>>> Hello everyone. >>> >>> Thanks for releasing the carl9170 driver in the >>> compat-wireless package. >> I recommend using wireless-testing.git over >> compat-wireless + old kernel. >> >>> I have been able to compile the driver, so that is great. >>> The connection seems to be a bit inconsistent. >>> I get the following quite often in /var/log/messages : >> >>> kernel: ieee80211 phy9: channel change: 2472 -> 2462 failed (2) >> That's a noise floor calibration error. Check if your compat-wireless >> source includes "carl9170: reinit phy after HT settings have changed". >> Also check if there is another device active on the same (primary/ >> secondary) channel like a microwave oven, DECT phone or another wifi >> network, or wifi network peer. >> >>> kernel: ieee80211 phy9: invalid plcp cck rate (0) >> This is a known bug, the driver received a invalid stream frame >> from the hardware. This only happens a lot when the AP ignores >> the device's ampdu spacing. >> (Do you have an older draft-n AP, if so what chip?) >> >>> kernel: ieee80211 phy9: FW: MAC RESET >> The device failed to send pending data for more than 150ms(HT40) - 300ms, >> either because the medium was busy, or the AP failed to response at all >> mostly because it has crashed first. >> (check if your AP's TSF is no where near your AP's uptime) >> >>> When >>> that happens (which can be as often as every few minutes) my reported >>> connection speed in network manager drops to 6 or 1 Mb/s. The network >>> speed is noticeably reduced (for instance download speeds drastically >>> reduce, online videos stutter, or music streaming from a different >>> computer pauses, etc). >> Network manager has a feature called "background scanning". >> The advantage is that you'll always have a up-to-date site survey. >> The disadvantage is that it needs to perform a periodically scan >> (as in every few minutes) which on some occasions result in a >> channel change failed hiccup. >> >>> >>> My previous adapter TP-Link TL-WN721N (ath9k_htc driver) did not behave like this. >> Why did you go back to the previous generation? >> ath9k_htc (for AR9271) is in fact the replacement for AR9170. >> >> Regards, >> Chr > Thanks for your response. I chose the TL-WN821N because it seemed to have a 'better' feature set (faster speed, MIMO, etc) plus the carl9170 driver is supposed to capable of AP mode. (I have plans in the future of constructing a wireless router). So I thought I was improving (guess I'm wrong). I don't think there are any nearby networks on my channel. I purposely change it from default ( 6 ) to 11 (actually wide 9). The access point is a Linksys wrt120n (probably not the best, I know). To be honest, I don't know what a TSF is or how to check it. Thanks again, Dale -- 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
