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

[Alfonso Fiore]

On Wed, Jan 18, 2012 at 9:53 PM, Daniel Vetter <daniel at ffwll.ch> wrote:
> On Wed, Jan 18, 2012 at 09:44:51PM +0100, Alfonso Fiore wrote:
>> On Wed, Jan 18, 2012 at 9:12 PM, Daniel Vetter <daniel at ffwll.ch> wrote:
>> > 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?
>>
>> Hi Daniel,
>>
>> I'm 100% sure that it was without nomodeset since I didn't reinstalled
>> Ubuntu when I changed MB. Everything was exactly the same
>> (except for MB and CPU) and I turned it on and had this problem.
>> More than that, Ubuntu 11.10 installation was fine with i3 550 but it
>> shows the bug with i3 2130.
>>
>> So, if it's the same code, then I think it is a case of regression.
>
> In that case actually, no. With nomodeset your using the vesa driver which
> uses bios calls to change the resolution. You've changed the bios with the
> mb. One of the reasons kms was created is to avoid such issues ;-)

my bad.

sorry,
alfonso

> -Daniel
> --
> Daniel Vetter
> Mail: daniel at ffwll.ch
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