[mythtv-users] New LCD TV - complains about 'mode not supported'

C.T. Paterson i.adore.my.64 at gmail.com
Tue Aug 5 12:03:13 UTC 2008


2008/8/5 David Whyte <david.whyte at gmail.com>:
> Hi all,
>
> Bought a new Samsung 32" TV (Series 4 if it is important) for my
> bedroom and hooked it up to my mythtv box via a DVI to HDMI cable.
> When I booted the box, you could see the mythbuntu boot up screens but
> when it logged into the desktop it comes up with a message about the
> 'mode is not supported'.
>
> I imagine that this is just a resolution issue, but I have no real
> idea how to fix it.  I tried doing a dpk-reconfigure xserver-xorg but
> that didn't even list the 1366x768 resolution (or anything similar).
>
> Looking in the xorg.log, it has the following lines:
>
> (II) intel(0): Printing probed modes for output TMDS-1
> (II) intel(0): Modeline "1360x768"x60.0   85.50  1360 1424 1536 1792
> 768 771 777 795 +hsync +vsync (47.7 kHz)
> (II) intel(0): Modeline "1280x720"x60.0   74.25  1280 1390 1430 1650
> 720 725 730 750 +hsync +vsync (45.0 kHz)
> (II) intel(0): Modeline "1024x768"x60.0   65.00  1024 1048 1184 1344
> 768 771 777 806 -hsync -vsync (48.4 kHz)
> (II) intel(0): Modeline "800x600"x60.3   40.00  800 840 968 1056  600
> 601 605 628 +hsync +vsync (37.9 kHz)
> (II) intel(0): Modeline "640x480"x60.0   25.20  640 656 752 800  480
> 490 492 525 -hsync -vsync (31.5 kHz)
>
> which seem to indicate that the 1360x768 modeline is good but I have
> no idea how best to configure my PC to work.
>
> For the record, the specs are as follows:
>
> AOpen MP915-X miniPC
> Intel 915GM graphics chip
> Output via DVI.
> mythbuntu Gutsy
>
> Anybody here kind enough to give me a hand configuring up my new TV?

I haven't googled your particular brand of television - but one thing
I learned on my own odyssey of getting my LCD working is that the
modelines published by the TV are not necessarily true.  You might
consider googling to see if that's true of yours.

IIRC, I had to add the following TWO lines to my xorg.conf in the
device section:

    Option      "UseEDID"       "False"
    Option      "ModeValidation"        "NoEdidModes, NoMaxPClkCheck,
NoVertRefreshCheck, NoHorizSyncCheck, NoEdidMaxPClkCheck"

This tells xorg to ignore the modelines published by the TV.

I believe then you should come up in a low-graphics mode that your TV
will be more willing to tolerate.  You can then use "gtf" or
"xvidtune" on the command line to generate a 1360x768 modeline.  Put
that modeline in your xorg.conf's Monitor section and then set the
mode in your Screen section.


On the TV side, make sure the resolution is set correctly (mine
supported four resolutions; 1360x768 being only one of them), and
check your manual to ensure that the resolution is supported into your
HDMI input.  I've seen different inputs support different resolutions
before.

Cheers.

-- 
"My country is the world, and my religion is to do good."
 -- Thomas Paine


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