1080i/p not 1920 x 1080 Huh? - Canadian TV, Computing and Home Theatre Forums
LinkBack Thread Tools Search this Thread Display Modes

post #1 of 7 (permalink) Old 2010-03-31, 01:01 AM Thread Starter
Join Date: May 2009
Location: Near the Hills
Posts: 632
1080i/p not 1920 x 1080 Huh?

Panasonic TCP-54V10 1080P display.
Windows 7 Ultimate running Media Centre via ATI4200 on board.

HDMI run into Pioneer VSX-1019 AVR.

TV boxes show 1080 full screen corner to corner.
HTPC 1080i/p or even 720p images seem to be underscanned by 5 to 10%, even when showing BluRay at full screen.

Why am I not getting the full 1920 x 1080 experience?
Moose57 is offline  
Sponsored Links
post #2 of 7 (permalink) Old 2010-03-31, 01:42 AM
OTA Forum Moderator
Join Date: Jan 2005
Posts: 24,878
Does the ATI driver software have an overscan/underscan compensator, or does the Pioneer AVR?
stampeder is offline  
post #3 of 7 (permalink) Old 2010-03-31, 01:49 AM
Join Date: Dec 2007
Location: SaskTel
Posts: 1,101
ati are notorious for underscan by default

you can go into the menu to fix it np
Tikker is offline  
post #4 of 7 (permalink) Old 2010-03-31, 11:12 AM
Join Date: Mar 2010
Location: Edmonton
Posts: 338
You'll have to go into your "ATI Control Panel" and go to "Display Devices" and right click on your device and hit properties. Once in there you can change overscan settings (move the slider to the right to get a bigger picture), as well as manage saturation/hue settings, pixel mapping among other things.

When I first plugged my HD4890 into my TV i was missing over an inch of picture before I adjusted the overscan settings.
WetCardboard is offline  
post #5 of 7 (permalink) Old 2010-03-31, 11:29 AM
Join Date: Nov 2003
Location: Calgary
Posts: 2,771
The underscan by default is a concept from the era of the rear-projection TVs. At that time ATI didn't have any overscan compensation, let alone by default. People requested it, and it looks like the request has finally been fulfilled. Right about the time the RPTVs and the need of overscan correction are already dead. In the next few months ATI's software gurus will realize that, make a note to remove the default underscan, and within 4-5 years it will be done.
Arthur Dent is offline  
post #6 of 7 (permalink) Old 2010-03-31, 03:47 PM
Join Date: Apr 2008
Posts: 178
Double check your HDTV manual and configuration. My Tosh has various view settings by input with and without overscan.
ericball is offline  
post #7 of 7 (permalink) Old 2010-04-02, 06:05 PM Thread Starter
Join Date: May 2009
Location: Near the Hills
Posts: 632

Didn't find any over/under scan compensation settings in the driver and what was there was greyed out.
No slider bars in the CCC to adjust either.
BTW, it's the latest Catalyst 10.3 package I'm using.

I reset the drivers to default and solved my 1080i OTA stutter problem.
And here a weird one;
On the PC desktop, it's now FULL screen and the setting is 1920x1080 24Hz
When in the media centre, it goes to 1920x1080 60p and this is where the underscan occurs.

I would have expected the OS driver to pass through to the WMC operations.

I also stumbled across the pane that allows me to diddle with the interleave method from Bob to Weave to various Adaptive modes.

What is recommended for 1080i OTA source material?
Have NO problems with 480i SD via catv, so is it possible the ATI interlace bug only affects 1080i?

Before the reset, I was playing with ALL the interleave settings and nothing helped.
I was almost resigned to buying an ATI 5670 for the extra power, but may wait as it seems OK for now and 1080p BD has always been OK.

I'll have another look at the TV and AVR settings.
Maybe try direct to display to isolate any AVR interference, but all the other STB's device are run through it with a single HDMI output to the plasma with no issues.
There is a TSTV box, a HD FTA box and a PBO, all 100%
Moose57 is offline  

Quick Reply

Register Now

In order to be able to post messages on the Canadian TV, Computing and Home Theatre Forums forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:


Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.

Thread Tools Search this Thread
Show Printable Version Show Printable Version
Email this Page Email this Page
Search this Thread:

Advanced Search
Display Modes
Linear Mode Linear Mode

Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

For the best viewing experience please update your browser to Google Chrome