Comment # 5
on bug 94387
from Steve
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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