When using multiscreen on the radeon driver, dpm is disabled. This means the adapter draws approx 35W more power due to no dynamic power management. While I would love to continue to use this card + radeon driver (which works perfectly in all other regards), the extra heat generated make this not an option. Multi-monitor configs are becoming more and more common - but they are almost unusable power / heat wise. While this is probably a pipe-dream - what are the chances of getting some form of power management that isn't just "severely cripple the card"?
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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