Re: [bisected] i915 regression in post 2.6.36 kernels

Johannes Hirte
2010-11-12T20:07:04Z

On Friday 12 November 2010 19:20:46 Florian Mickler wrote:
> On Wed, 10 Nov 2010 23:39:35 +0100
> Johannes Hirte <johannes.hirte@fem.tu-ilmenau.de> wrote:
>
> > On Wednesday 10 November 2010 08:46:40 Chris Wilson wrote:
> > > On Wed, 10 Nov 2010 08:02:19 +0100, Johannes Hirte <johannes.hirte@fem.tu-ilmenau.de> wrote:
> > > > With the latest kernel, I don't get any windows in KDE displayed. After
> > > > starting kdm, I get the background picture and the mouse cursor but not the
> > > > login window. I can login blindly and a ps on console shows me that the
> > > > expected KDE processes are started but still nothing is displayed.
> > > > I've bisected this to:
> > > >
> > > > 5c12a07e8073295ce8b57a822f811ac34e4f8420 is the first bad commit
> > > > commit 5c12a07e8073295ce8b57a822f811ac34e4f8420
> > > > Author: Chris Wilson <chris@chris-wilson.co.uk>
> > > > Date: Wed Sep 22 11:22:30 2010 +0100
> > > >
> > > > drm/i915: Drop ring->lazy_request
> > > >
> > > > We are not currently using it as intended, so remove the complication.
> > > >
> > > > Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
> > >
> > > May I ask you to recheck your bisection, since that was later reverted.
> > > -Chris
> >
> > Did so. I've started with v2.6.36 for bisect good and
> > f6614b7bb405a9b35dd28baea989a749492c46b2 for bisect bad (was HEAD) in this
> > case. Again I ended in 5c12a07e8073295ce8b57a822f811ac34e4f8420 as the first
> > bad commit. The regression was introduced there, as the commit before is fine.
> > If it was reverted, the regression should be fixed by this. But I don't find
> > neither the fix/revert nor the reintroduction of the regression.
> >
> > regrards,
> > Johannes
>
> The revert is a56ba56c275b1c2b982c8901ab92bf5a0fd0b757 .

Thanks for the hint. This was the commit I was searching for. Unfortunately
this version shows the same regression. I've checked again, that
5c12a07e8073295ce8b57a822f811ac34e4f8420 is the first bad version.
2.6.36-rc5-00228-g2896b53 (2896b5397570f6857fd5d0e0533f640b05b1d162) works
2.6.36-rc5-00229-g5c12a07 (5c12a07e8073295ce8b57a822f811ac34e4f8420) doesn't.
Someone with knowledge of the code should have a look what's different
between 5c12a07e8073295ce8b57a822f811ac34e4f8420 and its revert.

regards,
Johannes