On Sat, May 24, 2014 at 6:04 PM, John Walker <john@xxxxxxxx> wrote: > > Hi Wireless Development > > I hope you can help.A bug seems to have been introduced in 3.10.34ish > (3.10.32 is ok) linux kernel where a statically compiled regulator > db.txt file does not set max_erip /tx_power correctly. > > It was first noticed that the power output of a RaspberyPi hostapd AP > was only outputting -55dBm, while previously it was at -30dbm. This > was measured with a phone app, wifi analyzer at 1 m distance. > > Any post 3.10.33 & late 3.12 kernels show the following when cfg80211 > is loaded. One can see that the max_erip is not set: > > cfg80211: Calling CRDA to update world regulatory domain > cfg80211: World regulatory domain updated: > cfg80211: (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp) > cfg80211: (2402000 KHz - 2472000 KHz @ 0 KHz), (2000 mBi, 0 mBm) > cfg80211: (2457000 KHz - 2482000 KHz @ 0 KHz), (2000 mBi, 0 mBm) > cfg80211: (2474000 KHz - 2494000 KHz @ 20000 KHz), (2000 mBi, 0 mBm) > cfg80211: (5170000 KHz - 5250000 KHz @ 160000 KHz), (2000 mBi, 0 mBm) > cfg80211: (5250000 KHz - 5330000 KHz @ 160000 KHz), (2000 mBi, 0 mBm) > cfg80211: (5490000 KHz - 5730000 KHz @ 160000 KHz), (2000 mBi, 0 mBm) > cfg80211: (5735000 KHz - 5835000 KHz @ 80000 KHz), (2000 mBi, 0 mBm) > cfg80211: (57240000 KHz - 63720000 KHz @ 2160000 KHz), (N/A, 0 mBm) > cfg80211: Calling CRDA for country: GB > cfg80211: Regulatory domain changed to country: GB > cfg80211: (start_freq - end_freq @ bandwidth), (max_antenna_gain, max_eirp) > cfg80211: (2402000 KHz - 2482000 KHz @ 40000 KHz), (2000 mBi, 0 mBm) > cfg80211: (5170000 KHz - 5250000 KHz @ 80000 KHz), (2000 mBi, 0 mBm) > cfg80211: (5250000 KHz - 5330000 KHz @ 80000 KHz), (2000 mBi, 0 mBm) > cfg80211: (5490000 KHz - 5710000 KHz @ 80000 KHz), (2700 mBi, 0 mBm) > cfg80211: (57240000 KHz - 65880000 KHz @ 2160000 KHz), (4000 mBi, 0 mBm) > > iw list shows: > [snip] > Frequencies: > * 2412 MHz [1] (0.0 dBm) > * 2417 MHz [2] (0.0 dBm) > * 2422 MHz [3] (0.0 dBm) > * 2427 MHz [4] (0.0 dBm) > * 2432 MHz [5] (0.0 dBm) > * 2437 MHz [6] (0.0 dBm) > * 2442 MHz [7] (0.0 dBm) > * 2447 MHz [8] (0.0 dBm) > * 2452 MHz [9] (0.0 dBm) > * 2457 MHz [10] (0.0 dBm) > * 2462 MHz [11] (0.0 dBm) > * 2467 MHz [12] (0.0 dBm) > * 2472 MHz [13] (0.0 dBm) > * 2484 MHz [14] (disabled) > > iw reg get shows: > (3.12.20) > country GB: DFS-UNSET > (2402 - 2482 @ 40), (20, 0) > (5170 - 5250 @ 80), (20, 0) > (5250 - 5330 @ 80), (20, 0) > (5490 - 5710 @ 80), (27, 0) > (57240 - 65880 @ 2160), (40, 0) > > When I've returned to a 3.10.32 kernel, the tx output power is > restored to -30dBm, all the cfg80211 and iw list values are restored. > I've also tested an old db.txt file from the start of the year against > 3.12.19, but it makes no difference. > > iw list from 3.10.32 > [snip] > Frequencies: > * 2412 MHz [1] (20.0 dBm) > * 2417 MHz [2] (20.0 dBm) > * 2422 MHz [3] (20.0 dBm) > * 2427 MHz [4] (20.0 dBm) > * 2432 MHz [5] (20.0 dBm) > * 2437 MHz [6] (20.0 dBm) > * 2442 MHz [7] (20.0 dBm) > * 2447 MHz [8] (20.0 dBm) > * 2452 MHz [9] (20.0 dBm) > * 2457 MHz [10] (20.0 dBm) > * 2462 MHz [11] (20.0 dBm) > * 2467 MHz [12] (20.0 dBm) > * 2472 MHz [13] (20.0 dBm) > * 2484 MHz [14] (disabled) > > iw reg get > country GB: DFS-UNSET > (2402 - 2482 @ 40), (N/A, 20) > (5170 - 5250 @ 80), (N/A, 20) > (5250 - 5330 @ 80), (N/A, 20), DFS > (5490 - 5710 @ 80), (N/A, 27), DFS > (57240 - 65880 @ 2160), (N/A, 40), NO-OUTDOOR > > > The iw version is 3.14 > > I hope you can help, and many thanks > This happens when we use the latest db.txt, its format is changed. Please use the below patch from Luis. https://dev.openwrt.org/browser/trunk/package/kernel/mac80211/patches/005-make-genregdb.awk-skip-antenna-gain.patch?rev=40296 -- Thanks, Regards, Chaitanya T K. -- To unsubscribe from this list: send the line "unsubscribe linux-wireless" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
