Help with XFree86 and LCD

Archived from groups: comp.sys.laptops,comp.os.linux.hardware (More info?)

In article <cb854160.0406080630.57d630ea@posting.google.com>,
Mariana L <themooselet@yahoo.com> wrote:
> I'm trying to configure my LCD monitor (a NEC industrial display,
> model NL 10276BC30) to work with a Silicon Motion Lynx 3DM card using
> X server v3.3.6. The card is supported under this version using
> XF86_SVGA. Now, for all Modelines I've configured that are not
> rejected as "Not valid modes", I end up getting a black screen. When
> this occur, I get no error message from X, instead the output gets
> truncated. When I give one of the invalid modes, I can get to see an
> output similar to this:
>
> (--) SVGA: Detected SMI Lynx 3DM
> (--) SVGA: using driver for chip "smi"
> (--) SVGA: using videoram 4096kB (present 8192kB)

You may need the descriptor "VideoRam" in the "Device" section. Apparently
XFree86 doesn't detect all your RAM.

> (--) SVGA: Ramdac speed 135 MHz
> (--) SVGA: Detected current MCLK value of 85.909 MHz

Not sure where that figure comes from. Maybe from the current (rejected)
mode?

> (--) SVGA: LCD Size 1024x768, type=TFT, clock 50.114 MHz
> ...
> (--) SVGA: chipset smi
> (--) SVGA: videoram: 4096k
> (**) SVGA: Using 16 bpp, Depth 16, Color weight: 565
> (--) SVGA: Maximum allowed dot-clock: 135.000 MHz
>
>
> I've read basically everything I could find about video modes
> (including VideoModes.doc, modeDB.txt,...) and still no solution.

Create your own mode (if you can find a working starting point); see
http://linux.org/docs/ldp/howto/XF [...] ngs-HOWTO/

> 1. The dot-clock I configure as second parameter on a modeline should
> correspond to which, if any, of the values seen in the output above
> (50.114 detected on the LCD, or 85.909 for the card,...)???

I'd vote for 50.114 .

> 2. Isn't it possible to configure an LCD for more than one resolution?

I've heard that it is, but an LCD looks lousy at other than its native
resolution.

> PS: I've tried basically every 1024x768 modeline posted out there,
> including all in modeDB.txt, changing the Hsync and VSync accordingly,
> without success. The user manual for the monitor is not available,
> only a datasheet from which I can hardly get any sync data.

http://www.fortecag.de/download/tft/10bc3010.pdf ?

--
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asks the barman. "Yeah, I have a parity error," replies the ASCII character.
The barman says, "Yeah, I thought you looked a bit off." -- Skud