View unanswered posts    View active topics

All times are UTC - 6 hours





Post new topic Reply to topic  [ 1 post ] 
Print view Previous topic   Next topic  
Author Message
Search for:
PostPosted: Thu Jan 01, 2009 9:58 am 
Offline
Joined: Thu Aug 02, 2007 5:16 pm
Posts: 57
I had to do quite a bit of Xorg.conf hacking to get my projector to work properly with Myth, so I thought I'd share. 1) If you're using the same projector as me, you're in luck. 2) Maybe your TV is exhibiting the same issues.

First of all, more details on my setup. I am using a DVI->HDMI cable, connected through an ONKYO-SR-705 receiver. (Receiver switches between 3 HDMI sources, passing 1 through to my projector.)

My problem is that the EDID information being reported by my projector covered too many modes, and Myth was selecting an invalid one. Also, since I'm using a HDMI-pass-through switch, I wanted to be able to boot-up the MythBox without ensuring that the Onkyo was tuned to the MythBox to enable the EDID handshake. But, the primary issue was - EDID wasn't working.

So, with EDID enabled, I looked up the modes being reported by my setup in /var/log/Xorg.0.log, and copied the modes that were listed in my owner's manual as being optimal for my projector.

I then shut EDID off. Now, here I ran into a real issue that was difficult to track down, and I think this is the primary value of my post.

I had to get 2 things to happen.

1) Force X to recognize the resolutions I was specifying, and not reject them with the error "Mode is too large for DFP Native Resolution"

The key action for this was to add this line to my Xorg.conf Screen section

Code:
        Option     "ExactModeTimingsDVI" "True"


This tells xorg.conf to use the exact modes specified in xorg.conf. Otherwise, for DVI connections, it defaults to matching the mode you specify with the closest mode from EDID or X, etc.

I also wanted to make absolutely certain there weren't errant modes sneaking into my configuration, so I threw every flag on turning off modes from other sources, again in the screen section.



Code:
        Option     "ModeValidation" "NoXServerModes, NoPredefinedModes, NoVesaModes, NoEdidModes, NoDFPNativeResolutionCheck, AllowNon60HzDFPModes, NoEdidDFPMaxSizeCheck"


Also, an initial issue I had was getting my nVidia GeForce 7600 to send the signal out the DVI port. I forced that with this flag.

Code:
Option "ConnectedMonitor" "DFP"


The Device, Monitor, and Screen sections of my xorg.conf file follows. I hope this information is helpful to someone!! Also, I'm sure I have some unnecessary flags, etc. flipped, but it works, and I don't see any errors thrown in /var/log/Xorg.0.log, so I'm going with it!

The only issue I have is that DPI is defaulting to 75x75. The EDID data from my projector gave no information. The image looks good to me at 75x75, but if anyone has any recommendations on calculating an optimal value for this settiing, I'd be all ears.

Code:
Section "Device"
        ### Available Driver options are:-
        #Option     "sw_cursor"
        #Option     "hw_cursor"
        #Option     "NoAccel"
        #Option     "ShowCache"
        #Option     "ShadowFB"
        #Option     "UseFBDev"
        #Option     "Rotate"
        Option     "UseEDID" "False"

        Option      "UseEvents" "True"
        Identifier  "Videocard0"
# The following line is auto-generated by KNOPPIX mkxf86config
        Driver      "nvidia"
        VendorName  "All"
        BoardName   "All"
#       BusID       "PCI:1:0:0"
        Option "XvmcUsesTextures" "false"
        #Option "NVAGP" "2"
EndSection

#------------------------------------------------------------------------------
# From Page 50 of the Panasonic PT-AE3000U Owner's Manual
#------------------------------------------------------------------------------
#
# Mode              | Display   | (dots)        | Scanning       | Dot  | Pic |
#                   |           |               | Frequency      | Clk  | Qual|
#                   |           |               | H (kHz)| V (Hz)|      |     |
#-----------------------------------------------------------------------|     |
#   525p (480p)     |   525p    |   720 x 483   | 31.5   | 59.9  | 27.0 | A   |
#   635p (576p)     |   625p    |   720 x 576   | 31.3   | 50.0  | 27.0 | A   |
# 1 125 (1 080)/60i | 1 125/60i | 1 920 x 1080i | 33.8   | 60.0  | 74.3 | AA  |
# 1 125 (1 080)/50i | 1 125/50i | 1 920 x 1080i | 28.1   | 50.0  | 74.3 | AA  |
# 1 125 (1 080)/24p | 1 125/24p | 1 920 x 1080  | 27.0   | 24.0  | 74.3 | AA  |
# 1 125 (1 080)/60p | 1 125/60p | 1 920 x 1080  | 67.5   | 60.0  |148.5 | AA  |
# 1 125 (1 080)/50p | 1 125/50p | 1 920 x 1080  | 56.3   | 50.0  |148.5 | AA  |
#   750   (720)/60p |   750/60p | 1 280 x  720  | 45.0   | 60.0  | 74.3 | AA  |
#   750   (720)/50p |   750/50p | 1 280 x  720  | 37.5   | 50.0  | 74.3 | AA  |
#------------------------------------------------------------------------------
#
# *1. The "i" appearing after the resolution indicates an interlaced signal
# *2. AA = Maximum picture quality can be obtained
#      A = Signals are upconverted by the projector's image processing circuit
#------------------------------------------------------------------------------

