[ltp] Thinkpad i1230

[James Mckenzie]

"Thomas R. Dean" wrote:

> My questions have to do with X.  The screen is
> a 13" 800x600 HPA screen. It is not a TFT (or at least
> they do not advertise it as such).  I'm not sure what
> the technology is. The screen is fine for my purposes.
> 

I would definately pick a TFT screen over a DSTN/HPA, but if the screen
meets your needs...

> For the first attempt I set it to LCD screen 800x600.
> This caused problems as the chip set (SMI Lynx EM4+)
> would not generate the frequency (VRefresh 60). I
> manually broadened the VRefresh to 55-65, and got
> X up and running. A second install (after I figured out how
> to have both win95 and linux partitions) I set the screen to
> IBM TFT. This gave a VRefresh range of 55-170.
> I manally reduced this since I have to be able to hook
> this up to an external projector and tested it with an
> external Komodo 14" monitor.
> 
Usually you end up with a range, which is narrowed by the selection of a
monitor.  I would suggest picking a monitor that has a MAXIMUM of the
range that you are looking for when setting up your system.

> My questions are:
> 
>   1. Are there any restrictions on the frequencies that
>      will be accepted by the HPA screen.  Older CRT
>      monitors could be damaged by out of spec
>      frequencies. Do I have to worry about this with
>      the HPA screen? I'm not sure to what extent the
>      TFT scan rates are applicable to HPA screens.

I know that the TFT will NOT work with a refresh rate of over 60Hz on
either a 760ED or 600E.  I would suspect that this is true with the HPA
as they both use the same 'driver' board.

> 
>   2. If the external monitor is hooked up when I start X,
>       everything is fine. However, if i use Fn-F4 to switch
>       while X is running, the external monitor (Komodo)
>      goes out of range (the leds on the front blink back
>      and fourth) and when the LCD comes back on, it is
>      in a wierd mode which flickers, is double interflaced,
>      and X locks up. Ctrl-Backspace stops X and
>      everything is fine.  X can be restarted at that point
>      and everything is fine again. While I don't expect to
>      be switching, the behaviour was unexpected.
>      Why would it change scan rates?

What are you trying to state here?  If you start with your system set to
use the external monitor and you switch away from it, the monitor goes
"nuts" or that when you switch from the LCD panel to the monitor, the
monitor fails to sync and when you switch back that the LCD screen lost
sync too and you have to 'crash' X to restore the settings?

If it is the latter, this might be a limitation of the monitor and it is
'feeding back' to the external monitor port and setting the system to an
unsupported mode for the LCD screen and when switched back, the LCD
cannot sync because the vertical sync is higher than 60Hz...

The solution is to hard lock X for 60Hz at 800x600.

> -----BEGIN GEEK CODE BLOCK-----
> Version: 3.12
> GCS/CC/S d+(-) s:++>+ a C++(++++) ULAS++++$ P--- L+++ E---
> W++ N+(++) o? K? w---() O M+ V(-) PS++ PE Y+ PGP t+@
> 5++ X+ R(+) tv+ b+++ DI+ D G e++++ h- r- y?
> ------END GEEK CODE BLOCK------

I need to update my Geek block and lost the location for it.


James Mckenzie
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