[Bug 94387] Approx 35W more power usage in multi-screen

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=94387

--- Comment #5 from Steve <netwiz at crc.id.au> ---
Further digging in this BZ seems to show this as a similar problem to:
https://bugzilla.kernel.org/show_bug.cgi?id=60523

/sys/class/drm/card0/device $ cat power_dpm_force_performance_level
auto

/sys/class/drm/card0/device $ echo low > power_dpm_force_performance_level
-bash: echo: write error: Invalid argument

/sys/class/drm/card0/device $ cat power_dpm_force_performance_level
auto

/sys/class/drm/card0/device $ echo high > power_dpm_force_performance_level
-bash: echo: write error: Invalid argument

/sys/class/drm/card0/device $ echo auto > power_dpm_force_performance_level
-bash: echo: write error: Invalid argument

Video card is:
$ lspci -v -s 03:00.0
03:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Barts
XT [Radeon HD 6870] (prog-if 00 [VGA controller])
        Subsystem: Advanced Micro Devices, Inc. [AMD/ATI] Device 00d0
        Flags: bus master, fast devsel, latency 0, IRQ 37
        Memory at d0000000 (64-bit, prefetchable) [size=256M]
        Memory at fbcc0000 (64-bit, non-prefetchable) [size=128K]
        I/O ports at d000 [size=256]
        Expansion ROM at fbca0000 [disabled] [size=128K]
        Capabilities: [50] Power Management version 3
        Capabilities: [58] Express Legacy Endpoint, MSI 00
        Capabilities: [a0] MSI: Enable+ Count=1/1 Maskable- 64bit+
        Capabilities: [100] Vendor Specific Information: ID=0001 Rev=1 Len=010
<?>
        Capabilities: [150] Advanced Error Reporting
        Kernel driver in use: radeon
        Kernel modules: radeon

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