Re: enable i915 rc6 save 7 watt on kernel 3.2
On Thu, Jan 19, 2012 at 01:05:13PM +0100, Martin Steigerwald wrote:
> > wei@Tungsten:~$ dmesg|grep -i aspm
> > [ 0.000000] Command line: BOOT_IMAGE=/boot/vmlinuz-3.2.1
> > root=UUID=ed888aee-0822-4303-8bea-18f0fbf9ba3a ro quiet pcie_aspm=force
> > threadirqs
> > [ 0.000000] Kernel command line: BOOT_IMAGE=/boot/vmlinuz-3.2.1
> > root=UUID=ed888aee-0822-4303-8bea-18f0fbf9ba3a ro quiet pcie_aspm=force
> > threadirqs
> > [ 0.000000] PCIe ASPM is forcibly enabled
> > [ 0.460586] ACPI FADT declares the system doesn't support PCIe ASPM,
> > so disable it
> > [ 0.582432] ACPI _OSC control for PCIe not granted, disabling ASPM
>
> Well AFAIR the second message is overridden by the first one in that case.
> Would have to lookup the details from some Phoronix articles by Michael
> Larabel or some other sources or the linux kernel source.
good to know. any chance it may cause hardware damage on unsupported
BIOS?
>
> > > while games and compositing managers use a different and larger set
> > > of OpenGL. There are some benchmarks at Phoronix that show increased
> > > framerates. One suggested explaination there is that due to the
> >
> > they are over several hundred MB. Is there any small and simple graphic
> > test tool like glxgreas?
>
> Well what exactly do you want to test and why?
not long ago on this list, when I mentioned glxgears score, I was
suggested to benchmarking by flightgears, which is also several hundred
MB. I am simply curious why graphic test suits are all so big.
Although T520 is overkill for google earth(constant blinking, but it is
another story), the most graphic demanding apps I use, I have a strong
feeling that higher graphic score on the same hardware could means more
efficient way of using GPU, therefore possible lower power usage when
running non graphical intense apps, hence longer battery life. My
feeling, well, is just feeling, since the power meter shows regardless
the glxgears score, the typical desktop usage use almost same amount of
power under different kernel. Anyway, it is always good to know that
more juice can be squeezed out of the same hardware, isn't it?
--
Chen Wei
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