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    SubjectRe: [PATCH] DRM / radeon / PM: Do not evict VRAM during freeze phase of hibernation
    On Friday, June 18, 2010, Dave Airlie wrote:
    > On Fri, 2010-06-18 at 22:21 +0200, Rafael J. Wysocki wrote:
    > > From: Rafael J. Wysocki <>
    > >
    > > I have recently noticed a 55 sec. delay during the "device freeze"
    > > phase of hibernation on my test-bed HP nx6325. Due to the 100%
    > > reproducibility of it I was able to narrow it down to
    > > radeon_suspend_kms() and then it turned out that the delay occured
    > > somewhere in radeon_bo_evict_vram(). However, it doesn't seem really
    > > necessary or even very useful to me to evict VRAM at this particular
    > > point, because we're going to create an image and bring the device
    > > back to the fully functional state in a little while. Thus, I think
    > > the VRAM evicition can be skipped for state.event == PM_EVENT_FREEZE,
    > > which makes the delay go away.
    > I'm not 100% sure of the hibernate sequencing and its early in the
    > morning, but we want to evict VRAM before image building so we can have
    > the contents of VRAM in the image so we can restore them on resume. Does
    > this just avoid evicting them a second time after we created the image?

    No, it's the first time, before creating the image, but I didn't seen any
    difference on resume with and without the patch, so I thought it was a good
    idea. :-)

    If you don't like it, though, I guess it will be necessary to find the root
    cause of the delay.


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