Zabbix sensor 'no data'

I’m having problems with monitoring my GPU temperature.

There’s list of my sensors: sensors -u

acpitz-virtual-0
Adapter: Virtual device
temp1:
  temp1_input: 65.500
  temp1_crit: 99.000

...

coretemp-isa-0000
Adapter: ISA adapter
Physical id 0:
  temp1_input: 65.000
  temp1_max: 86.000
  temp1_crit: 100.000
  temp1_crit_alarm: 0.000

...

I’ve created application temperature with two keys:

• sensor[coretemp-isa-0000,temp3] for monitoring CPU, which works well
• sensor[acpitz-virtual-0,temp1] for monitoring GPU, which doesn’t collect any data.

CPU temperature shows in Monitoring -> Latest Data section and it’s data is avaliable in the graphs, whereas GPU temperature is absent in mentioned section and instead of statistics I see [no data] note below chart.

I have no idea why it’s not working, because zabbix_get -s 127.0.0.1 -k sensor[acpitz-virtual-0,temp1] gives me nice output: 61.500000.

I’ve also tried to increase StartHTTPPollers in zabbix_server.conf, but it didn’t help.

All I’ve found in zabbix_server.log and zabbix_agent.log is:

13919:20150901:231222.255 item [Zabbix server:sensor[acpitz-virtual-0,temp1]] became not supported: Received value [61.5] is not suitable for value type [Numeric (unsigned)] and data type [Decimal]

I’ve changed both fields from Decimal to Float, but CPU still works and GPU still doesn’t…