlling the 600E via the external monitors touch screen
> interface by the way.
>=20
> Thanks all for the info.
>=20
> Cheers
>=20
> Terry

if it works, it generally works.  The cut off was put in place since
many early ACPI implementations didn't work properly.  All old laptops
I've tried haven't had a problem, but YMMV...

Alex