Comment 5 for bug 1651981

I sent the patch to <email address hidden>.

Result of bisection:

# bad: [bafa160b3ae93a4d6f6989e6b32bc4d06b56be31] UBUNTU: Ubuntu-4.8.0-31.33
# good: [4b87663a746d13120384360f7e6129fd2828b485] UBUNTU: Ubuntu-4.8.0-30.32
git bisect start 'Ubuntu-4.8.0-31.33' 'Ubuntu-4.8.0-30.32'
# bad: [63d1d029bf41f625ee23888484815acbbf88afd7] mmc: sdhci: Fix CMD line reset interfering with ongoing data transfer
git bisect bad 63d1d029bf41f625ee23888484815acbbf88afd7
# good: [c4f21d2d45d0d390a5510d0128d7c03c0f4bdc56] mac80211: discard multicast and 4-addr A-MSDUs
git bisect good c4f21d2d45d0d390a5510d0128d7c03c0f4bdc56
# bad: [992733430c9d7ea2fd1eebe6c5e5f1c667b0e9e7] net: Add netdev all_adj_list refcnt propagation to fix panic
git bisect bad 992733430c9d7ea2fd1eebe6c5e5f1c667b0e9e7
# bad: [c098aeb56ee8bd422bcf416eb1a32f2ef3aeddcb] drm/i915/fbc: fix CFB size calculation for gen8+
git bisect bad c098aeb56ee8bd422bcf416eb1a32f2ef3aeddcb
# good: [67ef4bbe62cd7eb46d9b4f8c4ecbab9c05c6da27] drm/radeon/si_dpm: Limit clocks on HD86xx part
git bisect good 67ef4bbe62cd7eb46d9b4f8c4ecbab9c05c6da27
# bad: [9b326d0d38ca7ba837eaa1ea20f0025c566c8005] drm/fb-helper: Keep references for the current set of used connectors
git bisect bad 9b326d0d38ca7ba837eaa1ea20f0025c566c8005
# bad: [74980b9e4b15a5228db4ac01b9e07c7e063b3b88] drm/nouveau/acpi: fix check for power resources support
git bisect bad 74980b9e4b15a5228db4ac01b9e07c7e063b3b88
# bad: [cd8ae00ac77adbe3d00702daad77608aecceb77a] drm/radeon: drop register readback in cayman_cp_int_cntl_setup
git bisect bad cd8ae00ac77adbe3d00702daad77608aecceb77a
# bad: [9cc4fd5b9fbb0d74e77c81521da1e2fe712f6787] drm/radeon/si_dpm: workaround for SI kickers
git bisect bad 9cc4fd5b9fbb0d74e77c81521da1e2fe712f6787
# first bad commit: [9cc4fd5b9fbb0d74e77c81521da1e2fe712f6787] drm/radeon/si_dpm: workaround for SI kickers