[Openchrome-users] Acer AL2423W monitor at 1920x1200 and Samsung 1360x768 with CN700

[Zoilo Gomez]

Ondrej Wisniewski wrote:
> I had a similar issue with the CLE266 chip on a 20'' Samsung monitor 
> (1680x1050). And the fix for this was indeed a proper modeline !! But 
> don't be scared, you can use the command line tool "cvt" 
> (http://www.uruk.org/~erich/projects/cvt/) which will calculate the 
> modeline for you. You just need to provide the desired resolution and 
> refresh rate. This tool is usually installed along with the X.org server.
>   

Still didn't manage to fix this ...

I installed the tool read-edid, then (under time pressure) had to gave 
up and settled at 1680x1050 io 1920x1200, although this generates some 
flicker.

Now I have a Samsung 26" TV-set; the best resolution acc. to the 
manufacturer is 1360x768. I have exactly the same problem: the picture 
is displaced to the right by a small offset of maybe 100 pix, and there 
is black vertical bar; at the right side a small strip is missing.

My Monitor-section (as generated with read-edid) looks like this, which 
seems to be appropriate acc. to googling:

> Section "Monitor"
>     # Block type: 2:0 3:fd
>     # Block type: 2:0 3:fc
>     Identifier "SAMSUNG"
>     VendorName "SAM"
>     ModelName "SAMSUNG"
>     # Block type: 2:0 3:fd
>     HorizSync 30-61
>     VertRefresh 60-75
>     # Max dot clock (video bandwidth) 90 MHz
>     # Block type: 2:0 3:fc
>     # DPMS capabilities: Active off:yes  Suspend:no  Standby:no
>
>     Mode     "1360x768"    # vfreq 60.015Hz, hfreq 47.712kHz
>         DotClock    85.500000
>         HTimings    1360 1424 1536 1792
>         VTimings    768 771 777 795
>         Flags    "+HSync" "+VSync"
>     EndMode
>
>     # Block type: 2:0 3:fd
>     # Block type: 2:0 3:fc
> EndSection

How can I center the picture? Perhaps I can tweak one of the parameters?

Or could there be a problem with the Openchrome driver or CN700 chip set?

TIA Z.


> Note: if you use "Reduced Blanking" timings as used on LCD panels, you 
> need to set the option "AllowReducedBlanking True" in the display 
> section (?)  (IIRC) of your xorg.conf, otherwise the mode might be rejected.
>
> Ondrej
>
> Zoilo Gomez wrote:
>   
>> I have a Jeyway J7F2 mobo with CN700 chip-set, and cannot seem to get it
>> to work properly with my 24" Acer monitor at 1920x1200 resolution on VGA.
>>
>> With the simple xorg.conf file as attached, I get the following results:
>> => monitor reports 1920x1200 resolution on OSD
>> => xwininfo reports 1920x1200 resolution as well
>> => screen looks stretched out (=too big) in horizontal direction,
>> vertical resolution seems to be OK.
>>
>> I tried using "Option "VBEModes" "true", but in that case the resolution
>> falls back to 1920x1080, and the content is moved to the right, with a
>> black vertical bar on the left side of the screen.
>>
>> Can anyone confirm that a similar configurations works fine using
>> openchrome?
>>
>> Any suggestions on how to get this to work? Should I start studying the
>> scary ModeLines section?
>>
>> Z.
>>     
>
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