Lm_sensors not reading gfx card temperature right

I have ran sensors-detect and lm_sensors still returns the following. radeon-pci-0100 Adapter: PCI adapter temp1: +511.0°C (crit = +120.0°C, hyst = +90.0°C) coretemp-isa-0000 Adapter: ISA adapter Physical id 0: +47.0°C (high = +87.0°C, crit = +105.0°C) Core 0: +46.0°C (high = +87.0°C, crit = +105.0°C) Core 1: +47.0°C (high = +87.0°C, crit = +105.0°C)