[Bug 81021] AMD CPUs w/ Integrated Graphics (APUs) And Turbo Core Only Boost If "fglrx" Module Is Loaded

bugzilla-daemon at bugzilla.kernel.org bugzilla-daemon at bugzilla.kernel.org
Thu Aug 7 02:43:32 PDT 2014


--- Comment #10 from LiNuxXer <andre.d at gmx.net> ---
(In reply to Alex Deucher from comment #8)
> I'm not sure why you don't think you need a GPU driver installed.  When the
> driver is installed it not only allows the GPU to dynamically adjust it
> clocks and voltages up for performance, but also enables low power states
> and turns off certain blocks when they are not in use, so overall, you'll
> probably save more power with the GPU driver loaded than just leaving the
> GPU in the state set up by the bios.

1) You're absolutely right. radeon outperforms fglrx significantly in console
mode (in my case 10W up to 12W when disabling the output) (and not to mention
the Turbo Core performance which is much smoother).

2) You inspired me to look at all this more systematically. I have posted my
detailed results at http://unix.stackexchange.com/a/148918/79761 -- in short,
the radeon driver is an excellent piece of software (and is in fact saving my
*** regarding processor choice, applying the bapm enabling patch you proposed).

3) One question remains -- can't bapm enabling become at least a parameter? Or
is it already?

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