[ltp] external screen modes on TP765L

Tino Keitel linux-thinkpad@www.bm-soft.com
Tue, 17 Jul 2001 14:34:17 +0200

On Monday, 16. July 2001 14:31, Tino Keitel wrote:
> Hi folks,
> a few weeks ago I managed it to get a stable screen on my external 17". I
> used 2 modes, one with 60 Hz refresh rate for LCD only display and one with
> 70 Hz for the CRT. To my frustration these modes don't work anymore. Again,
> all I get is a horribly flickering picture. Since I didn't make any changes
> in my XF86Config-4 file I think there must be a magic ThinkPad related
> setup option somewhere (tpctl, ps2.exe, somewhere else). Any hints?

After playing around a little bit I found out that if I boot with the CRT 
connected and the LCD disabled, the CRT will display all modes correctly. I 
can use xvidtune to switch to the 70 Hz mode and I will get a stable piture 
on the LCD as well as on the CRT.

As soon as I enable the LCD in the boot menu (I use grub), the CRT will only 
get the fixed modes of the LCD and I got a flickering X display. xvidtune 
-next has no effect, the X display mode won't change.

Unfortunately, if I boot with the LCD disabled and go to the console to 
enable the LCD (Fn+F7) I will get a glowing white screen on the LCD (looks 
like out of sync or something). The CRT displays a mode "640x400x70". The X 
screen is still fine on both the CRT and the LCD, only the console on the LCD 
will be broken.

Is there anyone with the same behaviour or even with a solution?


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