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

[Angela Schmid]

Hello
I tested with the patches applied. Xrandr shows the available interlaced modes automatically.
xrandr --output VGA1 --off
xrandr --output HDMI3 --mode 1920x1080 --rate 25
The television flickers. The lower part of the desktop is visible (lower menu with wastebin) in the upper left quadrant.

I start with VGA1 connected too, so that grub is shown in 1024x768 mode. During boot both flicker, which they didn't before. Both
show a desktop in 1024x768 correct. Changing HDMI3 to 1920x1080, the VGA1 stays in the 1024x768 mode, both flicker.
With the noveau driver (GTX275) I hadn't any side-effects.

I personally don't need a VGA1 connection, so I disconnected it for my test, see attached logs. 
If screenshots are welcome, please tell me how.

Yi already mentioned that SandyBridge still has a problem, which I can confirm for my GT2+. Any patches for testing are welcome.

Angela

Settings used:
wget http://paste.debian.net/download/152705
wget http://paste.debian.net/download/152707
wget http://paste.debian.net/download/152708

$ git am 152705 152707 152708
Applying: drm/i915: specify vertical timings in frame units for interlaced modes (gen3+)
Applying: drm/i915: allow interlaced mode output on the SDVO connector
Applying: drm/i915: allow interlaced mode output on the HDMI connector



> -----Original Message-----
> From: Angela Schmid [mailto:angela.schmid at wolke7.net]
> Sent: 20 January 2012 19:07
> To: 'Alfonso Fiore'; 'Peter Ross'
> Cc: 'Daniel Vetter'; 'Rodrigo Vivi'
> Subject: RE: [Intel-gfx] Sandy Bridge Desktop - 1920x1080i interlace not working
> 
> Hello
> 
> From my first mail:
> I have a Philips 37pf9830 television (at 1920x1080 only interlace possible) over Sandy Bridge HDMI. Changing to
> 1920x1080i is not working.
> Nvidia noveau with GTX275 (using yellow DVI->HDMI Adapter) , grub2 (vesa?), Windows 7 over HDMI and a Windows 7
> laptop with AMD graphics with HDMI all work fine.
> I tried several other modelines, which work for the noveau driver, but not for the intel driver.
> The highest resolution possible is "1280x720 at 50hz"   74.25  1280 1720 1760 1980  720 725 730 750 +hsync +vsync
> 
> When using only HDMI grub2 will start in 1080i but xorg is not visible afterwards.
> For booting I have to add a DVI display to start grub2 in a lower resolution. Either disconnect as soon as
> possible or I use xrandr -output VGA1 -off
> 
> Addition:
> I hadn't time to test the fixes. I will have a look next week.
> 
> Angela
> 
> > -----Original Message-----
> > From: Alfonso Fiore [mailto:alfonso.fiore at gmail.com]
> > Sent: 20 January 2012 13:53
> > To: Peter Ross
> > Cc: Daniel Vetter; Rodrigo Vivi; Angela Schmid
> > Subject: Re: [Intel-gfx] Sandy Bridge Desktop - 1920x1080i interlace not working
> >
> > Angela,
> >
> > please have a look and comment below.
> >
> > thanks,
> > alfonso
> >
> > On Fri, Jan 20, 2012 at 1:40 PM, Peter Ross <pross at xvid.org> wrote:
> > >
> > > What concerns me is that some other folk have reported working
> > > interlaced output on the Sandy Bridge chipset. So I'm left thinking
> > > your TV device may be very fussy about the signal timings, hence
> > > why you get a blue 'no signal' screen.
> > >
> > > PATCH-v2 has a problem, where the vertical timings are off by
> > > two lines (giving 1920x1078i, instead of 1080i). Your TV may
> > > reject this mode,
> > >
> > > The enclosed patch corrects this problem. It should be applied on-top
> > > of the PATCHv2 set. Rebuild your kernel and try changing to an
> > > interlaced mode using xrandr.
> > >
> > > Otherwise, we have kind of exhausted all the readily available options
> > > here. The next step would be to reverse engineer the Intel windows
> > > driver, since you reported it to output 1080i to your TV.
> >
> > Peter, my apologies if I mislead you.
> >
> > I've never seen any 1080i resolution on my TV. Maybe Angela did?
> >
> > I only saw a working 1024x768 resolution (which is now achieved
> > constantly with the hack of connecting both VGA and HDMI cable to the
> > same TV).
> >
> > Can you please tell me which commands to apply the patch of the patch?
> >
> > thank you,
> > alfonso
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