Comment 40 for bug 1442411

Okay, afcee962b09842d0f4191beb4a2d08251b4c7705 seems to fix this problem:

https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=afcee962b09842d0f4191beb4a2d08251b4c7705

I cherry-picked it into the current ubuntu-vivid.git tree and built a kernel, and have had no problems so far.

It's only a one line change:

diff --git a/drivers/net/wireless/iwlwifi/mvm/coex_legacy.c b/drivers/net/wireless/iwlwifi/mvm/coex_legacy.c
index d530ef3..85144d5 100644
--- a/drivers/net/wireless/iwlwifi/mvm/coex_legacy.c
+++ b/drivers/net/wireless/iwlwifi/mvm/coex_legacy.c
@@ -1176,7 +1176,7 @@ bool iwl_mvm_bt_coex_is_ant_avail_old(struct iwl_mvm *mvm, u8 ant)
 bool iwl_mvm_bt_coex_is_shared_ant_avail_old(struct iwl_mvm *mvm)
 {
  u32 ag = le32_to_cpu(mvm->last_bt_notif_old.bt_activity_grading);
- return ag == BT_OFF;
+ return ag < BT_HIGH_TRAFFIC;
 }

 bool iwl_mvm_bt_coex_is_tpc_allowed_old(struct iwl_mvm *mvm,