Re: Intel 7265 wireless performance unstable on Linux >= 3.19

[Ryan Finnie <ryan.finnie@canonical.com>]

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On 03/31/2015 02:15 AM, Emmanuel Grumbach wrote:
>> Please open a bug on bugzilla.kernel.org and CC
>> ilw@linux.intel.com to the bug. Attach your syslog output as
>> well.

Done: https://bugzilla.kernel.org/show_bug.cgi?id=95901

>> It seems that the supplicant is deauthenticating. What is your
>> supplicant version?

wpasupplicant 2.1-0ubuntu7 from Ubuntu vivid.  From the syslog output,
it appears the wpa_supplicant output is reacting to the kernel event,
with nothing relevant preceding it:

Mar 31 13:15:11 linda systemd[1]: Started Stop ureadahead data collection.
Mar 31 13:15:20 linda kernel: [   72.442153] wlan0: deauthenticating
from 38:2c:4a:5c:7f:e4 by local choice (Reason: 3=DEAUTH_LEAVING)
Mar 31 13:15:20 linda kernel: [   72.457967] cfg80211: Calling CRDA to
update world regulatory domain
Mar 31 13:15:20 linda wpa_supplicant[902]: wlan0:
CTRL-EVENT-DISCONNECTED bssid=38:2c:4a:5c:7f:e4 reason=3
locally_generated=1
Mar 31 13:15:20 linda NetworkManager[815]: <warn> Connection
disconnected (reason -3)

> One idea came through my mind. Can you try this?
> 
> diff --git a/drivers/net/wireless/iwlwifi/mvm/mac80211.c 
> b/drivers/net/wireless/iwlwifi/mvm/mac80211.c index
> 302c8cc..7c12c9f 100644 ---
> a/drivers/net/wireless/iwlwifi/mvm/mac80211.c +++
> b/drivers/net/wireless/iwlwifi/mvm/mac80211.c @@ -525,7 +525,7 @@
> int iwl_mvm_mac_setup_register(struct iwl_mvm *mvm) else 
> hw->wiphy->flags &= ~WIPHY_FLAG_PS_ON_BY_DEFAULT;
> 
> -       if (IWL_UCODE_API(mvm->fw->ucode_ver) >= 10) { +       if
> (IWL_UCODE_API(mvm->fw->ucode_ver) >= 10 && false) { 
> hw->wiphy->flags |= WIPHY_FLAG_SUPPORTS_SCHED_SCAN; 
> hw->wiphy->max_sched_scan_ssids = PROBE_OPTION_MAX; 
> hw->wiphy->max_match_sets = IWL_SCAN_MAX_PROFILES;

Sorry, it didn't appear to have any effect; DEAUTH_LEAVING would still
occur every ~60 seconds.

RF
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