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

[Alfonso Fiore]

>  Ok, your TV only reports 1080i as a mode (at least that's the only
thing your kernel can decode).

true, it's non a Full HD TV.

>  we unfortunately do not yet support interlaced everywhere we could

when do you think the support will be added? weeks? months?

>  can you add a short list of the modelines you've manually added
that work with your TV?

not sure I understand your question... The TV works with nomodeset and then
I tried a bunch of resolutions with xrandr (when running without nomodeset)
that ALL didn't work:

I tried some of the modes I got from Xorg.0.log:
[    88.893] (II) intel(0): Modeline "1920x1080i"x0.0   74.25  1920 2448
2492 2640  1080 1084 1094 1125 interlace +hsync +vsync (28.1 kHz)
[    88.893] (II) intel(0): Modeline "1024x768"x0.0   65.00  1024 1048 1184
1344  768 771 777 806 -hsync -vsync (48.4 kHz)
[    88.893] (II) intel(0): Modeline "1920x1080i"x0.0   74.25  1920 2008
2052 2200  1080 1084 1094 1125 interlace +hsync +vsync (33.8 kHz)
[    88.893] (II) intel(0): Modeline "1280x720"x0.0   74.25  1280 1720 1760
1980  720 725 730 750 +hsync +vsync (37.5 kHz)
[    88.893] (II) intel(0): Modeline "1280x720"x0.0   74.25  1280 1390 1430
1650  720 725 730 750 +hsync +vsync (45.0 kHz)
[    88.893] (II) intel(0): Modeline "720x576"x0.0   27.00  720 732 796 864
 576 581 586 625 -hsync -vsync (31.2 kHz)
[    88.893] (II) intel(0): Modeline "720x480"x0.0   27.00  720 736 798 858
 480 483 489 525 -hsync -vsync (31.5 kHz)
[    88.893] (II) intel(0): Modeline "800x600"x0.0   40.00  800 840 968
1056  600 601 605 628 +hsync +vsync (37.9 kHz)
[    88.893] (II) intel(0): Modeline "640x480"x0.0   25.18  640 656 752 800
 480 490 492 525 -hsync -vsync (31.5 kHz)
[    88.893] (II) intel(0): Modeline "720x480"x0.0   27.00  720 736 798 858
 480 489 495 525 -hsync -vsync (31.5 kHz)
[    88.893] (II) intel(0): Modeline "1440x480i"x0.0   27.00  1440 1478
1602 1716  480 488 494 525 interlace -hsync -vsync (15.7 kHz)
[    88.893] (II) intel(0): Modeline "1440x240"x0.0   27.00  1440 1478 1602
1716  240 244 247 262 -hsync -vsync (15.7 kHz)
[    88.893] (II) intel(0): Modeline "1440x576i"x0.0   27.00  1440 1464
1590 1728  576 580 586 625 interlace -hsync -vsync (15.6 kHz)
[    88.893] (II) intel(0): Modeline "1440x288"x0.0   27.00  1440 1464 1590
1728  288 290 293 312 -hsync -vsync (15.6 kHz)

74.25  1920 2448 2492 2640  1080 1084 1094 1125 interlace +hsync +vsync
nothing - blue screen (and now I know why since it's interlaced)

65.00  1024 1048 1184 1344  768 771 777 806 -hsync -vsync
back to the original situation (two bands, flickering)

74.25  1920 2008 2052 2200  1080 1084 1094 1125 interlace +hsync +vsync
nothing - blue screen

74.25  1280 1720 1760 1980  720 725 730 750 +hsync +vsync
three bands, flickering

74.25  1280 1390 1430 1650  720 725 730 750 +hsync +vsync
two bands, flickering

27.00  720 732 796 864  576 581 586 625 -hsync -vsync
three bands, no flickering

27.00  720 736 798 858  480 483 489 525 -hsync -vsync
two bands, no flickering

40.00  800 840 968 1056  600 601 605 628 +hsync +vsync
two bands, flickering

27.00  1440 1478 1602 1716  480 488 494 525 interlace -hsync -vsync
strange aspect ratio, the screen is zoomed, no flickering

all this on a Ubuntu 11.10 with kernel 3.2.0-7-generic-pae and X.Org X
Server 1.10.4 (xorg-edgers crashes after a few mins for me and doesn't
solve the problem: still split-screen).

cheers,


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.
>
> Your TV likely sends a CEA block with some HDMI default modes set. Since
> linux-3.3-rc1 (to be released in a few days) we should be able to decode
> that. Can you grab the latest -linus kernel git and try that?
>
> Also, can you add a short list of the modelines you've manually added that
> work with your TV?
>
> Yours, Daniel
> --
> Daniel Vetter
> Mail: daniel at ffwll.ch
> Mobile: +41 (0)79 365 57 48
>
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