Hi Arturo, I cannot help for kernel, however, and you probably already know it: Several bios updates became available since 10/04/2007 version. Did you consider them ? (ie checking release logs) Will you try ?
See http://h20564.www2.hpe.com/hpsc/swd/public/detail?swItemId=MTX_1304cdfaf92247a1836bac775b#tab-history RECOMMENDED * Systems ROMPaq Firmware Upgrade for HP ProLiant DL380 G5 (P56) Servers Type: BIOS (Entitlement Required) - System ROM Version: 2015.08.16 (A)(1 Oct 2015) Cheers, Franck