[Intel-gfx] Sandy Bridge Desktop - 1920x1080i interlace not working

Daniel Vetter daniel at ffwll.ch
Wed Jan 18 21:12:34 CET 2012

On Wed, Jan 18, 2012 at 05:08:55PM +0100, Alfonso Fiore wrote:
> On Tue, Jan 17, 2012 at 10:34 PM, Daniel Vetter <daniel at ffwll.ch> wrote:
> >
> > On Tue, Jan 17, 2012 at 09:59:18PM +0100, Alfonso Fiore wrote:
> > > Hi,
> > >
> > > here is mine. Let me know if you need any other log.
> >
> > Ok, your TV only reports 1080i as a mode (at least that's the only thing
> > your kernel can decode). The i915 driver then rejects it because it's
> > interlaced (we unfortunately do not yet support interlaced everywhere we
> > could). Which leaves you with no modes, so as a fallback the kernel just
> > adds a bunch of default VGA modes which your TV can't cope with properly.
> Hi Daniel,
> would you agree that these are two separate bugs?
> I'd like the Intel driver to both:
> - allow me to use 1920x1080i
> - allow me to use 1024x768p without reverting to nomodeset

Yep, that's correct. For the first issue Peter Ross is working on some
patches, for the later I suspect the missing CEA support. Please try this
out by grabbing the kernel tree I've told you and running it. Peter's
patches are on this mailing list, if it's easier for you I could create a
quick git branch somewhere.

> If I want to see a video where a progressive resolution brings better
> results than an interlaced resolution (despite the less pixels) I'd
> like to be able to.
> Right now, with nomodeset I can only play video using VLC which has
> its own hardware acceleration. With the embedded xbmc player I can't
> watch any video.
> Will a proper way to see 1024x768 be added? kernel 3.0.0-12.20 (Ubuntu
> 11.10) was working fine with the i3 550.

Hm, that smells like a regression. Was this also with nomodeset?
Daniel Vetter
Mail: daniel at ffwll.ch
Mobile: +41 (0)79 365 57 48

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