KMS/radeon regression: failure to set modes on CEDAR & TAHITI; v3.11 vs 3.12-rc5/rc7

[Jerome Glisse]

On Thu, Nov 7, 2013 at 11:52 AM, Alex Deucher <alexdeucher at gmail.com> wrote:

> On Wed, Nov 6, 2013 at 7:12 PM, Robin H. Johnson <robbat2 at gentoo.org>
> wrote:
> > On Wed, Nov 06, 2013 at 05:37:11PM -0500, Jerome Glisse wrote:
> >> On Wed, Nov 06, 2013 at 05:48:55PM +0000, Robin H. Johnson wrote:
> >> > On Wed, Nov 06, 2013 at 12:16:31PM -0500, Alex Deucher wrote:
> >> > > On Wed, Nov 6, 2013 at 12:14 PM, Robin H. Johnson <
> robbat2 at gentoo.org> wrote:
> >> > > > (Resending to dri-devel because the first one didn't make it).
> >> > > >
> >> > > > I apologize for not sending this sooner, but I wanted to be
> really sure that I
> >> > > > wasn't introducing the bug elsewhere, and I was lacking time to
> even narrow it
> >> > > > down this far.
> >> > > >
> >> > > > TL;DR:
> >> > > > 3.11 kernel does proper modeset for dual 1920x1200 outputs
> >> > > > 3.12-rc5/rc7 kernel fails to do proper modeset, blank screen
> after radeon loaded
> >> > > Can you bisect?
> >> > I have the next step in the bisect prepared (taking an educated guess
> >> > and deciding that rc1 was probably also bad, because the changes after
> >> > rc1 were minimal), but this is my primary box for getting work done;
> so
> >> > I haven't rebooted since writing my email and preparing that next
> >> > kernel.
> >> Culprit likely d1e3b5564834ea24dee6b364a172365f64865fe5 try reverting
> that one.
> > Confirmed as the buggy commit via bisect.
> > Then reverted in 3.12 and 3.12 suddenly works.
>
> I'm not sure how you would even be hitting those code paths as hw i2c
> is disabled by default and I don't see it enabled on your kernel
> command line.
>
> Alex
>

Yep, that was puzzling me too but sometimes the universe just get thing
wrongs.

Cheers,
Jerome


>
> >
> > --
> > Robin Hugh Johnson
> > Gentoo Linux: Developer, Trustee & Infrastructure Lead
> > E-Mail     : robbat2 at gentoo.org
> > GnuPG FP   : 11ACBA4F 4778E3F6 E4EDF38E B27B944E 34884E85
>
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