[Solved] Problems with 1080 @ MS-7329, black bar on the left

[patmankn]

Dear all,

i just installed LinuxMCE another time, just to check if screwed my system once more ;O)
As i recently bought a new LCD, i would love to make use of the 1080 resolution.
But the moment i switch to 1080, the picture starts to show a black bar on the left side.
It just looks, like the picture is move to the right for some dozens pixels.
This just shows up when i set the LCD to pixel by pixel mode AND set the AVWizard to DVI, 1080, 60Hz.
In 720p the black bar is gone.
Does anybody in the community shares the same experience?
A work around is, to NOT use the pixel by pixel feature and setup the screen to my needs (reduce size, move left).
But i think, the picture quality is not as good.
I run the nvidia driver out of the box. Last time driver update did not help.
For checking my LCD, i installed WinXP with latetst nvidia driver, which gave me a solid 1920x1200 @ 50Hz 

Thanks for all your help and keep up the work... you guys rock! ;O))

Patrick

[colinjones]

Couple of thoughts, Patrick:

- Have you determined what the actual "native" resolution of the panel is? This is a very important point when it comes to picture quality and just because a panel (esp LCD) says it can handle 1080 doesn't mean that this is its native resolution. They all have scalers built in, and you will usually get the best possible picture quality if you match the native resolution so that the TV scaler doesn't come into play. The GPU scaler might, but this is often better anyway.

- It sounds like the GPU is not correctly determining the mode timings of your display. Have you turned out UseEDID? This doesn't necessarily make things better (although it often does), but it does give you much more info in the Xorg.0.log file so that you can troubleshoot what is happening. And it may give you a lead on a specific modeline that will fix the problem.

- You should look your display up in the linuxtv.org modeline database as someone may already designed an appropriate modeline for it.

[LegoGT]

I had a similar problem with my 42" Westinghouse and an NVIDIA 8600GTS. The solution (for me) seems a little Rube Goldberg-esque but it did work. Basically, you need to adjust the porch values to shift the timing of each line.

Usually, you would either run a command like "gtf 1920 1080 60 -x" to get your Modeline or even look through the Xorg.0.log file but neither of those worked for me.

Hopefully, you still have XP installed with the newest driver. Using the NVIDIA control panel, open the "Manage Custom Resolutions" panel then click on create. Write down all the numbers listed for your monitor. You'll use these to build the custom Modeline. Here's what I got for my monitor:

Horizontal:
-- front porch: 88
-- active pixels: 1920
-- total: 2200
-- sync width: 44
-- polarity: +

Vertical:
-- front porch: 4
-- active pixels: 1080
-- total: 1125
-- sync width: 5
-- polarity: +

Pixel Clk: 148.5000

Here's the final line I used in xorg.conf:
Modeline "1920x1080" 148.5 1920 2008 2052 2200 1080 1084 1089 1125 +hsync +vsync

How I got the values:
148.5 = pixel clk
1920 = horizontal resolution
2008 = 1920 + front porch
2052 = 2008 + sync width
2200 = total (or previous + back porch)
1080 = vertical res
1084 = 1080 + front porch
1089 = 1084 + sync width
1125 = total (or previous + back porch)

Oh, yeah, I was tweaking this on a diskless Media Director and Xconfigure.sh kept overwriting my xorg.conf on reboots. The wiki mentions a workaround by adding "exit 0" at the top of the file to prevent this. Once you figure out the proper settings you should probably rewrite the script, though.

Hope that helps!

[patmankn]

Thanks guys!

I'll check tonight if i can slap my system once more with your help!
I keep you updated. ;O)

Patrick

[patmankn]

LegoGT,

your hint was just what I needed. I knew, that the modelines are the problems, but with your perfect "for-noobs-walk-through"... my LMCE just looks as pretty as possible!

Ok, for the record :

Sharp LE37X20E

Code: [Select]


Section "Monitor"
    Identifier     "Generic Monitor"
    Option         "DPMS"
Modeline "1920x1080" 148.5 1920 2448 2492 2640 1080 1084 1089 1125 +hsync -vsync
HorizSync 20-500
VertRefresh 50-61
EndSection


Horizontal:
-- front porch: 528
-- active pixels: 1920
-- total: 2448
-- sync width: 44
-- polarity: +

Vertical:
-- front porch: 4
-- active pixels: 1080
-- total: 1125
-- sync width: 5
-- polarity: -
backporch
Pixel Clk: 148.5000

so, colinjones, LegoGT.... you really made my day ;O)

Patrick

[colinjones]

Patrick - please make sure that you go to the modeline database of linuxtv.org and add that modeline to the db for your model TV. It is an important resource for us all!

[patmankn]

Colin,

i just add the settings to http://www.mythtv.org/wiki/index.php/Modeline_Database#Sharp_LC-37X20E .
Hopefully you ment the mythtv Modeline DB, as I couldn't find something similar at linuxtv.org .  ;O)

Pat

[colinjones]

Sorry, my bad! Wasn't thinking straight, that's exactly the one I meant!

[patmankn]

I just found some more settings...
Use them at your own risk:

Code: [Select]


Modeline "1920x1080@25" 74.25 1920 2560 2608 2752 1080 1084 1089 1125 +hsync +vsync
        Modeline "1920x1080@24" 74.16 1920 2558 2602 2750 1080 1084 1089 1125 +hsync +vsync
        Modeline "1920x1080@50" 148.5 1920 2448 2492 2640 1080 1084 1089 1125 +hsync +vsync         
        Modeline "1920x1080@60" 148.5 1920 2008 2052 2200 1080 1084 1089 1125 +hsync +vsync


I still try to find out, what fits best to my needs.
24hz "sounds" cool, but actuallly, the picture is a) slow b) not smooth as with 50Hz OR 720p.
So i think a need a new graphic card... ;O(

[colinjones]

To be honest, I don't think you should ever have any reason to use 24Hz, this is a film mode and any digital media you have will have already been frame doubled or pull downed.

25Hz would typically only be a PAL interlaced mode and refers to the frame rate not the field rate, so wouldn't achieve anything either.

Your email address suggests you are in Germany, so if you have 50Hz available, I would suggest that for maximum smoothness in TV watching...

[patmankn]

I appreciate your advice Collin!

this just matches my "experience", as i said... 24 "sounds" cool ;O)
At least, i know my LCD can handle it.
I just wanted to share, what's "possible", and how.

Thanks for your help and advice...

Pat