On my TURKS chip (HD 6750M) the radeon_pm_print_states() output shows that I
should be using POWER_STATE_TYPE_POWERSAVE instead of POWER_STATE_TYPE_BATTERY.

I don't know if this is true for all TURKS chips or what other chips are
affected, but the following patch against 3.9-rc5 fixes power profiles on my
MacBookPro8,2.

diff -ruN linux-3.9-rc5.orig/drivers/gpu/drm/radeon/evergreen.c
linux-3.9-rc5/drivers/gpu/drm/radeon/evergreen.c

--- linux-3.9-rc5.orig/drivers/gpu/drm/radeon/evergreen.c       2013-03-31
15:12:43.000000000 -0700
+++ linux-3.9-rc5/drivers/gpu/drm/radeon/evergreen.c    2013-04-05
17:45:04.179779729 -0700
@@ -343,7 +343,9 @@
         * MH and SH.  Difference is that we always use the high clock index
for
         * mclk.
         */
-       if (rdev->flags & RADEON_IS_MOBILITY)
+       if ((rdev->flags & RADEON_IS_MOBILITY) && (rdev->family == CHIP_TURKS))
+               idx = radeon_pm_get_type_index(rdev,
POWER_STATE_TYPE_POWERSAVE, 0);
+       else if (rdev->flags & RADEON_IS_MOBILITY)
                idx = radeon_pm_get_type_index(rdev, POWER_STATE_TYPE_BATTERY,
0);
        else
                idx = radeon_pm_get_type_index(rdev,
POWER_STATE_TYPE_PERFORMANCE, 0);