Section "Monitor"
        Identifier "Monitor0"
        VendorName "Panasonic"
        ModelName  "PT-AE3000U 1080p Projector"
        HorizSync  27.00-67.5
        VertRefresh 24.00-60.00

#----------------------------------------------------------------------
# Mode timings were determined by allowing the Mythbox to query
# EDID information, then comparing the modes reported by EDID
# in /var/log/Xorg.0.log with the Owner's Manual supported
# resolutions. (See table above.)
#  I specify modes for the resolutions supported
# by my monitor that I want to use.  The EDID information specified
# too many modes, and Myth selected a poor resolution, rendering the
# menus and playback windows larger than the screen image area.
#----------------------------------------------------------------------

        Mode "Panasonic_720x576@50"
             DotClock 27.00
             HTimings  720  732  796  864
             VTimings  576  581  586  625
             Flags "+HSync" "+VSync"
        EndMode

        Mode "Panasonic_1920x1080i@60"
             DotClock 74.18
             HTimings 1920 2008 2052 2200
             VTimings 1080 1084 1094 1124
             Flags "+HSync" "+VSync" "Interlace"
        EndMode

        Mode "Panasonic_1920x1080i@50"
             DotClock 74.25
             HTimings 1920 2448 2492 2640
             VTimings 1080 1084 1094 1124
             Flags "+HSync" "+VSync" "Interlace"
        EndMode

        Mode "Panasonic_1920x1080@24"
             DotClock 74.16
             HTimings 1920 2558 2602 2750
             VTimings 1080 1084 1089 1125
             Flags "+HSync" "+VSync"
        EndMode

        Mode "Panasonic_1920x1080@60"
             DotClock 148.35
             HTimings 1920 2008 2052 2200
             VTimings 1080 1084 1089 1125
             Flags "+HSync" "+VSync"
        EndMode

        Mode "Panasonic_1920x1080@50"
             DotClock 148.5
             HTimings 1920 2448 2492 2640
             VTimings 1080 1084 1089 1125
             Flags "+HSync" "+VSync"
        EndMode

        Mode "Panasonic_1280x720@60"
             DotClock 74.18
             HTimings 1280 1390 1430 1650
             VTimings  720  725  730  750
             Flags "+HSync" "+VSync"
        EndMode

        Mode "Panasonic_1280x720@50"
             DotClock 74.25
             HTimings 1280 1720 1760 1980
             VTimings  720  725  730  750
             Flags "+HSync" "+VSync"
        EndMode

EndSection

Section "Screen"
        Identifier "Screen0"
        Device     "Videocard0"
        Monitor    "Monitor0"

        Option "UseEDID" "False"
        Option "ConnectedMonitor" "DFP"

        Option      "IncludeImplicitMetaModes" "FALSE"
        Option     "ExactModeTimingsDVI" "True"
        Option     "ModeValidation" "NoXServerModes, NoPredefinedModes, NoVesaModes, NoEdidModes, NoDFPNativeResolutionCheck, AllowNon60HzDFPModes, NoEdidDFPMaxSizeCheck"

        Option "AddARGBGLXVisuals" "True"

SubSection "Display"
Viewport 0 0
Depth 24

#Modes "Panasonic_720x576@50" "Panasonic_1920x1080i@60" "Panasonic_1920x1080i@50" "Panasonic_1920x1080@24" "Panasonic_1920x1080@60" "Panasonic_1920x1080@50" "Panasonic_1280x720@60" "Panasonic_1280x720@50"

Modes "Panasonic_1920x1080@60" "Panasonic_1280x720@60"

EndSubSection

EndSection



Top
 Profile  
 

Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 1 post ] 


All times are UTC - 6 hours




Who is online

Users browsing this forum: Bing [Bot] and 2 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Jump to:  
Powered by phpBB® Forum Software © phpBB Group

Theme Created By ceyhansuyu