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    SubjectRe: [Bug #16307] i915 in kernel 2.6.35-rc3, high number of wakeups
    Date
    Hi,

    On Sat, 24 Jul 2010 11:19:50 +0200, Enrico Bandiello <enban@postal.uv.es> wrote:
    > On 07/23/2010 07:25 PM, Jesse Barnes wrote:
    > > On Fri, 23 Jul 2010 13:47:31 +0200 (CEST)
    > > "Rafael J. Wysocki"<rjw@sisk.pl> wrote:
    > >
    > >> This message has been generated automatically as a part of a summary report
    > >> of recent regressions.
    > >>
    > >> The following bug entry is on the current list of known regressions
    > >> from 2.6.34. Please verify if it still should be listed and let the tracking team
    > >> know (either way).
    > >>
    > >>
    > >> Bug-Entry : http://bugzilla.kernel.org/show_bug.cgi?id=16307
    > >> Subject : i915 in kernel 2.6.35-rc3, high number of wakeups
    > >> Submitter : Enrico Bandiello<enban@postal.uv.es>
    > >> Date : 2010-06-26 16:57 (28 days old)
    > >> Message-ID :<4C26317A.5070309@postal.uv.es>
    > >> References : http://marc.info/?l=linux-kernel&m=127757403404259&w=2
    > >
    > > Just updated the bug for this one. Enrico, you say this behavior is
    > > recent. Can you bisect between 2.6.34 and when the problem started?
    > >
    > Hi. I just tried, but can't find anything useful until now (surely it's
    > my fault: it was my first attempt at bisection). Please let me try again
    > in the next days.

    I also noticed that interrupts keeps high in powertop. I bisected it
    today:

    # bad: [e44a21b7268a022c7749f521c06214145bd161e4] Linux 2.6.35-rc2
    # good: [e40152ee1e1c7a63f4777791863215e3faa37a86] Linus 2.6.34
    git bisect start 'v2.6.35-rc2' 'v2.6.34'
    # good: [2086ca482f89950410527425913ca48d948e9622] i2c-algo-pca: Fix coding style issues
    git bisect good 2086ca482f89950410527425913ca48d948e9622
    # bad: [1756ac3d3c41341297ea25b818b7fce505bb2a9a] Merge branch 'virtio' of git://git.kernel.org/pub/scm/linux/kernel/git/rusty/linux-2.6-for-linus
    git bisect bad 1756ac3d3c41341297ea25b818b7fce505bb2a9a
    # bad: [ec2a7587e0a91d5c1afe23a0a73edfce06c5e4e0] Merge branch 'msm-video' of git://codeaurora.org/quic/kernel/dwalker/linux-msm
    git bisect bad ec2a7587e0a91d5c1afe23a0a73edfce06c5e4e0
    # good: [e0bc5d4a54938eedcde14005210e6c08aa9727e4] Merge branch 'i2c-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jdelvare/staging
    git bisect good e0bc5d4a54938eedcde14005210e6c08aa9727e4
    # good: [ac3ee84c604502240122c47b52f0542ec8774f15] Merge branch 'dbg-early-merge' of git://git.kernel.org/pub/scm/linux/kernel/git/jwessel/linux-2.6-kgdb
    git bisect good ac3ee84c604502240122c47b52f0542ec8774f15
    # bad: [f4b7fb94c576265ceffc43031805ade32fa80c6a] drm/radeon/kms: take vram mutex pointer before derefing object.
    git bisect bad f4b7fb94c576265ceffc43031805ade32fa80c6a
    # bad: [0bcb1d844ac638a4c4280f697d5bfac9791e9a70] Merge branch 'drm-radeon-lockup' into drm-core-next
    git bisect bad 0bcb1d844ac638a4c4280f697d5bfac9791e9a70
    # bad: [77ffb5979de59efd1a6b280b10d647b09285bee0] drm/i915/pch: Use minimal number of FDI lanes (v2)
    git bisect bad 77ffb5979de59efd1a6b280b10d647b09285bee0
    # bad: [ab00a9ef8d4ce7de4d5b15cbf4101feeb8cf7f4d] drm/i915: Un-magic a DPCD register write
    git bisect bad ab00a9ef8d4ce7de4d5b15cbf4101feeb8cf7f4d
    # skip: [0f3ee801b332d6ff22285386675fe5aaedf035c3] drm/i915: Allow LVDS on pipe A on gen4+
    git bisect skip 0f3ee801b332d6ff22285386675fe5aaedf035c3
    # good: [5bf4c9c469ffc64b85fed1f3d2b0c8b19909ed13] drm/i915: use encoder_list for hotplug callback
    git bisect good 5bf4c9c469ffc64b85fed1f3d2b0c8b19909ed13
    # bad: [d275f6614e160fa71d6e2201eb34c9b41fd8473c] drm/i915: Clear the LVDS pipe B select bit when moving the LVDS to pipe A.
    git bisect bad d275f6614e160fa71d6e2201eb34c9b41fd8473c
    # good: [c1c43977e6fc789cbde094303fa9ace629a35aca] drm/i915: passing drm connector param for load detection
    git bisect good c1c43977e6fc789cbde094303fa9ace629a35aca
    # good: [6443170f6d862a1cc89e61e4bb2410b714b875f4] drm/i915: Remove dead KMS encoder save/restore code.
    git bisect good 6443170f6d862a1cc89e61e4bb2410b714b875f4

    The bisect stopped between d275f66 and 0f3ee80 so I reverted the
    following three commits:

    b3b095b drm/i915: enable LVDS on Cougarpoint
    d275f66 drm/i915: Clear the LVDS pipe B select bit when moving the LVDS to pipe A.
    0f3ee80 drm/i915: Allow LVDS on pipe A on gen4+

    Now the powertop only shows about 0.2 interrupts per second. Hope this
    information is useful.

    Regards,
    Kanru


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