From mboxrd@z Thu Jan 1 00:00:00 1970
From: bugzilla-daemon@bugzilla.kernel.org
Subject: [Bug 78111] New: APU turbo core boost not working when radeon.dpm=1
Date: Mon, 16 Jun 2014 14:21:43 +0000
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https://bugzilla.kernel.org/show_bug.cgi?id=78111
Bug ID: 78111
Summary: APU turbo core boost not working when radeon.dpm=1
Product: Drivers
Version: 2.5
Kernel Version: 3.14.6
Hardware: x86-64
OS: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: Video(DRI - non Intel)
Assignee: drivers_video-dri@kernel-bugs.osdl.org
Reporter: bgz.marko@gmail.com
Regression: No
I am testing with A6-1450 APU on Arch Linux. If I pass radeon.dpm=1 parameter
at boot and start a single core workload then turbostat will report max
frequency of about 1000 MHz:
Core CPU Avg_MHz Bzy_MHz TSC_MHz time
- - 262 998 998 5**
0 0 12 998 998 5**
1 1 998 998 998
2 2 16 998 998
3 3 21 998 998
"cpupower frequency-info" reports that boost state support is supported, but
not active:
boost state support:
Supported: yes
Active: no
However, when dynamic power management is disabled (radeon.dpm=0), turbostat
reports higher frequencies for single core load, up to 1300 Mhz:
Core CPU Avg_MHz Bzy_MHz TSC_MHz time
- - 320 1214 998 5**
0 0 9 1226 998 5**
1 1 13 1194 998
2 2 41 1143 998
3 3 1216 1216 998
"cpupower frequency-info" confirms that boost is now active.
boost state support:
Supported: yes
Active: yes
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