https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=194966
Bug ID: 194966
Summary: Radeon KMS driver lack power and clocks management
support
Product: Base System
Version: 10.1-RC2
Hardware: Any
OS: Any
Status: Needs Triage
Severity: Affects Many People
Priority: ---
Component: kern
Assignee: [email protected]
Reporter: [email protected]
Created attachment 149319
--> https://bugs.freebsd.org/bugzilla/attachment.cgi?id=149319&action=edit
Patch /sys/dev/drm2/. radeonkms driver change device sclk and mclk when
initializing according to drm.force_sclk and drm.force_mclk loader.conf
tuneables
Radeon KMS driver initialize hardware in default 'performance' mode, which
cause significant noise and power consumption.
Following patch adds rudimentary support of engine/memory clocks management.
Immediately after initialization driver looks at value of drm.force_sclk and
drm.force_mclk variables (tuneable via loader.conf). If non-zero value
specified driver call radeon_set_engine_clock()/radeon_set_memory_clock() to
adjust clocks setting.
Boundary checks are not performed, it should be used with care!
Actually it would be significantly better to add direct support of
clocks/voltage values by `sysctl` on the fly, not only via loader.conf as in
proposed patch.
Patch was tested, values (in MHz)
drm.force_sclk=250
drm.force_mclk=250
reduce noise of card fan very noticeable.
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