linux-kernel - Re: 3.15.0-rc2 radeon HD 7480D [Aruba] blank display

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Date:	Tue, 22 Apr 2014 11:34:14 -0400
From:	Ed Tomlinson <edt@....ca>
To:	Alex Deucher <alexdeucher@...il.com>
Cc:	Ken Moffat <zarniwhoop@...world.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: 3.15.0-rc2 radeon HD 7480D [Aruba] blank display

On Tuesday 22 April 2014 01:54:01 Alex Deucher wrote:
> On Mon, Apr 21, 2014 at 10:34 PM, Ken Moffat <zarniwhoop@...world.com> wrote:
> > On Tue, Apr 22, 2014 at 03:31:06AM +0100, Ken Moffat wrote:
> >
> > [ resending, somehow lkml dropped out of the Cc. ]
> >
> >> On Tue, Apr 22, 2014 at 12:19:40AM +0100, Ken Moffat wrote:
> >> > On Mon, Apr 21, 2014 at 05:29:27PM -0400, Ed Tomlinson wrote:
> >>
> >> > > Ken,
> >> > >
> >> > > You might want to try reverting:
> >> > >
> >> > > commit 379dfc25e257ffe10eb53b86d2375f7c0f4f33ef
> >> > > Author: Alex Deucher <alexdeucher@...il.com>
> >> > > Date:   Mon Apr 7 10:33:46 2014 -0400
> >> > >
> >> > >     drm/radeon/dp: switch to the common i2c over aux code
> >> > >
> >> > >     Provides a nice cleanup in radeon.
> >> > >
> >> > >     Signed-off-by: Alex Deucher <alexander.deucher@....com>
> >> > >     Signed-off-by: Christian König <christian.koenig@....com>
> >> > >
> >> > > This fixed a similar problem here (see the drm pull thread for rc1)
> >> > >
> >> > > Thanks
> >> > > Ed Tomlinson
> >> >
> >> >  Tried reverting that from rc2, but it didn't help.  Thanks anyway.
> >> >
> >>
> >>  Well, I *believed* I had created a patch for that commit, and
> >> reverted it from -rc2 with patch -R.  But I've now bisected through
> >> drivers/gpu/drm between v3.14.0 and v3.15-rc2 and the bisection
> >> pointed to that same commit, so I guess I did something wrong.
> >>
> >>  There were a couple of other issues along the way (mounting nfs
> >> hung on one commit, startx hung on several of the commits, but I've
> >> marked those as "good" because I had a display, even if the system
> >> was not usable).
> >>
> >>  I've now gone back to linus' tree that I cloned a few hours ago,
> >> i.e.
> >> commit c089b229dfdd09d59a11d8bc2344bf8196d575ce
> >> Merge: 9ac03675010a 0565103d1adb
> >> Author: Linus Torvalds <torvalds@...ux-foundation.org>
> >> Date:   Mon Apr 21 10:05:35 2014 -0700
> >>
> >>     Merge branch 'for-linus' of
> >> git://git.kernel.org/pub/scm/linux/kernel/git/rw/uml
> >>
> >> created a branch, and *definitely* reverted
> >> 379dfc25e257ffe10eb53b86d2375f7c0f4f33ef (using git revert) in that
> >> branch.  And this version works fine.
> >>
> >>  So belatedly I see that I seem to have the same problem as Ed.  Or
> >> at least that the same commit is causing both our problems.
> >>
> >>  Alex - do you need any more information from me to help with this ?
> 
> The attached patch should fix it.

And it does here (on bonaire, r7 260x).  You can add my tested by

Tested-by: Ed Tomlinson <edtoml@...il.com>

Thanks,
Ed Tomlinson
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