Re: What is the difference of "user idle state" and "system idle s

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From: Paul G. Tobey [eMVP] (ptobey)
Date: 08/04/04 

Date: Wed, 4 Aug 2004 12:33:08 -0700

Able to, yes, but not specifically targeted at that device, no. Not every
chipset is going to have a backlight control signal. Most don't, in fact.
Since there is no standard way to do that, it would have to be a driver
specifically for whatever part has that signal. All you'd have to do is
look in the catalog for such a driver. It might be a public driver (in the
\public path), or a BSP driver (under \platform). However, I'd say no,
there's no such thing that comes with PB. Your question is better phrased,
"Do the drivers from Platform Builder have a backlight driver ***for the GX1
+ CLE266*** included?"

Paul T.

"David" <david@acrosser.com> wrote in message
news:00e701c47a58$fbffc2d0$3501280a@phx.gbl...
> Thanks for the reply...
> Basically, the chipset is LCD-ready. This means it has
> all the LCD data signals (TTL), as well as an "Enable
> Backlight" signal. I just wanted to know whether the
> drivers provided in Platform Builder is able to
> communicate to the chipset (Geode's GX1 or VIA's CLE266).
> It shouldn't require any external controls (GPIO) to
> control the backlight... So the question still stands:
> Do the drivers from Platform Builder have a backlight
> driver integrated with it?
>
> Thanks again.
>
>
> >-----Original Message-----
> >Backlight for what? They wouldn't know what to do to
> turn it on and off.
> >You'd have to clone and modify those drivers to add
> support for whatever
> >backlight control you have (GPIO?)
> >
> >Paul T.
> >
> >"David" <david@acrosser.com> wrote in message
> >news:099601c47650$b5425120$3501280a@phx.gbl...
> >> Thanks Dean, for your reply. You said, "Sometimes it's
> a
> >> part of the display driver, other times it's on it's
> >> own." To confirm, are you saying that the "VGA Linear
> >> (Flat) Framebuffer" and "Geode/MediaGX" drivers provided
> >> in Platform builder do not have the backlight driver
> >> integrated in it?
> >>
> >>
> >> >-----Original Message-----
> >> >There is no standard backlight driver in CE. It's up
> to
> >> you to implement
> >> >hardware control over backlight functionality on your
> >> own. Sometimes it's a
> >> >part of the display driver, other times it's on it's
> >> own. CE just provides
> >> >a high level user interface/configuration mechanism,
> and
> >> it's up to your
> >> >driver to use that information in determining how to
> >> handle backlight
> >> >hardware.
> >> >
> >> >So, you need to read the registry at the appropriate
> >> times, and handle the
> >> >backlight hardware accordingly.
> >> >
> >> >--
> >> >Dean Ramsier - eMVP
> >> >
> >> >
> >> >"David" <david@acrosser.com> wrote in message
> >> >news:07de01c475c9$33b93ab0$3a01280a@phx.gbl...
> >> >> I have this problem as well. The backlight, although
> >> set
> >> >> in Control Panel, does not function. I have ensured
> >> that
> >> >> the registry settings exist.
> >> >> i.e.
> >> >> [HKEY_CURRENT_USER\ControlPanel\Backlight]
> >> >> BatteryTimeout = 15
> >> >> ACTimeout = 15
> >> >> Also, the Cesysgen.bat file already has the following
> >> code:
> >> >> set CPLMAIN_COMPONENTS=%CPLMAIN_COMPONENTS% backlight
> >> >>
> >> >> I have tested the ddi_flat.dll, ddi_gx.dll, as well
> as a
> >> >> VIA (cle266) driver. None of these seem to do
> anything
> >> >> with the backlight. In the hardware level, I also
> made
> >> >> sure the backlight signal is tied to the "enable
> >> >> backlight" signal coming off of the chipset.
> >> >>
> >> >> Any assistance? Thanks in advance...
> >> >>
> >> >>
> >> >> >-----Original Message-----
> >> >> >Thanks for your help,Steve Maillet .
> >> >> >I still have the following questions to ask for you.
> >> >> >1. I want to know what is the device state of user
> >> idle
> >> >> state and system idle. In these states ,what is the
> >> >> diference of device states in wince.net for PXA255
> >> >> (LUBBOCK).
> >> >> >
> >> >> >2. For the LUBBOCK SDB, when I have set the timeout
> >> value
> >> >> in the "control panel->display->backlight" and reach
> the
> >> >> timeout, the backlight of the device doesn't lose
> >> >> power.But I know the wince.net should fully support
> the
> >> >> LUBBOCK SDB of intel.
> >> >> >
> >> >> >Thanks.
> >> >> >Fred
> >> >> >
> >> >> >
> >> >> >
> >> >> >"Steve Maillet (eMVP)" wrote:
> >> >> >
> >> >> >> > I have a LUBBCOK SDB.
> >> >> >> My sympathies to you... ;-)
> >> >> >>
> >> >> >> > I want to know the following questions.
> >> >> >> > What is the difference of "user idle state"
> >> >> and "system idle state"?
> >> >> >> They are different states for the power manager
> based
> >> >> on timeouts that can
> >> >> >> be independently reset. The system must first
> timeout
> >> >> on User Idle before it
> >> >> >> switches to System Idle when it times out of
> system
> >> >> idle it suspends the
> >> >> >> system. Exactly what the state of various devices
> and
> >> >> device driers is
> >> >> >> during each state is up to you and the device
> driver
> >> >> writer.
> >> >> >>
> >> >> >> > and can wince.net 4.2 support waking the device
> >> from
> >> >> suspend state by
> >> >> >> touch screen interrupt?
> >> >> >> Yes, any interrupt that the hardware supports for
> >> >> waking the system is
> >> >> >> available to - well, wake the system! ;- In other
> >> words
> >> >> it's more a hardware
> >> >> >> question whether a particular interrupt source on
> a
> >> >> particular hardware
> >> >> >> platform can support waking the system up.
> >> >> >>
> >> >> >> > Why the setting in backlight of control panel
> lose
> >> >> function?
> >> >> >> Not clear on what you are asking. Can you
> rephrase?
> >> >> >>
> >> >> >> > Should I modify the source codes upon the
> default
> >> >> codes of wince.net 4.2?
> >> >> >> Not clear here either - but for safety - Don't
> modify
> >> >> the COMMON code in
> >> >> >> place. Clone it first.
> >> >> >>
> >> >> >>
> >> >> >>
> >> >> >>
> >> >> >> --
> >> >> >> Steve Maillet (eMVP)
> >> >> >> EmbeddedFusion
> >> >> >> smaillet_AT_EmbeddedFusion_DOT_com
> >
> >
> >.
> >

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