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PostPosted: Tue Apr 17, 2007 11:01 pm 
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Joined: Fri Dec 22, 2006 3:00 pm
Posts: 158
I am having a hard time figuring out a suitable modeline for my Panasonic TH-42PX50 plasma screen. I have searched this forum and also googled for an existing modeline for this screen but cannot find anything.

I know there are tons of posts on this forum about modelines but I have read up on them and cannot find anything which helps me with this problem.

I have done my homework and determined that there are the following modeline generators available ..

XFree86 Modeline Generator (at Sourceforge)

videogen

Powerstrip (but requires install on windows platform)

Another Modeline Generator (at http://amlc.berlios.de/)


I haven’t been able to find out all the specs I would like for my screen, the following is from the user manual:

Video input, NTSC
Horizontal frequency = 15.73Khz
Vertical frequency = 59.94Hz

Applicable input signals
Signal_name horz_freq(khz) vert_freq (Hz)
1 525 (480) /60i 15.73 59.94
2 525 (480) /60p 31.47 59.94
3 750 (720) /60p 45.00 59.94
4 1125 (1080) /60i 33.75 59.94

(this is exactly as it appears in the manual)

I have not been able to find the maximum pixel clock or bandwidth figure in the manual.

Originally I was aiming for 1080i but I have read that the screen only has a native resolution of 1024x769. It has an aspect ratio of 16:9 and I have read that the 42� Panasonic plasma screens use non-square pixels (although I have not been able to confirm this in the manual)

I am assuming that 1080i (or as close as I can get to that resolution) is what I should be aiming for although I have read in this forum of many people who seem to prefer 720p for their various screens. To help me understand how to build a modelline for my screen perhaps someone could help me understand how to build one for 1080i?

I tried the XFree86 calculator at Sourceforge and it keeps coming back with a much smaller vertical resolution and I am wondering if that modeline calculator can’t handle non-square pixels. For example, these are the values I enter in XFree86 calculator ..

Under Monitor Configuration section:

Horizontal Sync Min = 15.73, Max = 33.75
Refresh rate = Min (left blank), Max = 59.94

Under Basic Configuration:

Visible Resolution: 1024 x 768
Refresh Rate = 59.94

Under Constrain Aspect Ratio, I set it to 16:9


Then I press the ‘calculate’ button ..

It prints out the following modeline ..

Modeline "1024x576@60" 45.77 1024 1056 1224 1256 576 587 593 605

And tells me that the Horizontal Sync Frequency = 36.44kHz

BUT I see that under the visible resolution that has been changed to: 1024 x 576 !!

What I don’t understand is why the horizontal resolution is not still showing as ‘768’, could it be related to the fact that my screen has non-square pixels?

Thanks in advance for your help,

Kevin


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PostPosted: Wed Apr 18, 2007 8:13 am 
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Joined: Mon Aug 01, 2005 9:54 pm
Posts: 77
I have the the TH-42PX60 which is just the next model year after yours, same size. Here's the output I got from powerstrip when I ran that, Hopefully it will help you.

