From mboxrd@z Thu Jan 1 00:00:00 1970 From: Harald Judt Subject: [r600g] ATI Radeon HD6950, dual monitor and power profile Date: Tue, 20 Dec 2011 19:38:08 +0100 Message-ID: <4EF0D610.6020604@gmx.at> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii"; Format="flowed" Content-Transfer-Encoding: 7bit Return-path: Received: from mailout-de.gmx.net (mailout-de.gmx.net [213.165.64.23]) by gabe.freedesktop.org (Postfix) with SMTP id 6D6BAA08E2 for ; Tue, 20 Dec 2011 10:38:12 -0800 (PST) List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: dri-devel-bounces+sf-dri-devel=m.gmane.org@lists.freedesktop.org Errors-To: dri-devel-bounces+sf-dri-devel=m.gmane.org@lists.freedesktop.org To: dri-devel@lists.freedesktop.org List-Id: dri-devel@lists.freedesktop.org Hi, When using more than one monitor, the card uses higher clocks than in single-monitor mode and low-power profile. As a subjectively negative side-effect, the fan on the card starts making more noise. Other cards I used before had no problem with staying quiet even when more monitors were attached. As soon as I switch back to single-monitor mode, clocks go down and the card becomes silent again. Is there a way to manually force lower clock speeds, and therefore reach an acceptable noise level? Maybe make it use the same power profile settings in dual-monitor as in single-monitor? Dual-monitor mode: ~ $ cat /sys/class/drm/card0/device/power_profile low ~ $ cat /sys/kernel/debug/dri/0/radeon_pm_info default engine clock: 800000 kHz current engine clock: 799940 kHz default memory clock: 1250000 kHz current memory clock: 1250000 kHz voltage: 1060 mV Single-monitor mode: ~ $ cat /sys/class/drm/card0/device/power_profile low ~ $ cat /sys/kernel/debug/dri/0/radeon_pm_info default engine clock: 800000 kHz current engine clock: 249990 kHz default memory clock: 1250000 kHz current memory clock: 150000 kHz voltage: 900 mV Regards, Harald -- `Experience is the best teacher.'