From mboxrd@z Thu Jan 1 00:00:00 1970 From: bugzilla-daemon@freedesktop.org Subject: [Bug 69723] GPU lockups with kernel 3.11.0 / 3.12-rc1 when dpm=1 on r600g (Cayman) Date: Mon, 09 Dec 2013 02:02:14 +0000 Message-ID: References: Mime-Version: 1.0 Content-Type: multipart/mixed; boundary="===============1244031955==" Return-path: Received: from culpepper.freedesktop.org (unknown [131.252.210.165]) by gabe.freedesktop.org (Postfix) with ESMTP id 07F4CFAD10 for ; Sun, 8 Dec 2013 18:02:15 -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 --===============1244031955== Content-Type: multipart/alternative; boundary="1386554534.6Cb00D2.26332"; charset="us-ascii" --1386554534.6Cb00D2.26332 Date: Mon, 9 Dec 2013 02:02:14 +0000 MIME-Version: 1.0 Content-Type: text/plain; charset="UTF-8" https://bugs.freedesktop.org/show_bug.cgi?id=69723 --- Comment #57 from Alexandre Demers --- (In reply to comment #54) > However if I set pi->dynamic_ss to false the lockups disappear, it also > works with dynamic_ss set to true and pi->mclk_ss set to false. > So this seems to point to a spread spectrum mischief. I don't know if dynamic_ss automatically applies to mclk but it seems to, since disabling spread spectrum only for mclk solves your problem. We could suspect that at a given frequency, we have a problem restoring the original message / clock (the higher we get, the harder it is) until at some point it becomes unreliable. I should be able to test it later tonight to confirm if this fixes the bug on my side too. -- You are receiving this mail because: You are the assignee for the bug. --1386554534.6Cb00D2.26332 Date: Mon, 9 Dec 2013 02:02:14 +0000 MIME-Version: 1.0 Content-Type: text/html; charset="UTF-8"

Comment # 57 on bug 69723 from 
(In reply to comment #54)
> However if I set pi->dynamic_ss to false the lockups disappear, it also
> works with dynamic_ss set to true and pi->mclk_ss set to false.
>
So this seems to point to a spread spectrum mischief. I don't know if
dynamic_ss automatically applies to mclk but it seems to, since disabling
spread spectrum only for mclk solves your problem. We could suspect that at a
given frequency, we have a problem restoring the original message / clock (the
higher we get, the harder it is) until at some point it becomes unreliable.

I should be able to test it later tonight to confirm if this fixes the bug on
my side too.

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