From: "Rafael J. Wysocki" <rjw@sisk.pl>
To: Alex Deucher <alexdeucher@gmail.com>
Subject: Re: [Regression, post-rc1] Multiple issues after enabling SetVoltage on rs780m
Date: Mon, 7 Jun 2010 23:37:17 +0200
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Cc: Dave Airlie <airlied@gmail.com>, Dave Airlie <airlied@redhat.com>,
       LKML <linux-kernel@vger.kernel.org>,
       Linus Torvalds <torvalds@linux-foundation.org>,
       Andrew Morton <akpm@linux-foundation.org>,
       dri-devel@lists.sourceforge.net
References: <201006071129.32159.rjw@sisk.pl> <AANLkTinx-5-jjtnYnUAsl-DvFtbL6wtyPnALdri0d-d2@mail.gmail.com> <AANLkTilerIhYtHlX0vNAg_pfG_1100OymKV4aaGv-VSE@mail.gmail.com>
In-Reply-To: <AANLkTilerIhYtHlX0vNAg_pfG_1100OymKV4aaGv-VSE@mail.gmail.com>
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On Monday 07 June 2010, Alex Deucher wrote:
> On Mon, Jun 7, 2010 at 6:15 AM, Dave Airlie <airlied@gmail.com> wrote:
> > On Mon, Jun 7, 2010 at 7:29 PM, Rafael J. Wysocki <rjw@sisk.pl> wrote:
> >> Hi Alex,
> >>
> >> Your commit 9349d5cc920c10845693f906ebd67f394f1d0d04
> >> (drm/radeon/kms/pm: enable SetVoltage on r7xx/evergreen) has caused my test-bed
> >> Acer Ferrari One to behave quite unreliably.  The symptoms are:
> >>
> >> - the system hangs hard (~ 50% of the time) when starting Xorg
> >> - the system hangs hard (~ 50% of the time) when stopping Xorg during system
> >>  reboot
> >> - the system sometimes hangs hard during suspend to RAM
> >>
> >> These problems are not reproducible with the commit above reverted.
> >>
> >> Below is the information about the graphics adapter from lspci.
> >
> > Reverting that commit on master fixes it?
> >
> > that commit touches code paths in rv770 and evergreen that in no way
> > should affect that chipset which is an rs780, so takes the r600 paths.
> >
> > are you sure its not 7ac9aa5a1f1b87adb69bcbec2b89e228f074103a?
> 
> It should be that commit if it is indeed the voltage adjust.  That
> said, I just took a closer look at the voltage adjust on newer IGPs
> and unfortunately, it doesn't work the same as the discrete cards, so
> for now we should disable it.  The attached patch should do the trick.
>  There weren't any problems on my IGP chips, but they don't have a
> SetVoltage table, so nothing is touching the hw.

I'm not sure if the adapter is a discrete one.

Anyway, my testing was done before commit
386f40c86d6c8d5b717ef20620af1a750d0dacb4 and I'm unable to reproduce the
problems with current -git, so they might be a fallout of the bug fixed by that
commit.

Thanks,
Rafael
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