ncv double DS name

[Thomas Bergauer]

hi!

i have hobbit running and my clients sending the server the  output of
the lm_sensor command to show temperatures and voltages of the
mainboard. The output looks basically like this:

as99127f-i2c-0-2d
Adapter: SMBus PIIX4 adapter at e800
VCore 1:   +2.05 V  (min =  +1.74 V, max =  +2.22 V)              
VCore 2:   +2.59 V  (min =  +2.24 V, max =  +2.74 V)              
+3.3V:     +3.50 V  (min =  +2.96 V, max =  +3.62 V)              
+5V:       +5.08 V  (min =  +4.49 V, max =  +5.48 V)              
+12V:     +11.67 V  (min =  +9.12 V, max = +13.62 V)              
-12V:     -11.57 V  (min = -14.37 V, max =  -9.60 V)              
-5V:       -5.23 V  (min =  -6.00 V, max =  -4.00 V)              
Cha Fan:  1940 RPM  (min =  664 RPM, div = 4)                     
P/S Fan:  2636 RPM  (min = 1328 RPM, div = 4)                     
temp1:       +27°C  (high =   +40°C, hyst =   +38°C)          
temp2:     +32.7°C  (high =   +52°C, hyst =   +47°C)          
vid:      +2.000 V  (VRM Version 8.2)


I have set up a custom rrd graph to plot these data. However, I am
getting the following error in the rrd-status.log:
RRD error creating /usr/lib/hobbit/data/rrd/server/sensors.rrd: Duplicate DS name: 12V

It seems that +12V and -12V are treated as a single name. how can I
avoid this problem?

thanks, Thomas