API to turn off the display

M. Warner Losh imp at bsdimp.com
Fri Jan 30 07:36:40 PST 2004

In message: <20040130092529.GA725 at laptop.6bone.nl>
            Mark Santcroos <marks at ripe.net> writes:
: On Thu, Jan 29, 2004 at 11:32:54AM -0500, John Baldwin wrote:
: > I read the spec yesterday, and what is supposed to happen is this:  The 
: > display (LCD, CRT, etc.) is supposed to be powered down using DPMS.  The 
: > actual adapter is then supposed to be powered down using either PCI or ACPI 
: > sleep states, and the adapter should not be powered down to a lower sleep 
: > state (like D3) w/o using DPMS to power the display down to at least that 
: > state first.  This means that the kernel might need to grow a dummy vga 
: > driver of some sort and some simple dpms support for suspend/resume.
: I second this.
: Nate, can you put it on your acpi-todo list?

The only problem with having a vga device for suspend/resume is that
it will claim devices that drm wants to claim later and X won't work.

I have about the simplest driver possible for vga in one of my trees,
and found this to be a problem on my dell i8k.


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