[Bug 75102] Radeon 4890 getting a blank screen and fans go up to 100% (kernel 3.13.3)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=75102

--- Comment #9 from Peter Asplund <peterasplund at gentoo.se> ---
I've done the bisect! And maaaan was it tiring. I think I've built the kernel
60-70 times, since the crash seems to be more reproducible when the system is
under stress. Then I had to keep it under stress to see if it finally crashed
and repeated the behaviour, which could take all from 2 minutes to 30 minutes!

I also managed to not wait long enough for a crash, which lead to an incorrect
"git bisect good" at the third step, and I had to do it all over again when I
reached an incorrect result after 7 steps!

Buuuut, now I think I've nailed it down! Here's the bisect log, and the result:

git bisect start
# bad: [d8ec26d7f8287f5788a494f56e8814210f0e64be] Linux 3.13
git bisect bad d8ec26d7f8287f5788a494f56e8814210f0e64be
# good: [5e01dc7b26d9f24f39abace5da98ccbd6a5ceb52] Linux 3.12
git bisect good 5e01dc7b26d9f24f39abace5da98ccbd6a5ceb52
# good: [2f466d33f5f60542d3d82c0477de5863b22c94b9] Merge tag
'pci-v3.13-changes' of
git://git.kernel.org/pub/scm/linux/kernel/git/helgaas/pci
git bisect good 2f466d33f5f60542d3d82c0477de5863b22c94b9
# bad: [760c960bd6880cf22a57c0af9ff60c96250aad39] drm/sysfs: fix hotplug
regression since lifetime changes
git bisect bad 760c960bd6880cf22a57c0af9ff60c96250aad39
# bad: [16cd9d1c0f149ee0c8073de037e7c57886234aa0] Merge branch
'hwmon-for-linus' of
git://git.kernel.org/pub/scm/linux/kernel/git/jdelvare/staging
git bisect bad 16cd9d1c0f149ee0c8073de037e7c57886234aa0
# good: [f080480488028bcc25357f85e8ae54ccc3bb7173] Merge tag 'for-linus' of
git://git.kernel.org/pub/scm/virt/kvm/kvm
git bisect good f080480488028bcc25357f85e8ae54ccc3bb7173
# bad: [8d0a2215931f1ffd77aef65cae2c0becc3f5d560] Merge branch 'drm-next-3.13'
of git://people.freedesktop.org/~agd5f/linux into drm-next
git bisect bad 8d0a2215931f1ffd77aef65cae2c0becc3f5d560
# bad: [ec61f5eb5895926a7ad8bb4472bdc95dc1e44764] drm/mgag200: drop pointless
info print.
git bisect bad ec61f5eb5895926a7ad8bb4472bdc95dc1e44764
# bad: [bbf1f8bfef7fbe1ea5634d7559770b805510ad8d] Merge branch 'drm-next-3.13'
of git://people.freedesktop.org/~agd5f/linux into drm-next
git bisect bad bbf1f8bfef7fbe1ea5634d7559770b805510ad8d
# good: [be51e4a78155ff6c5d9299bf726e86b554e21117] Merge tag
'drm-intel-next-2013-10-18' of git://people.freedesktop.org/~danvet/drm-intel
into drm-next
git bisect good be51e4a78155ff6c5d9299bf726e86b554e21117
# good: [90c37067b70d6090a316227698a0cba40f8003bd] Merge tag 'drm/for-3.13-rc1'
of git://anongit.freedesktop.org/tegra/linux into drm-next
git bisect good 90c37067b70d6090a316227698a0cba40f8003bd
# bad: [f9eaf9ae782d6480f179850e27e6f4911ac10227] drm/radeon: rework and fix
reset detection v2
git bisect bad f9eaf9ae782d6480f179850e27e6f4911ac10227
# bad: [d5693761b2b4ff530c8af8af9ec55b6eae76e617] drm/radeon/si: fix define for
MC_SEQ_TRAIN_WAKEUP_CNTL
git bisect bad d5693761b2b4ff530c8af8af9ec55b6eae76e617
# bad: [6ba81e538a786281a9650efd14c6a194f35bde04] drm/radeon: fix endian
handling in rlc buffer setup
git bisect bad 6ba81e538a786281a9650efd14c6a194f35bde04
# bad: [14ac88af156efcefac9ba3cf249ae84f9ff71d37] drm/radeon/dpm: retain user
selected performance level across state changes
git bisect bad 14ac88af156efcefac9ba3cf249ae84f9ff71d37
# first bad commit: [14ac88af156efcefac9ba3cf249ae84f9ff71d37] drm/radeon/dpm:
retain user selected performance level across state changes

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