On or about Friday 29 May 2009 at approximately 00:01:26 Rafał Miłecki composed:

2009/5/29 David C. Rankin, J.D.,P.E. :

...

Rafał,

       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 acceptable.

-- Rafał Miłecki

Rafał, (also cc'ed to archlinux list for those interested) Here is a quick Summary of what I did: 23:54 alchemy:~/archlinux/apps/radeonhd> git checkout -t -b downclocking origin/master Branch downclocking set up to track remote branch master from origin. Switched to a new branch 'downclocking' 23:55 alchemy:~/archlinux/apps/radeonhd> git am patches/*patch Applying: PM: fix broken engine clock setting logic /home/david/archlinux/apps/radeonhd/.git/rebase-apply/patch:30: trailing whitespace. "calculated engine clock at %ldHz\n", warning: 1 line adds whitespace errors. Applying: PM: add RHDGetDefaultMemoryClock Applying: PM: get rid of EnableForced field Applying: PM: add memory downclocking. Commented out for now. /home/david/archlinux/apps/radeonhd/.git/rebase-apply/patch:28: trailing whitespace. "calculated memory clock at %ldHz\n", warning: 1 line adds whitespace errors. 23:56 alchemy:~/archlinux/apps/radeonhd> find . -name 'rhd_pm.c' ./src/rhd_pm.c 23:57 alchemy:~/archlinux/apps/radeonhd> vi src/rhd_pm.c #if 1 unsigned long defaultMemory = RHDGetDefaultMemoryClock(rhdPtr); if (defaultMemory) { Pm->ForcedMemoryClock = defaultMemory / 2; xf86DrvMsg(rhdPtr->scrnIndex, X_INFO, "ForceLowPowerMode: " "calculated memory clock at %ldHz\n", Pm->ForcedEngineClock); } <snip> Reboot & check /var/log/Xorg.0.log <snip> (II) RADEONHD: version 1.2.5, built from git branch downclocking, commit 0de8b484 + changes <snip> The current log file is at: http://www.3111skyline.com/download/linux/radeonhd/downclock/Xorg.0.log.2900... I haven't pulled any additional temperatures for comparison because there wouldn't be that much difference, it's still HOT. Looking through the log file, it is quite a coincidence that the downclocking chose 140000 as the memory clock downclock because that was exactly what I had been setting with the: Option "LowPowerModeEngineClock" "140000" At least we know that the patch applies OK and that it has the desired effect on the memory clock. Now if we can just figure out what else we need to power down to get the temps under control, we will be home free! Thank you for your patch. As I said before, I have the perfect box for testing, so let me know when you have the next one ready and I'll be happy to test it. -- 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 www.rankinlawfirm.com