Date: Fri, 30 Jan 2004 08:36:14 -0700 (MST) From: "M. Warner Losh" <imp@bsdimp.com> To: marks@ripe.net Cc: freebsd-acpi@jp.freebsd.org Subject: Re: API to turn off the display Message-ID: <20040130.083614.75932761.imp@bsdimp.com> In-Reply-To: <20040130092529.GA725@laptop.6bone.nl> References: <20040129162023.GA42359@laptop.6bone.nl> <200401291132.54455.jhb@FreeBSD.org> <20040130092529.GA725@laptop.6bone.nl>
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In message: <20040130092529.GA725@laptop.6bone.nl>
Mark Santcroos <marks@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.
Warner
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