[Bug 46660] Xorg & KMS go to black screen after linux version 2.6.39

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https://bugs.freedesktop.org/show_bug.cgi?id=46660

--- Comment #10 from Vladi <vladi@xxxxxxxxxxxx> 2012-03-04 12:00:52 PST ---
New bisect this time marking blank screen on KMS bad gives this as the problem
commit.

805c22168da76a65c978017d0fe0d59cd048e995 is the first bad commit
commit 805c22168da76a65c978017d0fe0d59cd048e995
Author: Alex Deucher <alexdeucher@xxxxxxxxx>
Date:   Mon Jun 6 17:39:16 2011 -0400

    drm/radeon/kms: disable hdmi audio by default

    The current RE'd code causes blank screens and
    display problems on a lot of systems.  So disable
    it by default for now.  It can still be enabled
    by setting the audio parameter to 1.  E.g.:
    radeon.audio=1

    Fixes:
    https://bugs.freedesktop.org/show_bug.cgi?id=38010
    https://bugs.freedesktop.org/show_bug.cgi?id=27731
    https://bugs.freedesktop.org/show_bug.cgi?id=35970
    https://bugs.freedesktop.org/show_bug.cgi?id=26195
    and many other reported problems.

    Signed-off-by: Alex Deucher <alexdeucher@xxxxxxxxx>
    Signed-off-by: Dave Airlie <airlied@xxxxxxxxxx>

:040000 040000 76f7b2fe88e902f82350d83f8b3cd50d9953ea15
2ce00f65258860a1afc7ca89e4f15c4de5bb4cca M    drivers

LOG:

# bad: [02f8c6aee8df3cdc935e9bdd4f2d020306035dbe] Linux 3.0
# good: [61c4f2c81c61f73549928dfd9f3e8f26aa36a8cf] Linux 2.6.39
git bisect start 'v3.0' 'v2.6.39' '--'
# good: [6b36fdd11b15b6fea900f7fa0195ca3f54a33153] ARM: mach-shmobile: AG5EVM
DSI resource string update
git bisect good 6b36fdd11b15b6fea900f7fa0195ca3f54a33153
# good: [9b83c771214cf6a256ee875050e6eaf320cf7983] xen/blkback: potential null
dereference in error handling
git bisect good 9b83c771214cf6a256ee875050e6eaf320cf7983
# bad: [10e18e62309a882c513b4f516527055b6a60d668] Merge branch
'kvm-updates/3.0' of git://git.kernel.org/pub/scm/virt/kvm/kvm
git bisect bad 10e18e62309a882c513b4f516527055b6a60d668
# good: [12871a0bd67dd4db4418e1daafcd46e9d329ef10] Merge branch
'drm-radeon-fixes' of
git://git.kernel.org/pub/scm/linux/kernel/git/airlied/drm-2.6
git bisect good 12871a0bd67dd4db4418e1daafcd46e9d329ef10
# bad: [562d1ffed2082fc59fb72173b856822ffe781559] Merge branch 'spi/merge' of
git://git.secretlab.ca/git/linux-2.6
git bisect bad 562d1ffed2082fc59fb72173b856822ffe781559
# bad: [461df4ded3a143f09f9d0e870e7b16b787dc0591] Merge branch 'staging-linus'
of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/staging-2.6
git bisect bad 461df4ded3a143f09f9d0e870e7b16b787dc0591
# bad: [467701e2862454b25e6cdf1171e0cea88ed5f21d] Merge branch
'stable/bug.fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/konrad/xen
git bisect bad 467701e2862454b25e6cdf1171e0cea88ed5f21d
# bad: [805c22168da76a65c978017d0fe0d59cd048e995] drm/radeon/kms: disable hdmi
audio by default
git bisect bad 805c22168da76a65c978017d0fe0d59cd048e995
# good: [dcc32b838b449aef8533f130cfad41b912bfb228] Merge remote branch
'nouveau/drm-nouveau-fixes' of /ssd/git/drm-nouveau-next into drm-fixes
git bisect good dcc32b838b449aef8533f130cfad41b912bfb228
# good: [d681f1204d701cafbc45fa90e0ac977acddc33cc] Merge branch
'x86-urgent-for-linus' of
git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
git bisect good d681f1204d701cafbc45fa90e0ac977acddc33cc
# good: [c5182b8867e189e14a8df5dbfcba1c73f286e061] genirq: Ensure we locate the
passed IRQ in irq_alloc_descs()
git bisect good c5182b8867e189e14a8df5dbfcba1c73f286e061
# good: [428c6e3630b343d5b3034af914015d10c94bb90e] drm/radeon/kms: set family
for use in parser.
git bisect good 428c6e3630b343d5b3034af914015d10c94bb90e
# good: [62fff811d73095bd95579d72f558f03c78f7914a] drm/radeon/kms: fix for
radeon on systems >4GB without hardware iommu
git bisect good 62fff811d73095bd95579d72f558f03c78f7914a

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