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    SubjectRe: Suspend to disk broken in latest 2.6.28-rc3
    Date
    On Monday, November 10, 2008 2:13 pm Mathieu Chouquet-Stringer wrote:
    > On Mon, Nov 10, 2008 at 10:42:39AM +0100, Pavel Machek wrote:
    > > Trying with minimum drivers is likely to help here, and should be
    > > easier than bisect. Boot with init=/bin/bash, then try "devices" >
    > > pm_dest and disk > state...
    >
    > Some progress with (2.6.28-rc4 this time)... I've booted with /bin/bash
    > as init: works.
    >
    > Then I rebooted in single mode => works
    > Runlevel 3 => works
    > Runlevel 5 => doesn't work
    >
    > In terms of devices, lsmod says the only differences between runlevel 3
    > and runlevel 5 are that both drm and radeon are loaded...
    >
    > If I rmmod radeon and drm while X is running suspending the devices
    > works... I guess I don't have DRI enabled??? Just looked at the logs,
    > I guess I don't [1]...
    >
    > Looking at a git log -p of gpu/drm/radeon shows lots of difference
    > between 2.6.26 and HEAD... I see a vblank change [2] that changes the
    > way the device is suspended, not sure if it really matters though...
    >
    > Alex, Jesse and/or Dave can you think of anything before I bisect? FYI
    > my radeon is a:
    > ATI Technologies Inc Radeon Mobility M7 LW [Radeon Mobility 7500] rev 0,

    If you have radeon loaded but DRI was never enabled, you'll likely see a
    crash. That's because the radeon driver doesn't map the registers it needs
    for suspend/resume at load time; they only get mapped by DRI initialization
    code which lives in the X driver. There's a patch in
    http://bugzilla.kernel.org/show_bug.cgi?id=11891 that might help you...

    --
    Jesse Barnes, Intel Open Source Technology Center



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