[Intel-gfx] RFC] [Patch] [DRM/I915] :Check the LID device to decide whether the LVDS should be initialized

[yakui_zhao]

On Sat, 2009-06-13 at 13:48 +0800, Alexander E. Patrakov wrote:
> 2009/6/11 yakui_zhao <yakui.zhao at intel.com>:
> > +       if (acpi_disabled) {
> > +               /*
> > +                * if ACPI is disabled, there is no ACPI device tree. And
> > +                * we don't know whether there exists the LID device.
> > +                * In such case we will return 0.
> > +                */
> > +               return 0;
> > +       }
> 
> Won't this prevent people from debugging ACPI problems on laptops by
> disabling ACPI on the kernel command line? Does this patch mean that,
> in such case, there will be no output at all? Maybe, without ACPI, we
> should initialize LVDS if and only if there are no other output
> devices connected?
No. It has no effect on LVDS output device if ACPI is disabled.
If the system is booted with acpi disabled, the function of intel_lvds_find_lid
will return zero and it will continue the current flowchart of LVDS output device.

Thanks.