linux-kernel - Re: [Regression, post-rc1] Multiple issues after enabling SetVoltage on rs780m

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Date:	Mon, 7 Jun 2010 23:37:17 +0200
From:	"Rafael J. Wysocki" <rjw@...k.pl>
To:	Alex Deucher <alexdeucher@...il.com>
Cc:	Dave Airlie <airlied@...il.com>, Dave Airlie <airlied@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	dri-devel@...ts.sourceforge.net
Subject: Re: [Regression, post-rc1] Multiple issues after enabling SetVoltage on rs780m

On Monday 07 June 2010, Alex Deucher wrote:
> On Mon, Jun 7, 2010 at 6:15 AM, Dave Airlie <airlied@...il.com> wrote:
> > On Mon, Jun 7, 2010 at 7:29 PM, Rafael J. Wysocki <rjw@...k.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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