Timing characteristics
VESA GTF support............ Not supported
Horizontal scan range....... 15-68kHz
Vertical scan range......... 59-61Hz
Video bandwidth............. 150MHz
Extension blocks............ 1
Timing recommendation #1.... 1280x720 at 60Hz
Modeline................ "1280x720" 74.250 1280 1390 1430 1650 720 725 730 750 +hsync +vsync
Timing recommendation #2.... 1920x540 at 60Hz
Modeline................ "1920x540" 74.250 1920 2008 2052 2200 540 542 547 562 +hsync +vsync
Timing recommendation #3.... 1920x1080 at 30Hz
Modeline................ "1920x1080" 74.250 1920 2008 2052 2200 1080 1084 1094 1124 interlace +hsync +vsync
Timing recommendation #4.... 720x480 at 60Hz
Modeline................ "720x480" 27.000 720 736 798 858 480 489 495 525 -hsync -vsync
Timing recommendation #5.... 720x480 at 60Hz
Modeline................ "720x480" 27.000 720 736 798 858 480 489 495 525 -hsync -vsync
Timing recommendation #5.... 720x480 at 60Hz
Modeline................ "720x480" 27.000 720 736 798 858 480 489 495 525 -hsync -vsync
Timing recommendation #6.... 1440x240 at 60Hz
Modeline................ "1440x240" 27.000 1440 1478 1602 1716 240 244 247 262 -hsync -vsync
Timing recommendation #7.... 1440x480 at 30Hz
Modeline................ "1440x480" 27.000 1440 1478 1602 1716 480 488 494 524 interlace -hsync -vsync
Timing recommendation #8.... 1440x240 at 60Hz
Modeline................ "1440x240" 27.000 1440 1478 1602 1716 240 244 247 262 -hsync -vsync
Timing recommendation #9.... 1440x480 at 30Hz
Modeline................ "1440x480" 27.000 1440 1478 1602 1716 480 488 494 524 interlace -hsync -vsync
Timing recommendation #10... 1920x1080 at 60Hz
Modeline................ "1920x1080" 148.500 1920 2008 2052 2200 1080 1084 1089 1125 +hsync +vsync

Standard timings supported
720 x 480 at 60Hz - Panasonic
1280 x 720 at 60Hz - Panasonic
1440 x 240 at 60Hz - Panasonic
1440 x 480 at 30Hz - Panasonic
1440 x 240 at 60Hz - Panasonic
1440 x 480 at 30Hz - Panasonic
1920 x 540 at 60Hz - Panasonic
1920 x 1080 at 30Hz - Panasonic
1920 x 1080 at 60Hz - Panasonic


CE standard timings supported
1280 x 720p at 59.94/60Hz (16:9) - HDTV (Native)
1920 x 1080i at 59.94/60Hz (16:9) - HDTV
720 x 480p at 59.94/60Hz (16:9) - EDTV
720 x 480p at 59.94/60Hz (4:3) - EDTV
720 x 480i at 59.94/60Hz (16:9) - Doublescan
720 x 480i at 59.94/60Hz (4:3) - Doublescan
640 x 480p at 59.94/60Hz (4:3) - Default
1920 x 1080p at 59.94/60Hz (16:9) - HDTV


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PostPosted: Wed Apr 18, 2007 9:52 am 
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Joined: Fri Dec 22, 2006 3:00 pm
Posts: 158
MrFahrenheit,

Do you know if your screen has the same native resolution as mine? (1024x768)

Also, are you using 1080p?

(I see from the Panasonic manual that 1080p is only supported via HDMI so maybe you are using 1080i as that can use component).

If you are using 1080i then the specs for your screen are identical to mine (assuming yours has the same native resolution).

I cannot see in the Panasonic manual where bandwidth is specified, how did you obtain this value?


I see that for interlaced 1080i Powerstrip produced the following modeline ..

Modeline................ "1920x1080" 74.250 1920 2008 2052 2200 1080 1084 1094 1124 interlace +hsync +vsync

I am having a hard time figuring out how this fits with a native resolution of 1024x768, presumably the TV has to down scale. I have read that it is better to stick within the limits of the native resolution, do you know anything about this?

Finally, are you using the modelines from Powerstrip as-is? I have read that sometimes modelines from Powerstrip don't work properly when applied in the Linux environment. Also, I am correct in saying that to use Powerstrip I would have to reformat (or use a different drive) and install Windows and run Powerstrip on my Myth hardware?

