I am trying to resolve some wireless issue with a laptop running F14,
and I need to change the "sens" (i.e. Sensitivity) value for the
wireless interface.
However when trying to run the following command as root it fails:
iwconfig wlan0 sens -65
gives output:
Error for wireless request "Set Sensitivity" (8B08) :
SET failed on device wlan0 ; Operation not supported.
and yet the command "man iwconfig" gives for this section:
sens Set the sensitivity threshold. This define how sensitive is the
card to poor operating conditions (low signal, interference).
Positive values are assumed to be the raw value used by the
hardware or a percentage, negative values are assumed to be dBm.
Depending on the hardware implementation, this parameter may
control various functions.
On modern cards, this parameter usually control handover/roaming
threshold, the lowest signal level for which the hardware
remains associated with the current Access Point. When the sigâ
nal level goes below this threshold the card starts looking for
a new/better Access Point. Some cards may use the number of
missed beacons to trigger this. For high density of Access
Points, a higher threshold make sure the card is always associâ
ated with the best AP, for low density of APs, a lower threshold
minimise the number of failed handoffs.
On more ancient card this parameter usually controls the defer
threshold, the lowest signal level for which the hardware conâ
siders the channel busy. Signal levels above this threshold make
the hardware inhibits its own transmission whereas signals
weaker than this are ignored and the hardware is free to transâ
mit. This is usually strongly linked to the receive threshold,
the lowest signal level for which the hardware attempts packet
reception. Proper setting of these thresholds prevent the card
to waste time on background noise while still receiving weak
transmissions. Modern designs seems to control those thresholds
automatically.
Example :
iwconfig eth0 sens -80
iwconfig eth0 sens 2
So the command should work according to the man command section above.
Can someone tell me if there is some workaround for this or is this a bug?
I have already reported as https://bugzilla.redhat.com/show_bug.cgi?id=677008
--
mike c
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