From mboxrd@z Thu Jan 1 00:00:00 1970 From: bugzilla-daemon@freedesktop.org Subject: [Bug 69723] Computer freezes with kernel 3.11.0 / 3.12-rc1 (with bug 68235's patches applied) when dpm=1 on r600g (Cayman) Date: Fri, 08 Nov 2013 01:31:29 +0000 Message-ID: References: Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="===============1392695391==" Return-path: Received: from culpepper.freedesktop.org (unknown [131.252.210.165]) by gabe.freedesktop.org (Postfix) with ESMTP id B6C7B113186 for ; Thu, 7 Nov 2013 17:31:29 -0800 (PST) In-Reply-To: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: dri-devel-bounces@lists.freedesktop.org Errors-To: dri-devel-bounces@lists.freedesktop.org To: dri-devel@lists.freedesktop.org List-Id: dri-devel@lists.freedesktop.org --===============1392695391== Content-Type: multipart/alternative; boundary="1383874289.6D15c2.13946"; charset="us-ascii" --1383874289.6D15c2.13946 Date: Fri, 8 Nov 2013 01:31:29 +0000 MIME-Version: 1.0 Content-Type: text/plain; charset="UTF-8" https://bugs.freedesktop.org/show_bug.cgi?id=69723 --- Comment #24 from Alex Deucher --- (In reply to comment #23) > Well, maybe the first thing would be to identify when or what sequence leads > to the hang. That's why I was suggesting to trace it. But if I understand > you correctly, you are saying the GPU is programmed once and then we just > move from state to another, right? > > I'm not sure, but I think I've read somewhere it was possible to set a power > state manually, to force dpm to a given state in other words. Am I right? A power state consists of several performance levels (generally 3 on cayman; low, medium, and high). The driver loads a power state and then the GPU dynamically changes between the performance levels within that state based on GPU load. You can force the GPU to always stay in the low or high state via sysfs. See: http://www.botchco.com/agd5f/?p=57 for more info. That basically tells the GPU to stay in that performance level and to not dynamically transition between performance levels. -- You are receiving this mail because: You are the assignee for the bug. --1383874289.6D15c2.13946 Date: Fri, 8 Nov 2013 01:31:29 +0000 MIME-Version: 1.0 Content-Type: text/html; charset="UTF-8"

Comment # 24 on bug 69723 from 
(In reply to comment #23)
> Well, maybe the first thing would be to identify when or what sequence leads
> to the hang. That's why I was suggesting to trace it. But if I understand
> you correctly, you are saying the GPU is programmed once and then we just
> move from state to another, right?
> 
> I'm not sure, but I think I've read somewhere it was possible to set a power
> state manually, to force dpm to a given state in other words. Am I right?

A power state consists of several performance levels (generally 3 on cayman;
low, medium, and high).  The driver loads a power state and then the GPU
dynamically changes between the performance levels within that state based on
GPU load.  You can force the GPU to always stay in the low or high state via
sysfs.  See:
http://www.botchco.com/agd5f/?p=57
for more info.  That basically tells the GPU to stay in that performance level
and to not dynamically transition between performance levels.

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