[Intel-gfx] [PATCH] honor VBIOS SSC & TV settings

[Jesse Barnes]

On Monday, June 30, 2008 2:24 am Jin, Gordon wrote:
> Jesse,
>
> I tested your patch on my Thinkpad T61 (GM965) and R52 (915GM, with
> SVideo TV-out). It works as before, i.e.
> https://bugs.freedesktop.org/show_bug.cgi?id=11366 isn't happening on
> T61.

Good, thanks for testing.  I'm glad it doesn't break anything.

> There's no SSC info in Xorg log. Is this expected? How can I know if the
> external reference clock is actually available?

Hm, on my T61 the SSC clock is used:
(II) intel(0): using SSC reference clock of 100 MHz

As long as the LVDS init function finds that the SSC enable bit is set in the 
VBIOS "general features" table, it should get enabled.

> Below is the xrandr output:
>
> [root at x-gm965 ~]# xrandr -q
> Screen 0: minimum 320 x 200, current 1280 x 800, maximum 2000 x 2000
> VGA disconnected (normal left inverted right x axis y axis)
> LVDS connected 1280x800+0+0 (normal left inverted right x axis y axis)
> 331mm x 207mm
>    1280x800       60.3*+   50.0
>    1024x768       60.0
>    800x600        60.3     56.2
>    640x480        59.9
> TMDS-1 disconnected (normal left inverted right x axis y axis)
>
>   [root at x-915gm ~]# xrandr -q
> Screen 0: minimum 320 x 200, current 1024 x 768, maximum 2048 x 2048
> VGA disconnected (normal left inverted right x axis y axis)
> LVDS connected 1024x768+0+0 (normal left inverted right x axis y axis)
> 0mm x 0mm
>    1024x768       60.0*+   85.0     75.0     70.1     60.0
>    832x624        74.6
>    800x600        85.1     72.2     75.0     60.3     56.2
>    640x480        85.0     72.8     75.0     59.9
>    720x400        85.0
>    640x400        85.1
>    640x350        85.1
> TV disconnected (normal left inverted right x axis y axis)

Hm, this shows that the TV is present but disconnected.  So neither SSC nor TV 
out detection are working for you.  Are you sure you're running the patched 
code?  If so, then there may be more than one model of T61 or VBIOS we have 
to worry about here...

Thanks,
Jesse