git bisect log:

git bisect start
# good: [76e10d158efb6d4516018846f60c2ab5501900bc] Linux 3.4
git bisect good 76e10d158efb6d4516018846f60c2ab5501900bc
# bad: [28a33cbc24e4256c143dce96c7d93bf423229f92] Linux 3.5
git bisect bad 28a33cbc24e4256c143dce96c7d93bf423229f92
# good: [59cd358a7a5b2f6b61faa01dae6cfda3830ac62a] Merge tag 'perf-core-for-mingo' of git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux into perf/urgent
git bisect good 59cd358a7a5b2f6b61faa01dae6cfda3830ac62a
# good: [7e5b2db77b05746613516599c916a8cc2e321077] Merge branch 'upstream' of git://git.linux-mips.org/pub/scm/ralf/upstream-linus
git bisect good 7e5b2db77b05746613516599c916a8cc2e321077
# bad: [e72643088f576032d0d30c1d62c8fc077f383edc] Merge tag 'upstream-3.5-rc2' of git://git.infradead.org/linux-ubifs
git bisect bad e72643088f576032d0d30c1d62c8fc077f383edc
# good: [419f4319495043a9507ac3e616be9ca60af09744] Merge branch 'for-3.5' of git://linux-nfs.org/~bfields/linux
git bisect good 419f4319495043a9507ac3e616be9ca60af09744
# bad: [f5e7e844a571124ffc117d4696787d6afc4fc5ae] Merge tag 'for-linus-3.5-20120601' of git://git.infradead.org/linux-mtd
git bisect bad f5e7e844a571124ffc117d4696787d6afc4fc5ae
# good: [1193755ac6328ad240ba987e6ec41d5e8baf0680] Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs
git bisect good 1193755ac6328ad240ba987e6ec41d5e8baf0680
# bad: [48445159e9ecb44a96a4de06c6ae7c54eb43ba5b] Merge branch 'for_linus' of git://cavan.codon.org.uk/platform-drivers-x86
git bisect bad 48445159e9ecb44a96a4de06c6ae7c54eb43ba5b
# bad: [efff0471b0dd8b08ca3830b06a9083f6d6cef44e] Merge branch 'ux500/hickup' of git://git.kernel.org/pub/scm/linux/kernel/git/arm/arm-soc
git bisect bad efff0471b0dd8b08ca3830b06a9083f6d6cef44e
# good: [37b22400f86e83076c8e540b65e8b7e3f1f63e6b] Merge tag 'sound-3.5' of git://git.kernel.org/pub/scm/linux/kernel/git/tiwai/sound
git bisect good 37b22400f86e83076c8e540b65e8b7e3f1f63e6b
# good: [4a85c7fa52d71806dd7389486f11eda907b49fd6] ARM: ux500: Add support for ab8500 regulators into the Device Tree
git bisect good 4a85c7fa52d71806dd7389486f11eda907b49fd6
# bad: [416a2bd274566a6f607a271f524b2dc0b84d9106] drm/radeon: fixup tiling group size and backendmap on r6xx-r9xx (v4)
git bisect bad 416a2bd274566a6f607a271f524b2dc0b84d9106
# good: [08ef8e41a6f420c3c0998b50d478e0b2c267a226] drm/mgag200: kick off conflicting framebuffers earlier.
git bisect good 08ef8e41a6f420c3c0998b50d478e0b2c267a226
# good: [0b8c30bc4943137a4a36b9cb059b1cc684f5d702] drm/radeon: properly program gart on rv740, juniper, cypress, barts, hemlock
git bisect good 0b8c30bc4943137a4a36b9cb059b1cc684f5d702
# good: [95c4b23ec4e2fa5604df229ddf134e31d7b3b378] drm/radeon: fix HD6790, HD6570 backend programming
git bisect good 95c4b23ec4e2fa5604df229ddf134e31d7b3b378



git bisect visualize:

commit 416a2bd274566a6f607a271f524b2dc0b84d9106
Author: Alex Deucher <alexander.deucher@amd.com>
Date:   Thu May 31 19:00:25 2012 -0400

    drm/radeon: fixup tiling group size and backendmap on r6xx-r9xx (v4)
    
    Tiling group size is always 256bits on r6xx/r7xx/r8xx/9xx. Also fix and
    simplify render backend map. This now properly sets up the backend map
    on r6xx-9xx which should improve 3D performance.
    
    Vadim benchmarked also:
    Some benchmarks on juniper (5750), fullscreen 1920x1080,
    first result - kernel 3.4.0+ (fb21affa), second - with these patches:
    
    Lightsmark:   91 fps => 123 fps    +35%
    Doom3:        74 fps => 101 fps    +36%
    
    Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
    Signed-off-by: Jerome Glisse <jglisse@redhat.com>
    Signed-off-by: Dave Airlie <airlied@redhat.com>