September 21st, 2002, 08:08 PM
Running X( Linux GUI) on your Display Card
Running X on your Display Card
What you can do when your display card or drivers don’t work properly?
So you’ve finally seen the light, and decided to install Linux on your PC. Everything installs just fine, but you’re stuck with an unsupported display card, or one for which the supplied drivers don’t work properly. Worse, you could be stuck with a SiS 6215 card.
This can cause a serious problem. For one, many ex-Windows users get withdrawal symptoms if they’re not able to click a button or play Solitaire or Minesweeper. But the real issue is that many of the better configuration and management tools available for Linux demand a Graphical User Interface (GUI).
Most display cards manufactured since 1996 support a display mode called FrameBuffer, accessed using standard BIOS calls using the VESA 2.0 standard. Even the infamous SiS cards support this mode.
Most recent Linux distributions include support for this mode of display, and ship with a FrameBuffer-aware X server. While the following technique applies to most Linux distributions, we’ll concentrate on Red Hat Linux 6.2. But this technique does comply with the variety of Linux distributions available .
VGA settings in LILO
256 colors 32k colors 64k colors 16M colors
640x480 768 784 785 786
800x600 771 787 788 789
1,024x768 773 790 791 792
1,280x1,024 775 793 794 795
I assume that you’ve installed Linux correctly, and that you didn’t manage to install X properly (otherwise you wouldn’t be reading this article). I also assume that you’re using the stock Linux kernel from the CD and have not recompiled one of your own (all RHL 6.2 kernels have VESA FrameBuffer support compiled in).
Please note that the entire procedure requires you to be logged in as root.
Step 1: Installing the software
Insert your Red Hat Linux 6.2 CD and mount it
Now install the required packages (some of these may already be installed, so ignore any error messages about this fact). Pay attention to capital and lower case letters.
rpm -ivh XFree86-VGA16*.rpm
rpm -ivh XFree86-FBDev*.rpm
rpm -ivh Xconfigurator*.rpm
rpm -ivh fbset*.rpm
Step 2: Testing compatibility
You need to make sure that our technique will work for you, so you need to find out whether your display card has a VESA 2.0 BIOS.
To do this, reboot the system. At the LILO prompt, type the following command:
LILO: linux 3 vga=xxx
where “xxx” is a number taken from the table above.
A safe value would be 771, which means a resolution of 800x600 and 256 colors—most monitors and display card combinations should support this. Try 773 only if you’re sure that your card has at least 2 MB RAM, and that your monitor can support a resolution of 1,024x768.
Don’t try any higher combinations for now, you can always change things later. After entering the command, for example “linux 3 vga=771”, hit Enter. What do you get? Did your screen blank out for a moment, and reappear with a little penguin in the top corner? Congratulations! You’re now in framebuffer mode, and the rest of this article should apply to you. By the way, even though you’re seeing text, you’re actually in graphics modes. So, text scrolling may be a bit slower than you’re used to, but as a compensation, you get more text on your screen.
If it didn’t work, then you either have a card with no VESA support or one that supports only VESA 1.2, or you aren’t using the default kernel shipped with Red Hat Linux 6.2. In either case, this technique won’t work for you.
If the screen blanks out or distorts, it probably means that your card supports the setting, but your monitor doesn’t. Hit Ctrl-Alt-Del and reboot the system (it might take a while, but is safe enough) and try a lower resolution.
However, assuming that it did work, we’ll move to the next step.
Step 3: Setting up LILO
Edit the file /etc/lilo.conf, and insert the following line before the first “image” statement:
where “xxx” is again the value you used while booting.
Save the file, and run the command
to update the LILO setup.
Reboot the system again to make sure it works—this time you should get the penguin without having to type any commands at the LILO prompt.
Step 4: Setting up your monitor
Now we come to the more complicated part, so pay close attention.
First of all, you need to run Xconfigurator
Xconfigurator --server VGA16
Note that there are two hyphens before “server”, and no spaces between them or between them and the word “server”. And VGA16 is in capital alphabets.
This will set up X to use the generic VGA driver in 16-color mode. Don’t worry, we aren’t going to leave it at that—the real objective here is to specify your monitor, we’ll change the X server presently.
