I had a similar effect on an AMILO Pi 2550 (Intel T8100 Core 2 Duo processor). The problem was not related to X, but seems to be caused by problems associated with deeper sleep states of the processors (BIOS bug?). Adding "processor.max_cstate=1" to the kernel boot parameters solved the issue.
I had a similar effect on an AMILO Pi 2550 (Intel T8100 Core 2 Duo processor). The problem was not related to X, but seems to be caused by problems associated with deeper sleep states of the processors (BIOS bug?). Adding "processor. max_cstate= 1" to the kernel boot parameters solved the issue.