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    SubjectRe: Linux 2.6.35-rc2
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    On Mon, Jun 7, 2010 at 2:22 AM, Dave Airlie <airlied@gmail.com> wrote:
    > On Mon, Jun 7, 2010 at 4:09 PM, Torsten Kaiser
    > <just.for.lkml@googlemail.com> wrote:
    >> On Mon, Jun 7, 2010 at 7:58 AM, Alex Deucher <alexdeucher@gmail.com> wrote:
    >>> On Sun, Jun 6, 2010 at 11:04 AM, Torsten Kaiser
    >>> <just.for.lkml@googlemail.com> wrote:
    >>>> [CC:Jeff+Tejun not removed, because you might want to look at the
    >>>> attached dmesgs]
    >>>>
    >>>> On Sun, Jun 6, 2010 at 4:19 PM, Linus Torvalds
    >>>> <torvalds@linux-foundation.org> wrote:
    >>>>> On Sun, 6 Jun 2010, Torsten Kaiser wrote:
    >>>>>>
    >>>>>> The first problem that shows up is, that after the KMS switches to the
    >>>>>> correct video mode (1280x1024 for an DVI attached LCD), the display
    >>>>>> begins to flicker. Every 1..2 seconds (guesstimated) the display turns
    >>>>>> off and on again. Something in the new powersaving?
    >>>>>
    >>>>> Or maybe a borderline display timing that the display has trouble syncing
    >>>>> up with?
    >>>>
    >>>> With 2.6.34 and any previous KMS kernels the output was always stable.
    >>>> (I think, I switch to the radeon KMS on 2.6.32)
    >>>> The onscreen menu of the monitor showed 1280x1024@60.2Hz for
    >>>> 2.6.35-rc2, if I recall correctly.
    >>>> Now back on 2.6.34 its 1280x1024@59.9Hz.
    >>>
    >>> The pm code shouldn't have any affect as your system only has one
    >>> power state, so it never kicks in.  It sounds like a display pll
    >>> problem, but there haven't been any changes to that code since 2.6.34.
    >>>  Any chance you could bisect it?
    >>
    >> Not really. -rc1 did not boot for me (although if I disable v4l that
    >> might work), and there is this memory corruption error.
    >>
    >> Regarding the PLLs, did you see this mail? It contains the
    >> drm.debug=15 output from 2.6.34 and 2.6.35-rc2.
    >> http://lkml.org/lkml/2010/6/6/126
    >>
    >> The debug output from radeon_set_pll looks identical. But in 2.6.35 a
    >> call to [drm:radeon_legacy_tmds_int_dpms], seems new.
    >>
    >> The switchoff intervall is ~10 seconds, not 1..2 as I guessed in the first mail.
    >> Any idea if there is something in the KMS code that triggers at this intervall?
    >
    > The new mode probing code happens every 10 seconds, though we
    > shouldn't be turning anything on or off with it.
    >
    > So I suspect the DAC detection table might be doing bad things on your
    > hardware, we have had a problem where the dac detect table on one DAC
    > would turn the other one off which clearly wasn't what we wanted to
    > see.
    > ,

    The x300 is a non-atom card, so it uses the legacy load detection
    routines which do mess with some of the crtc regs.

    Alex

    > can you file a bug at kernel.org? full dmesg (need all the radeon bits
    > where it finds the card).
    >
    > Dave.
    >
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