Hi there,
my switch from Polaris (RX 570) to RDNA2 (RX 6800) has increased my idle (Gnome Desktop) total power usage by ~30 Watts in Linux. With default auto fan control this causes the fans to periodically stop and ramp up again every few minutes, because the card generates too much heat to keep the fans turned off permanently.
In Windows 10 Desktop power usage is 35-40 Watts lower than on my Linux Desktop, so the hardware is definitely capable of running more power efficient. All power usage was measured at the wall plug.
I'm running Ubuntu 20.04 with Kernel 5.11 (hwe-edge) and kisak-mesa. Only a single monitor is attached via DP.
Manually setting /sys/class/drm/card0/device/power_dpm_force_performance_level to "low" used to improve things on Polaris, but doesn't have any measurable effect on my RDNA2 card:
This raises a lot of questions: Is this a known issue due to the early state of the drivers or is this behavior caused by a bug? Is there any way to make idle power usage comparable to Windows? Are there improvements in newer Kernels?
I am really happy with 3D (Vulkan) performance and system stability, but the power draw in idle is unfortunate and makes me regret not paying attention to this before my purchase. On the other hand, while it's a common test in Windows based reviews, the information available on graphics cards idle power usage in Linux is really sparse.
I'd be really grateful for any hints on how to improve idle power usage. At least suspend to RAM is working fine, so I'll be using that a lot...
my switch from Polaris (RX 570) to RDNA2 (RX 6800) has increased my idle (Gnome Desktop) total power usage by ~30 Watts in Linux. With default auto fan control this causes the fans to periodically stop and ramp up again every few minutes, because the card generates too much heat to keep the fans turned off permanently.
In Windows 10 Desktop power usage is 35-40 Watts lower than on my Linux Desktop, so the hardware is definitely capable of running more power efficient. All power usage was measured at the wall plug.
I'm running Ubuntu 20.04 with Kernel 5.11 (hwe-edge) and kisak-mesa. Only a single monitor is attached via DP.
Manually setting /sys/class/drm/card0/device/power_dpm_force_performance_level to "low" used to improve things on Polaris, but doesn't have any measurable effect on my RDNA2 card:
Code:
# cat /sys/kernel/debug/dri/0/amdgpu_pm_info GFX Clocks and Power: 1000 MHz (MCLK) 0 MHz (SCLK) 1825 MHz (PSTATE_SCLK) 1000 MHz (PSTATE_MCLK) 6 mV (VDDGFX) 33.0 W (average GPU) GPU Temperature: 47 C GPU Load: 0 % MEM Load: 0 % SMC Feature Mask: 0x00003762a37f7dff VCN: Disabled Clock Gating Flags Mask: 0x38118305 Graphics Fine Grain Clock Gating: Off Graphics Medium Grain Clock Gating: On Graphics Medium Grain memory Light Sleep: Off Graphics Coarse Grain Clock Gating: On Graphics Coarse Grain memory Light Sleep: Off Graphics Coarse Grain Tree Shader Clock Gating: Off Graphics Coarse Grain Tree Shader Light Sleep: Off Graphics Command Processor Light Sleep: Off Graphics Run List Controller Light Sleep: Off Graphics 3D Coarse Grain Clock Gating: On Graphics 3D Coarse Grain memory Light Sleep: Off Memory Controller Light Sleep: On Memory Controller Medium Grain Clock Gating: On System Direct Memory Access Light Sleep: Off System Direct Memory Access Medium Grain Clock Gating: Off Bus Interface Medium Grain Clock Gating: Off Bus Interface Light Sleep: Off Unified Video Decoder Medium Grain Clock Gating: Off Video Compression Engine Medium Grain Clock Gating: Off Host Data Path Light Sleep: On Host Data Path Medium Grain Clock Gating: On Digital Right Management Medium Grain Clock Gating: Off Digital Right Management Light Sleep: Off Rom Medium Grain Clock Gating: Off Data Fabric Medium Grain Clock Gating: Off VCN Medium Grain Clock Gating: Off Host Data Path Deep Sleep: Off Host Data Path Shutdown: Off Interrupt Handler Clock Gating: On JPEG Medium Grain Clock Gating: Off Address Translation Hub Medium Grain Clock Gating: On Address Translation Hub Light Sleep: On
I am really happy with 3D (Vulkan) performance and system stability, but the power draw in idle is unfortunate and makes me regret not paying attention to this before my purchase. On the other hand, while it's a common test in Windows based reviews, the information available on graphics cards idle power usage in Linux is really sparse.
I'd be really grateful for any hints on how to improve idle power usage. At least suspend to RAM is working fine, so I'll be using that a lot...
Comment