display problem with matroxfb
Hi Petr,
Quoted 3 lines
Stop. Do you see right portion of screen in left, left portion in right, with black column in between, or is picture only shifted, without wraparound? I thought that you see wrapped display...
The display is shifted, WITH wraparound : the end of the line is at the beginning of the following one ...
Quoted 2 lines
Are you sure that it is source of problem? Default matroxfb settings for 640x480 is 'timmings 39721 48 16 33 10 96 2' - As horizontal position
No, I'm not sure ... so I've tested the parameters you mention :
timmings 39721 48 16 33 10 96 2
I copied the following block in /etc/fb.modes
mode "640x480-60"
# D: 25.200 MHz, H: 31.500 kHz, V: 59.999 Hz
geometry 640 480 640 480 8
timings 39683 48 16 33 10 96 2
accel true
rgba 8/0,8/0,8/0,0/0endmode
With these parameters, the command 'fbset -match -a' is enough to reset the display to normal operation. So, you was right.
Quoted 2 lines
After boot look at
/proc/cmdline. If it is cutted at column 64 (or 79), you have to upgrade your LILO. RedHat6.2 uses LILO with this dumb limitation.
I use Debian 2.2 and ... grub. But I've tested with lilo too. With the sae results. The cmdline is not truncated.
Quoted 3 lines
Also, you do not have to specify vesa,pixclock,hslen and vslen, as you leave them on defaults. So 'video=matrox:left:50,right:10,upper:32,lower:11' should work... But I think that only 'right:' really matters.
This does not work ... I've to use the fbset command to reset the display to normal operation after login in (or in an automatic command at boot time in /et/init.d). This works, but I've lost the logo ;-)
--
Regards
Jean-Luc
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