Mailinglist Archive: radeonhd (426 mails)

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Re: [radeonhd] [PATCH] PM patches: logic fix, feature, cleaning, memory downclocking
  • From: "David C. Rankin" <drankinatty@xxxxxxxxxxxxxxxxxx>
  • Date: Fri, 29 May 2009 11:58:06 -0500
  • Message-id: <4A20141E.4070507@xxxxxxxxxxxxxxxxxx>
Rafał Miłecki wrote:
2009/5/29 David C. Rankin, J.D.,P.E. <drankinatty@xxxxxxxxxxxxxxxxxx>:

That's what I needed to know. I'm am not familiar with 'git' and the

git checkout -t -b downclocking origin/master
git am ~/archlinux/radeonhd/patches/*patch

parts were the parts I knew nothing about. I'll pull the patches, apply and
report back. Something really has to give here. The heat is unbearable. To
get the actual temp data, I have a digital multimeter with a great surface
temperature probe on it ( Craftsman Model No. 82400 ) and I took the
temperature readings on the left palm rest and left fan discharge of my
laptop with the radeonhd driver active. The results:

Left Palm Rest Temp: 96 Deg. F

Left Fan Discharge: 147 Deg. F

The inside of this box is cooking.... That's with:

Option "ForceLowPowerMode"
Option "LowPowerModeEngineClock" "140000"

I'll keep my fingers crossed and report back.

Nice, tests with your multimeter would be absolutely great. You may
also try to reduce EngineClock later. For example change it from
140000 to 120000. If it doesn't cause any corruptions you can still
try decreasing that. Don't worry about values you may use 139999,
139998, 139997, end so on.AtomBIOS will round it to something


I have created a baseline temperature comparison for testing purposes.
It is
located at:

Here is the baseline:

Temperature Comparison
Between the ATI/fglrx driver
and OSS radeonhd driver


Toshiba P205D; AMD Turion(tm) 64 X2 Mobile Technology TL-58
ATI Technologies Inc RS690M [Radeon X1200 Series]

Driver/Operating Systems:

fglrx (Ver. 8.532; 8-9 Release) - openSuSE 11.0; KDE3; Compiz

radeonhd - Archlinux; KDE3; Compiz

git checkout -t -b downclocking origin/master
git am patches/*patch
vi src/rhd_pm.c (set: #if 1)
Log confirmation:

(II) RADEONHD: version 1.2.5, built from git branch downclocking,
commit 0de8b484 + changes

Operating Temperatures:

fglrx - openSuSE

Left Palm Rest Temp: 89 Deg. F

Left Fan Discharge: 122 Deg. F

radeonhd - Archlinux

Left Palm Rest Temp: 96 Deg. F

Left Fan Discharge: 147 Deg. F

David C. Rankin, J.D.,P.E.
Rankin Law Firm, PLLC
510 Ochiltree Street
Nacogdoches, Texas 75961
Telephone: (936) 715-9333
Facsimile: (936) 715-9339
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