In message: <200401301306.57986.jhb_at_FreeBSD.org> John Baldwin <jhb_at_FreeBSD.org> writes: : On Friday 30 January 2004 10:36 am, M. Warner Losh wrote: : > 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. : : Yes, we need a way I think to have multiple drivers attach to a device, or : maybe have the drm drivers attach as a child of the vga device instead. For : the intel motherboards with onboard graphics, we already have this problem : where drm and agp both want the same device. Having a model of: : : vga0 : drm0 : agp0 : : Might be the sanest way to do this cleanly. Yes. I like that model. While it might be nice to have a reauction of devices in the newbus level, I think that for this case there's limited usefulness in doing that. Having vga driver that others attach to will also allow drm drivers to possibly attach to a vga driver that's attached to something other than a pci bus. WarnerReceived on Fri Jan 30 2004 - 09:11:07 UTC
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