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    SubjectRe: [Bug #14670] i915: playing video via XVideo extension makes the screen flicker
    On Tue, 12 Jan 2010 18:43:09 +0100
    Thomas Meyer <thomas@m3y3r.de> wrote:

    > Am Montag, den 11.01.2010, 11:19 -0800 schrieb Jesse Barnes:
    > > On Mon, 11 Jan 2010 20:03:57 +0100
    > > Thomas Meyer <thomas@m3y3r.de> wrote:
    > >
    > > >
    > > >
    > > > Am 11.01.2010 um 17:55 schrieb Jesse Barnes
    > > > <jbarnes@virtuousgeek.org>:
    > > >
    > > > > On Mon, 11 Jan 2010 17:53:04 +0100
    > > > > Thomas Meyer <thomas@m3y3r.de> wrote:
    > > > >
    > > > >> Am Sonntag, den 10.01.2010, 23:56 +0100 schrieb Rafael J.
    > > > >> Wysocki:
    > > > >>> This message has been generated automatically as a part of a
    > > > >>> report of regressions introduced between 2.6.31 and 2.6.32.
    > > > >>>
    > > > >>> The following bug entry is on the current list of known
    > > > >>> regressions introduced between 2.6.31 and 2.6.32. Please
    > > > >>> verify if it still should be listed and let me know (either
    > > > >>> way).
    > > > >>>
    > > > >>
    > > > >> Yes, still should be listed.
    > > > >>
    > > > >> Problem still exists in 2.6.32.3 and 2.6.33-rc3-00097-g2c1f189,
    > > > >> that contains
    > > > >> this commit:
    > > > >> http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=cda9d05c499093c67b4a376a15009923acc2127a
    > > > >>
    > > > >> The above commit removes the render reclock support, that
    > > > >> ought to fix a common kind of problem encountered on i915
    > > > >> hardware, but not on my machine.
    > > > >>
    > > > >> Still need to boot with "nomodeset" to have a workable system.
    > > > >
    > > > > Does this patch prevent the flicker?
    > > >
    > > > By the way: how often and in what interval is the function
    > > > intel_lvds_detect called?
    > > >
    > > > How long will/can the function acpi_lid_open take to complete?
    > > > Maybe some acpi interpretation takes really long? Is this
    > > > possible?
    > > >
    > > > Would this explain the flickering?
    > >
    > > It should only be called when a client requests the connection
    > > status (e.g. xrandr or the GNOME display applet).
    >
    > how to check how often this function is called and it's duration? is
    > the function tracer capable of this?

    Yeah, the function tracer should be able to do it (though I don't know
    how to use it offhand, maybe through the perf tool?). Or you could
    just add some DRM_ERROR lines. :)

    > > The LVDS state will also be checked at ACPI LID event time, maybe
    > > your platforms is getting spurious LID events?
    >
    > maybe! where can I check this? acpid log file?

    Yeah or using acpi_listen I think.

    --
    Jesse Barnes, Intel Open Source Technology Center


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