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    SubjectRe: [PATCH] Revert "drm/i915: fix vblank wait test condition"
      On 5.9.2010 1.44, Sitsofe Wheeler wrote:
    > On Sat, Sep 04, 2010 at 10:42:46PM +0200, Sven Joachim wrote:
    >> On 2010-09-04 21:54 +0200, Hugh Dickins wrote:
    >>> On Sat, 4 Sep 2010, Pekka Enberg wrote:
    >>>> On Sat, 4 Sep 2010 11:17:14 +0300, Pekka Enberg<> wrote:
    >>>>>> This reverts commit 9559fcdbff4f93d29af04478bbc48294519424f5. The commit causes
    >>>>>> wrong screen resolution on some i915 machines such as MacBook which is a
    >>>>>> regression from 2.6.35. The issue has been reported multiple times but no fix
    >>>>>> has emerged:
    >>>> On Sat, Sep 4, 2010 at 12:21 PM, Chris Wilson<> wrote:
    >>>>> NAK. You can't simply hide one bug by introducing a much bigger one.
    >>>> Dude, it's a nasty regression from 2.6.35. What exactly are you NAK'ing here?
    >>>>> As you have an affected machine, find which wait_for_vblank() needs to be
    >>>>> replaced with a msleep(20|50).
    >>>> The attached patch fixes things here. I'm not a drm developer so I
    >>>> don't know if it makes technical sense.
    >>> Many thanks to you, Pekka: I also don't know if it makes technical sense,
    >>> but it solves the same issue for me, so I can at last use 2.6.36-rc on
    >>> this laptop.
    >> Helps for me as well, but I cannot judge whether it makes technical
    >> sense either. Thanks, Pekka!
    > Sadly this doesn't help my EeePC 900 with an i915 when it is booted with
    > a battery inside or after doing a suspend to ram (running
    > modetest/xrandr in these situations says VGA is connected when there
    > isn't even a cable attached).
    I haven't heard of this problem. Is it reported on LKML? Is it a
    regression from 2.6.35?


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