Andreas Hartmann wrote: > Helmut Schaa wrote: >> On Fri, May 18, 2012 at 6:21 PM, Tobias Diedrich <ranma@xxxxxxxxxxxx> wrote: >>>> So, maybe we should do it the safe way and just register a safe default >>>> of 20dBm for all channels? >>> >>> AFAIU that would cap you to 20dBm even if you are in a country that >>> has higher limits (e.g. 27dBm in the US?). >> >> Not necessarily because the driver won't allow tx power adjustments at all >> if EEPROM_EIRP_MAX_TX_POWER is unused. > > This means: > Tx settings in cfg80211 as given by "iw reg get" e.g. are ignored > completely as long as EEPROM_EIRP_MAX_TX_POWER is unused. > Thus it is more or less chance that the device actually uses the allowed > / correct Tx power at all. Maybe it's too high or too low. Both would be > bad. Please Helmut, I would be really grateful if you could confirm or negate my conclusion. >> For these devices we cannot rely on the tx power output at all and maybe >> it makes sense to register a max power of 0 just to tell mac80211/cfg80211 >> that no tx power adjustments are possible on these devices? > > Hmmm, this sounds really strange. How can I see if a device uses > EEPROM_EIRP_MAX_TX_POWER at all? > It would be good to have a log entry, telling the user that the Tx power > of the device can't be adjusted at all and therefore it is possible, > that the operation of the device might be illegal in the current country > even if cfg80211 is set correctly. Thank you Helmut, kind regards, Andreas -- 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
