[BUG] QWLE900V5-18 - cannot achievie 3 spatial streams link

Tomasz Tajmajer tt at elnovel.com
Thu Dec 12 06:42:05 EST 2013

On 11.12.2013 20:51, Janusz Dziedzic wrote:
>> Seems from driver we configure everything correctly. Rate Control is
>> in FW - so FW will decide what NSS/MCS to use. Here we see our devices
>> works fine with 3x3.
>> BTW.
>> You can try to use fixed_rate setting. You will have to apply some
>> patches from mac80211-next/group:
>> Kernel:
>> 1) nl80211: don't clear bitrate_mask twice
>> 2) nl80211: back to default bitrate_mask correctly
>> 3) nl80211/cfg80211: bitrate_mask, rename mcs to ht_mcs
>> 4) nl80211: add VHT support for set_bitrate_mask
>> 5) ath10k: add set_bitrate_mask callback - this I will send in few minutes
>> iw:
>> 1) iw: add VHT MCS/NSS set support to set bitrates
>> After that just run ap and: iw wlanX set bitrates legacy-5 ht-mcs-5
>> vht-mcs-5 3:0
>> You should send frames from AP with NSS=3, MCS=0
> BTW Do you have same problem with HT, or only with VHT?
> BR
> Janusz

For HT 3x3 MIMO is working fine. The issue occurs only for VHT.

Thank you for your suggestions, I'll apply the patches and try to force 
3 spatial streams manually. Hope it will work.

BTW: Which firmware and driver versions you were using in your tests ?


More information about the ath10k mailing list