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ChapmanI
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PostPosted: Sun Sep 09, 2007 10:12 pm 
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Joined: Mon May 24, 2004 10:49 pm
Posts: 112
Location: Calgary, Alberta, Canada
You're connected to a 42" HDTV via DVI. It might be a setting on the TV.

I've seen a 42" plasma with the aspect ratio set that does some weird stuff connected to a DVD. My friend is one of those "I paid for all those pixels, I want them all to be used all the time" guys. The auto aspect ratio setting stretches SD stuff, like I did with comic strip prints on Silly Putty as a kid. It drives me nuts, but he thinks it looks great.

Anyways, I've seen this Auto setting get fooled quite a few times. If there's too much black in the picture, it stretches untill the screen is filled. It has even done it in both directions at once. I can imagine the Lilo screen, which starts with just "LILO," then grows with it's line of dots. If the TV's video processor set the size from just he word LILO, it might cause something similar to what you described.

Just a thought, and worth checking out. Some TV's have a "1 to 1" setting so that it doesn't process the screen size from the input.
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dosborn278
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PostPosted: Mon Sep 10, 2007 4:32 pm 
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Joined: Mon Apr 03, 2006 7:08 pm
Posts: 39
Is there a way to tell mythtv to put a buffer around the outside of the screen?
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slowtolearn
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PostPosted: Mon Sep 10, 2007 4:40 pm 
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Joined: Wed Nov 16, 2005 8:55 pm
Posts: 1381
Location: Farmington, MI USA
dosborn278 wrote:
Is there a way to tell mythtv to put a buffer around the outside of the screen?
You can make adjustments in Utilites/Setup -> Setup -> Appearance -> 2nd screen, with the GUI Width/Height/Offset settings. This will not change the cutoff during bootup, however.
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dosborn278
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PostPosted: Mon Sep 10, 2007 5:04 pm 
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Joined: Mon Apr 03, 2006 7:08 pm
Posts: 39
I switched back to svideo which corrected the boot screen, but the channel summary while watching tv, and the screen for changes settings where still cut off. I know for a fact that in my original install, before I did a clean install with the latest version, I had everything working perfectly with svideo.
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slowtolearn
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PostPosted: Mon Sep 10, 2007 5:39 pm 
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Joined: Wed Nov 16, 2005 8:55 pm
Posts: 1381
Location: Farmington, MI USA
dosborn278 wrote:
I switched back to svideo which corrected the boot screen, but the channel summary while watching tv, and the screen for changes settings where still cut off. I know for a fact that in my original install, before I did a clean install with the latest version, I had everything working perfectly with svideo.
No ideas, sorry. I've played with so many video options (that didn't change a thing) I can't remember 1/8th of them. On my widescreens I adjust the settings as I mentioned in the post above.
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owen
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PostPosted: Fri Sep 14, 2007 3:47 am 
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Joined: Mon Mar 13, 2006 5:02 pm
Posts: 4
Location: Brisbane, QLD
I've just gone through the same issues when I hooked my 42" EDTV Panasonic Plasma to my Myth box.

Right from the time the bootsplash image appears when booting up the machine, the screen shows massive overscan. Watching anything from Mythtv was really annoying as everything looked really 'blown-up'.

I played with DVI-to-HDMI abit at first, but I switched to component-out as nvidia-settings doesn't allow adjusting of overscan when outputing on DVI. Adjusting the overscan was a dead end however, as I couldn't quite get the screen ratio to match that of the TV.

After a few nights of frustration in trying to fix it with different modelines, I settled on just feeding the TV a 720x576 (HD576p) modeline and just changed the GUI size settings in Utilities/Setup->Setup->Appearance. I ended up with width of 666, height of 544, X offset of 23 and Y offset of 13. I use the same GUI size for playback. It looks good.

Below are the relevant sections of my xorg.conf

The options "ModeValidation" and "UseEDID" are what I was using with the DVI out to stop the nvidia driver from reading the EDID of the TV, so I could try to get a specific modeline working.

Code:
Section "Monitor"
   Identifier   "Monitor0"
#        DisplaySize 920 518
#    DisplaySize 856 480
#   DisplaySize 600 300
#   [color=red]Option "ModeValidation" "NoDFPNativeResolutionCheck"[/color]
#   Option "ModeValidation" "AllowNon60HzDFPModes"
   Option "ConnectedMonitor" "TV"
        Option "DPMS"  "true"
#   [color=red]Option "UseEDID" "false"[/color]
   Option "TVOutFormat" "COMPONENT"
        Option "TVStandard" "HD576p"
#        Option "TVOverScan" "0.0"
   VendorName   "MEI"
   ModelName   "MEIa03b"
#   HorizSync    28.0 - 78.0 # Warning: This may fry very old Monitors
#   HorizSync    28.0 - 96.0 # Warning: This may fry old Monitors
#   VertRefresh  50.0 - 75.0 # Very conservative. May flicker.
#   VertRefresh  50.0 - 62.0 # Extreme conservative. Will flicker. TFT default.
   HorizSync 15.73 - 45
   VertRefresh 50 - 60
#Modeline "852x480@60" 36.67 852 896 1096 1176 480 482 494 520
#Modeline "856x480@60" 31.7 856 872 960 1064 480 481 484 497
# Modeline "856x480@75" 40.35 848 880 1032 1064 480 489 495 505
#Modeline "856x480" 33.07 852 872 912 1068 480 483 488 516 -hsync -vsync
#Modeline "720x576@60" 32.7 720 744 816 912 576 577 580 597
Modeline "720x576" 27 720 744 800 864 576 581 583 625 #27.0Mhz, 31.2 kHz, 50.0hz

EndSection

Section "Device"
   ### Available Driver options are:-
# sw_cursor is needed for some ati and radeon cards
   #Option     "sw_cursor"
   Option "UseEvents" "True"
        #Option     "hw_cursor"
        #Option     "NoAccel"
        #Option     "ShowCache"
        #Option     "ShadowFB"
        #Option     "UseFBDev"
        #Option     "Rotate"
   Identifier  "Card0"
# The following line is auto-generated by KNOPPIX mkxf86config
   Driver      "nvidia"
   VendorName  "All"
   BoardName   "All"
#   BusID       "PCI:1:0:0"
EndSection

Section "Screen"
   Identifier "Screen0"
   Device     "Card0"
   Monitor    "Monitor0"
   DefaultColorDepth 24
   SubSection "Display"
                Depth     24
                Modes "720x576"
   EndSubSection
EndSection


I've read that there is a hidden service menu on my TV that I could use to adjust the overscan on a specific input, but I plan on getting a HDMI switching/upconverting AV receiver soon so I want to see how that affects things first before I go any further.
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