Output problems with 945GM
Matteo Brusa
matteo.brusa at kaasa.com
Fri Dec 14 05:49:44 PST 2007
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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