Output problems with 945GM

[Matteo Brusa]

Jesse Barnes wrote:
> On Friday, December 07, 2007 8:30 am Matteo Brusa wrote:
>> Hi Jesse, thanks for the answer.
>> See my inline comments.
>>
>> Jesse Barnes wrote:
>>> On Thursday, December 06, 2007 5:54 am Matteo Brusa wrote:
>>>> Hi,
>>>> i have some HDTV configuration issues with my 945GM based pc, i hope i'm
>>>> in the right place to ask. I'm running Ubuntu 7.10 and therefore the
>>>> intel driver version 2:2.1.1-0ubuntu9.
>>>>
>>>> VGA output
>>>> The VGA output works great, it uses the 1360x768 resolution when plugged
>>>> to an HDTV. Unfortunately, my actual TV has no VGA input, so i'm trying
>>>> to get either HDMI (with DVI adapter cable) or component running.
>>>> LDVS
>>>> In X, LVDS is always enabled although i have no LCD screen. I tried
>>>> "xrandr --ouput LDVS --off" without success, and the intel module does
>>>> not support any xorg.conf option to shut it off. Could this be the
>>>> reason why xvidtune always shows 1024x768 and not the actual screen
>>>> value? Component I always get 1024x768, no matter which Modeline i
>>>> specify. Any suggestion?
>>> You actually can disable it:
>>>
>>> Section "Monitor"
>>> 	Identifier "Bogus LCD"
>>> 	Option "ignore" "true"
>>> EndSection
>>>
>>> Section "Driver"
>>>         Identifier "Card0"
>>>         Driver "intel"
>>>         VendorName "Intel Corporation"
>>>         BoardName "Unknown Board"
>>>         Option "Monitor-LVDS" "Bogus LCD"
>>> EndSection
>>>
>>> And since we've been getting so many reports about this stuff and always
>>> end up pointing people at
>>> http://www.intellinuxgraphics.org/dualhead.html, I think I'll update the
>>> man page with some more detail...
>> Great, this works.
>> That would be really helpful to have this mentioned in the man page.
> 
> I added some more detail to the git tree, hopefully it'll help head off future 
> FAQs. :)
> 
>>>> TDMS-1
>>>> I got 1280x768 working, with noticeable overscan. How can i use the same
>>>> 1360x768 with DVI, or get rid of the overscan?
>>> What's the output of 'xrandr'?
>> Here's the snippet relative to this output:
>> TMDS-1 connected 1280x720+0+0 (0x62) normal (normal left inverted right)
>> 160mm x 90mm Identifier: 0x4e
>>          Timestamp:  -1361725529
>>          Subpixel:   horizontal rgb
>>          Clones:
>>          CRTC:       0
>>          CRTCs:      0 1
>>          EDID_DATA:
>>                  00ffffffffffff004c2d000200000000
>>                  2a0f01038010098c0ae2bda15b4a9824
>>                  15474a20000001010101010101010101
>>                  010101010101011d007251d01e206e28
>>                  5500a05a0000001e011d00bc52d01e20
>>                  b8285540a05a0000001e000000fd0032
>>                  3d0f2e08000a202020202020000000fc
>>                  0053414d53554e470a202020202001af
>>    1280x720 (0x62)   74.2MHz +HSync +VSync
>>          h: width  1280 start 1390 end 1430 total 1650 skew    0 clock  
>> 45.0KHz v: height  720 start  725 end  730 total  750           clock  
>> 60.0Hz 1280x720 (0x63)   74.2MHz +HSync +VSync
>>          h: width  1280 start 1720 end 1760 total 1980 skew    0 clock  
>> 37.5KHz v: height  720 start  725 end  730 total  750           clock  
>> 50.0Hz 640x480 (0x64)   25.2MHz -HSync -VSync
>>          h: width   640 start  656 end  752 total  800 skew    0 clock  
>> 31.5KHz v: height  480 start  490 end  492 total  525           clock  
>> 60.0Hz
> 
> Hm, I think using DVI is your best bet (it'll probably give you the best 
> picture quality) but your TV doesn't seem to provide a 1360x768 resolution in 
> its EDID data?  Or are you overriding it somehow?
> 
> Can you post your xorg.conf and Xorg.0.log files?

I auto reconfigured X with the VGA cable plugged, see attached file. Interesting note, when 
connected via the DVI-HDMI cable, the monitor offers no EDID info whatsoever.
I also attach the Xorg.0.log files for both VGA and TDMI-1.
The VGA output clearly runs at 1360x768 without overscan, while the TDMI-1 runs at 1280x720 with 
overscan. Still i couldn't reach digital 1360x768.
Is it true, that in order to accept my custom modelines, i have to specify 'Option "DDC" "off"' in 
the device section?
Last but not least, is there an 'official' Modeline for 1920x1080p?

As always, any help will be mostly appreciated.
Matteo



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