From mboxrd@z Thu Jan 1 00:00:00 1970 From: bugzilla-daemon@freedesktop.org Subject: [Bug 90263] GPU card fans run full speed at all times Date: Wed, 20 May 2015 13:50:29 +0000 Message-ID: References: Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="===============0334085105==" Return-path: Received: from culpepper.freedesktop.org (unknown [131.252.210.165]) by gabe.freedesktop.org (Postfix) with ESMTP id 77FC46E776 for ; Wed, 20 May 2015 06:50:29 -0700 (PDT) In-Reply-To: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" To: dri-devel@lists.freedesktop.org List-Id: dri-devel@lists.freedesktop.org --===============0334085105== Content-Type: multipart/alternative; boundary="1432129829.Bca0567C2.1729"; charset="UTF-8" --1432129829.Bca0567C2.1729 Date: Wed, 20 May 2015 13:50:29 +0000 MIME-Version: 1.0 Content-Type: text/plain; charset="UTF-8" https://bugs.freedesktop.org/show_bug.cgi?id=90263 --- Comment #12 from Alex Deucher --- (In reply to Todd from comment #11) > I was expecting this problem to be solved through the miracle of "dynamic > power management support" brought down from the mountain of Linux 4. > > I had assumed that the GPU was running at full power all the time under the > Linux Radeon driver, hence the loud fans. When booted to Windows 7, the card > is quiet. > > Is fan speed control a different issue? I'm losing track of what this issue > is a symptom of and where to correctly report the bug. Power management support has been available and enabled by default for your card for a while now (since 3.12 or so IIRC). The driver properly controls the clocks and voltages on your card. The fan control is somewhat independent. For most cards of this generation, the vbios sets up the fan profile to scale the fan based on GPU temperature and the driver just uses that. You happen to have a card with a limited vbios fan profile that requires the driver to set up smc fan control. -- You are receiving this mail because: You are the assignee for the bug. --1432129829.Bca0567C2.1729 Date: Wed, 20 May 2015 13:50:29 +0000 MIME-Version: 1.0 Content-Type: text/html; charset="UTF-8"

Comment # 12 on bug 90263 from 
(In reply to Todd from comment #11)
> I was expecting this problem to be solved through the miracle of "dynamic
> power management support" brought down from the mountain of Linux 4.
> 
> I had assumed that the GPU was running at full power all the time under the
> Linux Radeon driver, hence the loud fans. When booted to Windows 7, the card
> is quiet.
> 
> Is fan speed control a different issue? I'm losing track of what this issue
> is a symptom of and where to correctly report the bug.

Power management support has been available and enabled by default for your
card for a while now (since 3.12 or so IIRC).  The driver properly controls the
clocks and voltages on your card.  The fan control is somewhat independent. 
For most cards of this generation, the vbios sets up the fan profile to scale
the fan based on GPU temperature and the driver just uses that.  You happen to
have a card with a limited vbios fan profile that requires the driver to set up
smc fan control.

You are receiving this mail because:
  • You are the assignee for the bug.
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