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Old 08-26-2007, 09:39 PM   #1
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Unhappy Slackware 12 & Xorg Video Problem

I am using slackware 12 with a sis730s chipset motherboard and I am having a problem with xorg.

I have slackware to use sisfb with the mode set to 1280x1024x32 and rate of 60hz and I configured xorg to work using the sis driver. Xorg starts fine in 1280x1024x32 mode at 60Hz, but the screen is significantly off center. I tried using xvidtune and it does allow me to center my screen but the "show" button doesn't work. I did produce a modeline which I added to my xorg.conf that used the refined xvidtune (centered screen) values but it simply did not correct the off centered screen. I then installed sisctrl and ran that, which listed two 1280x1024x32 60hz modes, the top one being the current one in use (off centered display) and the 2nd one actually correcting the off center nature of my display, but this was only a temporary fix.

How can I instruct xorg to use the sisctrl listed 1280x1024x32 (60hz) mode which is displayed centered vs the other 1280x1024x32 (60hz) that isn't? Or how can I fix the xorg.conf to display my screen correctly as my modelines simply weren't being used?
Old 08-27-2007, 01:18 AM   #2
Registered: Jul 2006
Location: Gießen, Germany
Distribution: Slackware64-14.2
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I don't you just center your screen using the button menu of your monitor?
Old 08-27-2007, 06:54 AM   #3
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Originally Posted by tramni1980 View Post
I don't you just center your screen using the button menu of your monitor?
If I center the graphic screen then the text screen (sisfb) is off centered too.
Old 08-27-2007, 09:15 AM   #4
Registered: Jan 2007
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Did you try without fb? (vga = normal in /etc/lilo.conf)
Old 08-28-2007, 10:26 AM   #5
Registered: Jul 2004
Location: Boston, MA
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you might use the ViewPort item in your xorg.conf:

SubSection "Display"
    Depth 24
    Modes "1280x1024" "1024x768"
    Virtual 400 200
or something similar. the 400 is the x-offset and the 200 is the y-offset. this specifies the upper-left corner of where xorg should paint your screen, relative to the absolute upper-left of the monitor, which may be off the physical screen, as your setup is using. Play with the numbers, I don't know how far off yours is. remember you can kill X with Ctrl+Alt+Backspace and return to the command prompt to fix things up. this adjustment would not affect your text-mode command line display since X is not the one rendering that.

never tried it myself but it might help you!
Old 08-28-2007, 11:03 PM   #6
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Originally Posted by Road_map View Post
Did you try without fb? (vga = normal in /etc/lilo.conf)
I tried this and same exact problem even with console running in vga mode.
Old 01-06-2008, 11:46 AM   #7
Registered: Aug 2004
Location: Argentina
Distribution: slackware 12
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hi QuePID,
I'm running on exactly same problem as you (off-center screen on slack 12 and a SiS video chipset - modeline values completely ignored)

were you able to fix it? I've tried different xorgcfg combinations with no luck at all.

I'll appreciate any hint on this issue.

thanks in advance


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