[mythtv-users] problem getting X to display on TV using EDID

[James Buckley]

Actually, your TV's EDID information is not *required* to generate a
modeline, it is simply used to warn you when the modeline is out of the
range of your TV (which, if you are using a common resolution, is probably
not the case). However, a modeline may not *work*, as in the TV doesn't
accept the vsync, hsync or other whatnot. This is where tweaking is normally
required.

If I understand you correctly, when you try any modelines, your *TV* pops a
message up saying "Not supported mode", right? If that's the case, then you
would not get any warnings or errors in your Xorg log because there __were__
none. The modeline was in the range of your TV's capabilities (As reported
by the EDID, but who trusts that info anyway), and there were no problems
outputting the specified modeline. So as far as your PC is concerned,
everything is working perfectly. Your problem lies with you TV trying to
process the signal (if that's the right word) and display it, it can't. You
need to tweak your modeline until it can, however I don't know how to do
that...

I think XVidtune will only work once you've got a display, so that's no
good. Google doesn't get a single hit with your model number and "modeline",
so my best advice is just to try every modeline you come across. Below are
two I found of Gentoo Wiki's HDTV entry.

ModeLine "My720p"  73.825 1280 1320 1368 1640 720 722 724 751 +hsync +vsync 
ModeLine "My720p2" 73.825 1280 1320 1368 1640 720 722 724 751 +hsync +vsync

Sorry if I made all that a bit confusing, I find it hard to get what's in my
head on the screen.

James

-----Original Message-----
From: mythtv-users-bounces at mythtv.org
[mailto:mythtv-users-bounces at mythtv.org] On Behalf Of Jakob Fix
Sent: 09 June 2006 23:54
To: Discussion about mythtv
Subject: [mythtv-users] problem getting X to display on TV using EDID

Hello,

I spent all night trying to figure out why I can't get X window to
display on my TV.

In a previous message to this list I read that one can use EDID
information that is read from the TV set to create a matching
Modeline.

I tried videogen, the xtiming.pl script and similar tools to generate
Modelines.  Usually, the TV displays "Not supported mode", but the
Xorg log doesn't shows any [EE] or [WW] messages.

Some background: I've bought a Samsung LCD TV (LE32R5) which has a
resolution of 1360x768 at 60Hz according to the manual, and it has HDMI
input.  My Mythbox is an Asus Pundit R350 with a ATI 9100 IGP with DVI
output.  I connected both with a DVI-HDMI cable and am able to see the
console, unfortunately with some horrible overscan, but anyway.  The
machine runs using Debian Sarge and Xorg 6.9.

The EDID output from the Xorg.0.log is (in part)

(II) RADEON(0): EDID data from the display on port 2-----------------------
(II) RADEON(0): Manufacturer: SAM  Model: 180  Serial#: 0
(II) RADEON(0): Year: 2006  Week: 12
(II) RADEON(0): EDID Version: 1.3
(II) RADEON(0): Digital Display Input
(II) RADEON(0): Max H-Image Size [cm]: horiz.: 89  vert.: 50
(II) RADEON(0): Gamma: 2.40
(II) RADEON(0): No DPMS capabilities specified; RGB/Color Display
(II) RADEON(0): First detailed timing is preferred mode
(II) RADEON(0): redX: 0.632 redY: 0.357   greenX: 0.289 greenY: 0.596
(II) RADEON(0): blueX: 0.143 blueY: 0.085   whiteX: 0.280 whiteY: 0.290
(II) RADEON(0): Supported VESA Video Modes:
(II) RADEON(0): 640x480 at 60Hz
(II) RADEON(0): Manufacturer's mask: 0
(II) RADEON(0): Supported additional Video Mode:
(II) RADEON(0): clock: 74.2 MHz   Image Size:  885 x 498 mm
(II) RADEON(0): h_active: 1280  h_sync: 1390  h_sync_end 1430
h_blank_end 1650 h_border: 0
(II) RADEON(0): v_active: 720  v_sync: 725  v_sync_end 730 v_blanking:
750 v_border: 0
(II) RADEON(0): Supported additional Video Mode:
(II) RADEON(0): clock: 74.2 MHz   Image Size:  885 x 498 mm
(II) RADEON(0): h_active: 1280  h_sync: 1720  h_sync_end 1760
h_blank_end 1980 h_border: 0
(II) RADEON(0): v_active: 720  v_sync: 725  v_sync_end 730 v_blanking:
750 v_border: 0
(II) RADEON(0): Ranges: V min: 50  V max: 61 Hz, H min: 15  H max: 46
kHz, PixClock max 80 MHz

[...]

How can I make a Modeline of this information?

-- 
cheers,
Jakob.
_______________________________________________
mythtv-users mailing list
mythtv-users at mythtv.org
http://mythtv.org/cgi-bin/mailman/listinfo/mythtv-users



___________________________________________________________
$0 Web Hosting with up to 200MB web space, 1000 MB Transfer
10 Personalized POP and Web E-mail Accounts, and much more.
Signup at www.doteasy.com