Subject: Re: X (was Re: Call for testers: i386 ACPI suspend/resume support)
To: Perry E. Metzger <>
From: Matthieu Herrb <>
List: current-users
Date: 06/22/2006 15:33:21
Perry E. Metzger wrote:
> Garrett D'Amore <> writes:
>>>This is not surprising. S3 is allowed to power off *everything* but
>>>memory, so the state of the video chip is lost. On restore we do a
>>>reset of the video, but we don't know what the state of the chip was
>>>before sleep. X effectively manages the drivers entirely in userland,
>>>so unless X decides to re-initialize the display it is going to be
>>>screwed up.
>>This is another example of why, IMO, the architecture of X talking
>>directly to registers is an incredibly bad idea.
> It might (or might not) be a bad idea, but we simply do not have the
> manpower to deal with the vast flow of new video cards that arrive
> with time. We have to use the drivers because by doing that, we
> get to piggyback on all their manpower. Unless you have a way to fix
> that problem, even if the current system sucks rocks, we'll have to
> continue using it.
> Perry

Most X drivers have hooks for power management (APM or ACPI). The
os-support layer needs to be adapted so that these hooks are called. For
now only APM is handled on BSD systems.
Matthieu Herrb