xf86-video-intel accepts modelines for VGA/DVI output but not TV

[Hamish Moffatt]

I've got a couple of modelines which I would like to try for TV
(component/HDTV) output. 

Modeline "1280x720x25" 83.700 1280 1780 1828 2176 720 751 754 769 +hsync +vsync
ModeLine "1920x1080" 74.250 1920 2008 2052 2200 1080 1084 1094 1124 interlace +hsync +vsync

They are accepted for VGA or DVI output, but for TV out the log shows

(II) intel(0): Not using mode "1920x1080" (bad mode clock/interlace/doublescan)
(II) intel(0): Not using mode "1280x720x25" (bad mode clock/interlace/doublescan)


Compared to the built-in 1280x720 mode the dotclock is a lot higher;

(II) intel(0): Modeline "1280x720"x25.0   25.90  1280 1281 1344 1376 720 721 752 753 (18.8 kHz)

Halving the dot clock on my mode makes it acceptable, but for both the
built-in mode and mine the picture is 80% invisible off the left of the
screen. The built-in 1024x768 is nicely centered though.

(II) intel(0): Modeline "1024x768"x25.0   22.43  1024 1025 1088 1120 768 769 800 801 (20.0 kHz)

Any ideas?

thanks
Hamish
-- 
Hamish Moffatt VK3SB <hamish at debian.org> <hamish at cloud.net.au>