Again: ATI Radeon + X11 + Formac flat display problems

[Albrecht Dreß]

I played a little with that, and had some success... As other people might 
have the same problem, here are my (preliminary) solutions.

Am 27.09.02 22:20:50 schrieb(en) Albrecht Dreß:
> (1) in text mode, I see only a 80x25 character screen centered in the 
> middle of the display, where it occupies about 1/4 of the screen. Are 
> there any kernel parameters to enlarge this? I also recognised that the=
 
> output is flickering a little bit which seems to be strange with a 
> *digitally* connected TFT. Any ideas?

Added "video=radeon:1280x1024-8@60" to the kernel args to get full-screen 
video. In the boot messages I found

radeonfb: ATI Radeon 7500 QW  DDR SGRAM 32 MB
radeonfb: DVI port no monitor connected
radeonfb: CRT port no monitor connected

This looks as if there is no check made for a monitor at the ADC port, which 
might explain the problem.

> (2) in principle, X11 runs in 1280x1024 mode, but apparently I did not 
> find the right modelines yet (strange again). Running Xconfigurator, I ge=
t:
> 
> - using a 1280x1024 monitor @ 60 Hz, X11 looks fine with 16 and 24 bits=
 
> depth, but the visible part of the display is only ~960 pixels high, 
> leaving a black border at the top and the bottom. Moving the mouse scroll=
s 
> like with a higher virtual resolution;
> 
> - using 1280x1024 @ 85 Hz and 16 bits gives a completely "noisy" display=
 
> (especially with the default X11 background).
> 
> - using 1280x1024 @ 85 Hz and 24 bits looks almost fine, but there are 
> some "artefacts" like very bright and sometimes flickering pixels at 
> window borders and in some gnome icons.

Using the modeline (actually a VESA mode w/ 60 Hz v sync at 64 kHz h sync)

"1280x1024" 108.0 1280 1328 1440 1688 1024 1025 1028 1066

I got a stable image. The flicker is *mostly* gone. However, I still can see 
flickering pixels when I run gnome's "sol" solitaire game spider. In the 
white area of playing cards, some "noise" is visible. It seems to decrease a 
little when switching form 24 bit to 15 bit color depth. This happens when 
using the ati (or the radeon) driver as well as with the fbdev driver (which 
runs only with 15 bits). Any idea?

Thanks,

	Albrecht.


-- 
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  Albrecht Dreß  -  Johanna-Kirchner-Straße 13  -  D-53123 Bonn (Germany)
        Phone (+49) 228 6199571  -  mailto:albrecht.dress@arcor.de
_________________________________________________________________________