John Robinson wrote: > On 22/03/2009 14:56, Francesco Bochicchio wrote: > [...] >> For a while, I suspected CPU >> clock-stepping : with stock-kernel, the default was about 650 MHz, while >> with my kernel and stepping disabled is fixed at 1 GHz . I thought that >> maybe playing a video would require the kernel to increase CPU frequency >> and that did not >> work because of some weird difference between intel CPU and VIA CPU. >> However, this should happen also with >> non-accelerated X driver (even more so), and instead that was fine. > > Other way round, I think - with the acceleration available, the CPU can > drop its frequency during playback, which isn't possible with the > non-accelerated driver. I know this used to cause a problem (in that the > speed change sometimes locked up when there was a lot of I/O going on) > but I thought it had long since been fixed - or maybe the Fedora/CentOS > kernels I've used have just had it disabled for all this time. > I think it was never really fixed and the support is disabled by default. Grep for CONFIG_X86_LONGHAUL in your kernel config.
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