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

[Alfonso Fiore]

Hi Angela,

did you try with the latest patches from Peter?

Peter: any idea for a next step since Angela still experienced the bug?

Thank you,
alfonso

On Sat, Jan 21, 2012 at 11:25 AM, Angela Schmid
<angela.schmid at wolke7.net> wrote:
> 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