[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 #4 from Steve <netwiz at crc.id.au> ---
I've been digging more into this.... I have 3 x displays - 2 x DVI, 1 x DP.

Looking into debugfs, I can see that the clocks never change from sclk 900MHz,
mclk: 105000.

ie:
# cat /sys/kernel/debug/dri/64/radeon_pm_info
uvd    vclk: 0 dclk: 0
power level 2    sclk: 90000 mclk: 105000 vddc: 1175 vddci: 1150

My kernel options are:
# for i in /sys/class/drm/card0/device/power_*; do echo "$i: `cat $i`"; done
/sys/class/drm/card0/device/power_dpm_force_performance_level: auto
/sys/class/drm/card0/device/power_dpm_state: balanced
/sys/class/drm/card0/device/power_method: dpm
/sys/class/drm/card0/device/power_profile: default

# for i in /sys/module/radeon/parameters/*; do echo "$i: `cat $i`"; done
/sys/module/radeon/parameters/agpmode: 0
/sys/module/radeon/parameters/aspm: -1
/sys/module/radeon/parameters/audio: 0
/sys/module/radeon/parameters/auxch: -1
/sys/module/radeon/parameters/backlight: -1
/sys/module/radeon/parameters/bapm: -1
/sys/module/radeon/parameters/benchmark: 0
/sys/module/radeon/parameters/connector_table: 0
/sys/module/radeon/parameters/deep_color: 0
/sys/module/radeon/parameters/disp_priority: 0
/sys/module/radeon/parameters/dpm: -1
/sys/module/radeon/parameters/dynclks: -1
/sys/module/radeon/parameters/fastfb: 0
/sys/module/radeon/parameters/gartsize: 1024
/sys/module/radeon/parameters/hard_reset: 0
/sys/module/radeon/parameters/hw_i2c: 0
/sys/module/radeon/parameters/lockup_timeout: 10000
/sys/module/radeon/parameters/modeset: 1
/sys/module/radeon/parameters/msi: -1
/sys/module/radeon/parameters/mst: 0
/sys/module/radeon/parameters/no_wb: 0
/sys/module/radeon/parameters/pcie_gen2: -1
/sys/module/radeon/parameters/r4xx_atom: 0
/sys/module/radeon/parameters/runpm: -1
/sys/module/radeon/parameters/test: 0
/sys/module/radeon/parameters/tv: 0
/sys/module/radeon/parameters/use_pflipirq: 2
/sys/module/radeon/parameters/vm_block_size: 12
/sys/module/radeon/parameters/vm_size: 8
/sys/module/radeon/parameters/vramlimit: 0

# cat /proc/cmdline
BOOT_IMAGE=/boot/vmlinuz-4.4.3-300.fc23.x86_64
root=UUID=03ee98ed-d998-4518-b216-b77822a9319b ro quiet radeon.audio=0
radeon.tv=0 audit=0 selinux=0

# cat /proc/version
Linux version 4.4.3-300.fc23.x86_64
(mockbuild at bkernel01.phx2.fedoraproject.org) (gcc version 5.3.1 20151207 (Red
Hat 5.3.1-2) (GCC) ) #1 SMP Fri Feb 26 18:45:40 UTC 2016

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