Re: What PM should be and do (Was Re: Solving suspend-level confusion)

From: Qric?= Brunet (ebrunet_at_quatramaran.ens.fr)
Date: 08/07/04

  • Next message: Dave Airlie: "Re: DRM function pointer work.." 
    To: linux-kernel@vger.kernel.org
Date:	Sat, 7 Aug 2004 02:08:24 +0200

    Dans ens.mailing-lists.linux-kernel, vous avez écrit :
    >> > - support for telling what class of device a driver is handling (I'm
    >> > particularly interested in keeping the keyboard, screen and storage
    >> > devices alive while suspending).
    >>
    >> You can see that info today from userspace by looking in
    >> /sys/class/input, /sys/class/graphics, and /sys/block

    It is a minor point, but as many people are working on swsuspend right
    now, I thought I'd mentionned it. It seems (as of 2.6.8.rc1) that the
    screen is not shut down or put in a low power state when suspending to
    disk.

    I guess that for 99.5 % of the population, it is not an issue as the
    monitor is usually plugged in the power supply of the computer and
    power is cut when the computer shuts down. My monitor, however, is
    directly plugged in the mains outlet and, after a suspend to disk, it
    displays indefinitely an information box stating that it has no video
    signal coming in.

    The X server knows how to shutdown (DPMS) the screen afer some
    inactivity, so I guess the kernel could do that while suspending. And it
    would be very nice if it would. But I believe there is no device
    driver handling the monitor, so I don't know where to do it.

    Éric Brunet
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  • Next message: Dave Airlie: "Re: DRM function pointer work.."

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