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

[Alfonso Fiore]

On Thu, Jan 19, 2012 at 4:37 PM, Daniel Vetter <daniel at ffwll.ch> wrote:
>
> Yeah, unfortunately Peter's interlaced patches have issues still on
> Sandybridge. Meanwhile you could try out all the modes the kernel detected
> from the edid with xrandr (also see whether picking a different refresh
> rate with --rate changes anything). If any of them work correctly (instead
> of the cut-in-half or tiny screen), that might be interesting to know.

Hi,

more tests with the drm-intel-fixes and no "nomoreset".

I boot (as usual) just with HDMI cable.

The PC boots in that weird way (I sent photos today) and then when I
login the screen is split.

Interestingly, trying to connect the same screen over VGA (while
running and already connected over HDMI) makes X hang BUT it also
changes the way X shows: full screen, no flicker (i.e. as it should).

when I restart X (sudo restart lightdm) I have a FANTASTIC PERFECT SCREEN! :) :)

$ xrandr -q
Screen 0: minimum 320 x 200, current 1024 x 768, maximum 8192 x 8192
VGA1 connected 1024x768+0+0 (normal left inverted right x axis y axis)
400mm x 300mm
   1024x768       60.0*
   800x600        60.3     56.2
   848x480        60.0
   640x480        59.9
HDMI1 disconnected (normal left inverted right x axis y axis)
DP1 disconnected (normal left inverted right x axis y axis)
HDMI2 connected 1024x768+0+0 (normal left inverted right x axis y
axis) 640mm x 360mm
   1280x720       50.0     60.0
   1024x768       60.0*
   800x600        60.3
   720x576        50.0
   720x480        59.9     59.9
   640x480        60.0     59.9
HDMI3 disconnected (normal left inverted right x axis y axis)
DP2 disconnected (normal left inverted right x axis y axis)
DP3 disconnected (normal left inverted right x axis y axis)

2nd test: I reboot again just with HDMI connected.
LightDM still looking "weird" (like today's picture) and after login
still split screen.
When I plug the VGA cable (over DVI-I) the screen goes black (not blue).
If I restart X the screen goes blue and then black and from VNC I can
see it's still 1024x768 (so why black?).

xrandr -q didn't change.

if I turn the TV over the VGA signal I get a very weird full green
image flickering very fast.

3rd test: I reboot again with both cables connected (VGA over DVI-I and HDMI).

LightDM and X looks PERFECT! :) Both login screen and session looks
just like they should.

4rd test: same as previous but I want to check if it will happen the same way.

Yes, again, LightDM and X looks PERFECT! Interestingly, if on the TV I
switch to VGA input I see a black screen...

I attach the logs for this session, maybe you can figure out how to
have this behavior without VGA cable plugged in!

about testing different resolutions. If I test them from THIS
situation (e.g. both cables connected from boot) I report the
following:

xrandr --output HDMI2 --mode 1280x720 ===> I get quite a bit overscan
but the picture is stable
xrandr --output HDMI2 --mode 1024x768 ===> fits like a glove. Not a
pixel of overscan. Never had such a good fit over VGA with my laptop
and XP.
xrandr --output HDMI2 --mode 800x600 ===> this is quite hard to
explain. The "real" screen is 1024x768 but I can only see 800x600 but
X seems to know what's going on because it creates two sets of
controls, one aligned at 800, one aligned at 1024.
I guess the two screenshots will help you (one of the TV screen and
then a screen grab).

> Maybe also attach the raw edid, you can find it in /sys/class/drm/*/edid
> for your TV.

about my edid info:

$ find /sys/ | grep edid
/sys/devices/pci0000:00/0000:00:02.0/drm/card0/card0-VGA-1/edid
/sys/devices/pci0000:00/0000:00:02.0/drm/card0/card0-HDMI-A-1/edid
/sys/devices/pci0000:00/0000:00:02.0/drm/card0/card0-DP-1/edid
/sys/devices/pci0000:00/0000:00:02.0/drm/card0/card0-HDMI-A-2/edid
/sys/devices/pci0000:00/0000:00:02.0/drm/card0/card0-HDMI-A-3/edid
/sys/devices/pci0000:00/0000:00:02.0/drm/card0/card0-DP-2/edid
/sys/devices/pci0000:00/0000:00:02.0/drm/card0/card0-DP-3/edid

Interestingly enough the EDID I get from VGA is 256 bytes while EDID
from HDMI is 128 bytes...

They are both in the logs.

hope this helps you help me,
alfonso
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