I have a special server that is going to be used for graphics processing. It has multiple ATI Radeon GPU cards inside it.
Now when I install Ubuntu server straight from CD it runs relatively cool. There is no graphics, it's just the console.
Now I've compiled a DomU kernel and after I start the machine with that kernel the machine fans start spinning up (where they were nearly silent previously) and the machine is running significantly hotter. In fact it's heating up my little room here like a fan heater!
Is there a setting in the Linux kernel source that could be causing this? Much heat seems to be coming from the graphics cards.