When using ${diskio_readgraph} or ${diskio_writegraph} variables in .conkyrc application prints parse error: Conky: unknown variable diskio_readgraph Conky: unknown variable diskio_writegraph I found that diskiograh_read and diskiograph_write should be used instead. But in documentation (man and web pages) names of these variables are diskio_readgraph and diskio_writegraph/
fixed in 1.4.8. see bug 190839.
1.4.9 is going to get stabled