Xconfigurator will now prompt you for the specifications of your monitor. If you can find the exact model you have, select that, otherwise use the Custom Monitor setting. Don’t attempt to use a “similar” model—it probably won’t work for you.
If you found your exact monitor model, ignore the next few paragraphs, and go to the paragraph that talks about probing.
If you used the Custom Monitor setting, you’ll be prompted for some parameters about your monitor. This is a good time to have your monitor manual at hand. The first parameter is the horizontal sync value applicable for your monitor. Most monitors can take Extended Super VGA 800x600, though you can choose the value that’s applicable to your monitor. Check your monitor manual for details.
Next you’ll be asked for the vertical sync range. Use the values closest to the ones in your manual.
Now Xconfigurator will ask you whether it can probe for screen resolution and color depth. Select “Don’t probe” here. Next, you’ll be asked for the amount of screen memory you have. Don’t lie—select the correct amount of video memory you have. If you aren’t sure, we suggest that you select 1 MB, which is the least any card ships with today.
When asked about Clockchip Configuration, select “No Clockchip Setting”.
Select “Skip” when asked whether you wish to run “X -probeonly”.
Next you’ll be asked whether to test your X configuration. Select “Skip” here, too.
Finally it will save the configuration.
Step 5: Setting up X
Next, we need to make a few changes in the X configuration file.
Here, we’ll first make a copy of the file XF86Config.
cp XF86Config XF86Config.backup
Now edit the file XF86Config using your favorite text editor.
Scroll down and locate the part of the file called
# Screen sections
Just below that, you should find a section that looks like this
# The Color SVGA server
Device “Generic VGA”
Monitor “My Monitor”
#Modes “640x480” “800x600” “1024x768” “1152x864”
ViewPort 0 0
You might find a difference in the “Monitor” setting—that’s okay. Duplicate this entire section, and change it so that it looks as follows:
# The FrameBuffer Device server
Device “Generic VGA”
#Device “My Video Card”
Monitor “My Monitor”
ViewPort 0 0
Notice that we’ve changed the driver name from “svga” to “fbdev”. We’ve commented out the “Depth” setting, and changed the Modes statement to “default”. The important thing is that the “Monitor” setting must not be changed.
Save the file.
Now we need to tell X to use the Framebuffer Device X server instead of the generic VGA16 server. Run the following commands:
rm -f /etc/X11/X
ln -sf /usr/X11R6/bin/XF86_FBDev /etc/X11/X
Time to test things out. Run the command
Yes, that’s a single, capital alphabet—X.
Did your screen blank out, then reappear with a hatched pattern on it, with an X-shaped mouse cursor in the center?
If so, congratulations! You have functional X. Now kill the X server (Ctrl-Alt-Backspace), run
and enjoy your functional X desktop. If it didn’t work, there could a couple of reasons for this.
The mode you selected for the VGA setting in the LILO configuration may not be supported by X. In many cases, we’ve found that you can only get 256 colors, and you may have specified a higher color setting. Try the lower settings. Like we said, 800x600 at 256 colors is a safe enough value to try.
Your monitor may not actually support the resolution you’ve selected—try a lower resolution.
You may have made a mistake following the steps given here. Start again from the beginning, and be very careful.
Remember, if the screen blanks out or distorts, you can kill the X server with a Ctrl-Alt-Backspace. This is a sign that your card can take the settings but that you’ve configured the monitor to a higher resolution than it can take.
If, despite everything, it doesn’t work, take heart from the fact that you’ve given it your best shot, and go and get yourself a display card that’s supported. Most Cirrus Logic, Matrox, Intel i740, Trio64, and other S3 cards will work just fine.
Hopefully, this article will put to rest the raging debate about supported video cards. There are very few cards that don’t support this technique, and if you ever run into a friend who has an unsupported card, elevate yourself to new levels of “Gurudom” by setting up X on his/her machine.
Best of luck!
Yash G. Acharya.
(Any queries on Linux or Windows operating systems are welcome at:
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September 21st, 2002, 08:40 PM
This forum is for original tutorials, not cut and paste jobs.
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