[mythtv-users] Sharp LC-42D64U and xorg

Erik Sejr esejr at wildroseinternet.ca
Mon Sep 15 15:40:29 UTC 2008


Hi,
I have had MythTV up and running at 1080p on the older sharp 42" LCD but I
recently moved and purchased a new LC-42D64U since I liked my old unit.
When I first booted up my Myth machine connected to this new TV it seemed
to just lock up. Upon closer inspection I found I was able to boot into
text mode ok, the problem only seemed to happen when the system tried to
start the X server. It seems when X tries to initialize the display it just
locks up. If I try to start X at 1920x1080 I get a black screen on the
display and the system doesn't appear to load X. Control-Alt-Backspace does
not get me back to the prompt - I have to reboot. If I start it at a lower
resolution (say 640x480) I get the same thing on the screen (nothing) but I
CAN use control-alt-backspace to kill X and return to the prompt. Also,
based on the hard disk activity and messages after killing the server, X
appears to load normally at this resolution but the display remains black.

I read the EDID information from the using monitor-edid (This machine is
running Fedora 7):

Name: SHARP HDMI
EISA ID: SHP0ffb
Screen size: 82.0 cm x 46.0 cm (37.02 inches, aspect ratio 16/9 = 1.78)
Gamma: 2.2
Digital signal
Max video bandwidth: 170 MHz

        HorizSync 15-75
        VertRefresh 55-76

        # Monitor preferred modeline (60.0 Hz vsync, 67.5 kHz hsync, ratio
16/9)
        ModeLine "1920x1080" 148.5 1920 2008 2052 2200 1080 1084 1089 1125
+hsync +vsync

        # Monitor preferred modeline (60.0 Hz vsync, 47.7 kHz hsync, ratio
16/9)
        ModeLine "1360x768" 85.5 1360 1424 1536 1792 768 771 777 795 +hsync
+vsync

Here's the pertinent sections of xorg.conf:

Section "Screen"

    Identifier     "Screen0"
    Device         "Videocard0"
    Monitor        "Monitor1"
    DefaultDepth    24
    Option         "Connected Monitor" "DFP"
    Option         "ExactModeTimingsDVI" "True"
    SubSection     "Display"
        Viewport    0 0
        Depth       24
        Modes      "1920x1080"
    EndSubSection
EndSection

Section "Monitor"
    Identifier     "Monitor1"
    VendorName     "Sharp"
    ModelName      "42 Inch 1080p LCD HDTV"
    HorizSync       15.0 - 75.0
    VertRefresh     55.0 - 76.0
    ModeLine       "1920x1080" 148.5 1920 2008 2052 2200 1080 1084 1089
1125 +hsync +vsync
    Option         "DPMS" "True"
EndSection

Section "Device"
    Identifier     "Videocard0"
    Driver         "nvidia"
    VendorName     "Videocard vendor"
    BoardName      "nVidia Corporation C51 PCI Express Bridge"
EndSection

The video card is a Geforce 6150, Nvidia driver is version 173.14.05. The
monitor is connected via a DVI->HDMI cable. I ran startx -- -verbose 5
-logging 5. The log is too big to post and will make a mess of this
message, but here are the interesting parts that I believe may be the cause
of this problem:

(II) NVIDIA(GPU-0): No display devices connected; falling back to: CRT-0
(WW) NVIDIA(GPU-0): Unable to read EDID for display device CRT-0
(II) NVIDIA(0): NVIDIA GPU GeForce 6150 (C51) at PCI:0:5:0 (GPU-0)
(--) NVIDIA(0): Memory: 262144 kBytes
(--) NVIDIA(0): VideoBIOS: 05.51.22.33.07
(--) NVIDIA(0): Interlaced video modes are supported on this GPU
(--) NVIDIA(0): Connected display device(s) on GeForce 6150 at PCI:0:5:0:
(--) NVIDIA(0):     CRT-0
(--) NVIDIA(0): CRT-0: 350.0 MHz maximum pixel clock
(II) NVIDIA(0): Assigned Display Device: CRT-0
(II) NVIDIA(0): Validated modes:
(II) NVIDIA(0):     "800x600"
(II) NVIDIA(0): Virtual screen size determined to be 800 x 600
(WW) NVIDIA(0): Unable to get display device CRT-0's EDID; cannot compute
DPI
(WW) NVIDIA(0):     from CRT-0's EDID.
(==) NVIDIA(0): DPI set to (75, 75); computed from built-in default
(==) NVIDIA(0): Enabling 32-bit ARGB GLX visuals.
(--) Depth 24 pixmap format is 32 bpp

Why can't it seem to find the display even when it is plugged in and
operating in text mode? Any thoughts on how to get around this? Has anyone
got Myth working on this TV? If so I'd love to have a look at your
xorg.conf.

Your help is greatly appreciated.

Regards,
Erik



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