Bug 94387

DPM works with multi-monitor.  What chip are you using?  Please attach your xorg log and dmesg output.

Created attachment 122105 [details]
dmesg output

You are right - I notice:
[    3.055513] [drm] Loading BARTS Microcode
[    3.055579] [drm] Internal thermal controller with fan control
[    3.061488] [drm] radeon: dpm initialized

This is interesting - as the fan sure works harder under the radeon driver than the fglrx - and you can feel the extra heat coming out the back of the card.

Is there any further information I can supply re power levels on the card to try and see what causes the extra power / heat usage?

Created attachment 122106 [details]
Xorg.0.log as requested

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@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

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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