From mboxrd@z Thu Jan 1 00:00:00 1970 From: Andy Furniss Subject: Re: [PATCH] drm/radeon: disable dpm on rv770 by default Date: Sat, 19 Apr 2014 19:02:46 +0100 Message-ID: <5352BA46.6060503@gmail.com> References: <1397826491-18837-1-git-send-email-alexander.deucher@amd.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii"; Format="flowed" Content-Transfer-Encoding: 7bit Return-path: Received: from mail-we0-f174.google.com (mail-we0-f174.google.com [74.125.82.174]) by gabe.freedesktop.org (Postfix) with ESMTP id 8692F6E0CE for ; Sat, 19 Apr 2014 11:02:48 -0700 (PDT) Received: by mail-we0-f174.google.com with SMTP id t60so2506504wes.19 for ; Sat, 19 Apr 2014 11:02:47 -0700 (PDT) In-Reply-To: <1397826491-18837-1-git-send-email-alexander.deucher@amd.com> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" To: Alex Deucher , dri-devel@lists.freedesktop.org, deathsimple@vodafone.de Cc: Alex Deucher , matthias.graf@st.ovqu.de, bp@alien8.de, stable@vger.kernel.org List-Id: dri-devel@lists.freedesktop.org Alex Deucher wrote: > There seem to be stability issues on a number of cards. > > bugs: https://bugs.freedesktop.org/show_bug.cgi?id=76286 > https://bugzilla.redhat.com/show_bug.cgi?id=1085785 > https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=741619 Well TBH I don't know whether the following is useful info or not - it could just be an unrelated waste of your time. I have run my 4890 with dpm=1 from when it first appeared without issue till recently. As in the bug above I can't now use two screens - but the thing is, I use a (getting old) LFS, I don't use the TV that much, but when I noticed the issue I tried to bisect and I reached the commit after my working start point. It turned out that my working was the last kernel I compiled with GCC 4.6.3. I had upgraded to GCC 4.8.2 and no kernel built with that can handle 2 screens without locking, no sysrq, no network but very rarely may unlock for a short while (did a dmesg when this happened, nothing unusual logged then it locked again). I built my GCC 4.6.3 again and built the same recent kernel (I run drm next or fixes) and I have so far not been able to lock it with 2 screens. Of course it could just be something on my LFS is too old for recent GCC, or because I don't use TV much I am being lucky with 4.6.3. I will when I get time build 4.8.2 again and see if dpm=0 works for me.