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

[bugzilla-daemon@bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=81021

--- Comment #6 from Alex Deucher <alexdeucher@gmail.com> ---
(In reply to LiNuxXer from comment #5)
> 
> This bug report here is about Linux not supporting Turbo Core on APUs when
> no specific graphics driver is used.
> 
> In other words, I'm raising the question whether the kernel should be able
> to suipport the APU Turbo Core even without any specific graphics driver.
> 

Turbo Core (bapm) is controlled by a microcontroller on the APU.  The same
microcontroller also manages the GPU power management.  On most APU systems,
turbo core is enabled by default by the sbios, but apparently on your system
it's not.  Maybe there is a bios option to enable it by default on your system.
 When the GPU driver loads and sets up the GPU power management, it can also
enable or disable bapm.  When bapm and GPU power mangement (dynamic GPU engine
clock and voltage scaling, clock and powergating, etc.) are both enabled, some
systems have stability problems (sudden reboots, hangs, graphical corruption,
issues when switching between AC and battery).

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