<EDIT> I have come to the conclusion that your screen is probably identical to mine (other than the progressive standards which mine doesn't support). I am going to try your moidelines as-is, hopefully it should be safe enough.

thanks again for your help,

Kevin


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PostPosted: Wed May 16, 2007 1:00 pm 
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Joined: Thu Apr 27, 2006 2:34 pm
Posts: 1
What kind of video card are you using? I have an nvidia card, and starting X with max logging was the key for me to getting my 42px60u working. The EDID supplied modes are displayed, and there's verbosity about whether or not the driver will allow that mode. After tweaking the settings to not reject the EDID modes (I use 'Option "ModeValidation" "AllowNon60HzDFPModes, NoVesaModes' with 1.0.9746 which also gets rid of the low res vesa modes), I was able to just cycle through the different modes and find the one that worked that I liked the best using the ctrl-alt-+ or - combinations.

Here's some of that log output...

(II) NVIDIA(0): --- Building ModePool for Panasonic PANASONIC-TV (DFP-0) ---
(II) NVIDIA(0): Validating Mode "1280x720":
(II) NVIDIA(0): 1280 x 720 @ 60 Hz
(II) NVIDIA(0): Mode Source: EDID
(II) NVIDIA(0): Pixel Clock : 74.25 MHz
(II) NVIDIA(0): HRes, HSyncStart : 1280, 1390
(II) NVIDIA(0): HSyncEnd, HTotal : 1430, 1650
(II) NVIDIA(0): VRes, VSyncStart : 720, 725
(II) NVIDIA(0): VSyncEnd, VTotal : 730, 750
(II) NVIDIA(0): H/V Polarity : +/+
(II) NVIDIA(0): Mode is valid.
(II) NVIDIA(0):
(II) NVIDIA(0): Validating Mode "1920x1080":
(II) NVIDIA(0): 1920 x 540 @ 60 Hz
(II) NVIDIA(0): Mode Source: EDID
(II) NVIDIA(0): Pixel Clock : 74.25 MHz
(II) NVIDIA(0): HRes, HSyncStart : 1920, 2008
(II) NVIDIA(0): HSyncEnd, HTotal : 2052, 2200
(II) NVIDIA(0): VRes, VSyncStart : 540, 542
(II) NVIDIA(0): VSyncEnd, VTotal : 547, 562
(II) NVIDIA(0): H/V Polarity : +/+
(II) NVIDIA(0): Extra : Interlaced
(WW) NVIDIA(0): Mode is rejected: VertRefresh (120.1 Hz) out of range
(WW) NVIDIA(0): (59.000-61.000 Hz).
<snip>
(II) NVIDIA(0): Validating Mode "1920x1080":
(II) NVIDIA(0): 1920 x 1080 @ 60 Hz
(II) NVIDIA(0): Mode Source: EDID
(II) NVIDIA(0): Pixel Clock : 148.35 MHz
(II) NVIDIA(0): HRes, HSyncStart : 1920, 2008
(II) NVIDIA(0): HSyncEnd, HTotal : 2052, 2200
(II) NVIDIA(0): VRes, VSyncStart : 1080, 1084
(II) NVIDIA(0): VSyncEnd, VTotal : 1089, 1125
(II) NVIDIA(0): H/V Polarity : +/+
(II) NVIDIA(0): Mode is valid.

I did at one point have that 1080i mode working by suppying another config option iirc. FWIW, I ended up using the 1280x720 res all the time - it looked better to me. There isn't a direct pixel addressing mode available on these plasmas, and there is always some scaling going on to interpolate to the native resolution of 1024 or whatever, but I think the 720p mode is closest to native, and produced less artifacts.


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PostPosted: Wed May 16, 2007 1:57 pm 
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Joined: Fri Dec 22, 2006 3:00 pm
Posts: 158
jojocat,
I am using the Nvidia 6150 GPU which is on my Asus M2NPV motherboard.

I did manage to get it working using modelines based on the example which MrFahrenheit had given me. Also, I made an error originally in not changing the TV mode from NTSC to HD1080i :oops:

My box is down at the moment in the process of an upgrade but when it is back up I will post my latest xorg.conf just to close the loop,

Kevin


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