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

[Peter Ross]

On Thu, Jan 19, 2012 at 10:09:04AM +0100, Alfonso Fiore wrote:
> Ok,
> 
> results from git/torvalds/linux.git plus Peter's patch.
> 
> The system boots in 1024x768 with the flickering problem.

Did you have this problem before you booted with the patched
kernel?

> Then I manually try to switch to interlaced. I saw from Xorg.0.log
> (attached) the following two modelines so I tried both:
> 
> #Modeline 1920x1080ix0.0 74.25 1920 2448 2492 2640 1080 1084 1094 1125
> interlace +hsync +vsync (28.1 kHz)
> #Modeline 1920x1080ix0.0 74.25 1920 2008 2052 2200 1080 1084 1094 1125
> interlace +hsync +vsync (33.8 kHz)
> 
> xrandr --newmode "1920x1080i_01" 74.25 1920 2448 2492 2640 1080 1084
> 1094 1125 interlace +hsync +vsync
> xrandr --addmode HDMI2 "1920x1080i_01"
> xrandr --output HDMI2 --mode "1920x1080i_01"
> 
> xrandr --newmode "1920x1080i_02" 74.25 1920 2008 2052 2200 1080 1084
> 1094 1125 interlace +hsync +vsync
> xrandr --addmode HDMI2 "1920x1080i_02"
> xrandr --output HDMI2 --mode "1920x1080i_02"
> 
> in both cases the resolution change takes effect (I can see that cause
> I use VNC) but the screen goes blue.

First things first. The new kernel will automatically detect the modes
supported by your TV. So before changing modes run "xrandr -q" to get
a list of supported modes. It should list something like 1920x1080 @ 25 Hz
or 30 Hz.

Then use xrandr to switch modes. e.g.
xrandr --output HDMI2 --mode 1920x1080 --rate 30

> I also attached output dmesg with drm.debug=0xe

The file didnt come through.

-- Peter
(A907 E02F A6E5 0CD2 34CD 20D2 6760 79C5 AC40 DD6B)
-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 198 bytes
Desc: Digital signature
URL: <http://lists.freedesktop.org/archives/intel-gfx/attachments/20120119/3b3adeb6/attachment.sig>