Problems using XFree86 (S3-server) in 16/32 bpp mode

Problems using XFree86 (S3-server) in 16/32 bpp mode

Post by Rainer Menzn » Wed, 26 Jun 1996 04:00:00


I have a Miro 12SD videocard (VLB) installed and I'm runnning XFree86
3.1.2 (S3-server). I upgraded my graphics card from 1 MByte to 2 MByte
video ram and wanted to start X in 16 bpp mode.

As far as I understand videotimings etc., the available color depth
does not depend on the mode line entries. In other words, a
Modeline that works properly in 8 bpp mode MUST also work properly in
16 bpp mode, provided that enough videoram is available.

But when I start the server (startx -- -bpp 16) using a Modeline that
works ok in 8 bpp mode, the screen starts to flicker and parts of
windows appear twice on the screen; in other words there's a screen
full of garbage. A solution seems to be the reduction of the
resolution from 1024x768 to 800x600 or to switch to an interlaced

Does anyone understand this?
Did I missunderstand or forget something or is this a bug in the S3

Thanx for any answers and comments,



*** ____ ******* . * . ******** Dipl.-Ing. Rainer Menzner *********************
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Problems using XFree86 (S3-server) in 16/32 bpp mode

Post by sie » Wed, 03 Jul 1996 04:00:00

There are a few bug fixes that are already done to the latest beta
versions of several xservers that fixes the flickering problem in 16,
32 modes. These betas have a expiration date.  So you might want to wait
for the final version of your xserver to come out.
Check out to see if your prob. happens to be one
of the bug fixes.


1. XF86config 3.1 BUG + problems: 16 bpp and 32 bpp color mode for Kelvin 64 (clgd5434):HELP

After trowing away Yggdrasil's fall '94 distribution, i've installed
slackware's 2.1 linux. This solved quite some problem's described already
under Yggdrasil fall '94 mails. I managed to get my Orchid Kelvin 2Mb, PCI
to work under Depth 8, but :
- moving windows creates dust/snow
- at startup (startx) my desktop is partially blue, rest is the standard grey
desktop ?? only after opening a window (wterm of Xfilemngr ..) + Refresh Sreen
i get a complete blue desktop
- exiting Xwindow once is ok, but if I exit it again , my text terminal is
messed up that badly that i can only reboot the system
- following instruction under usr/X11/lib/X11/doc in the README.cirrus doc
for running 16 or 32 bit color does or not work or again send my xterm into a
complete mess so i have to reboot.

Any hints ???
Maybe another bug:
- after restarting Xwindows again: the middle click pop-up window : no item
from that window can be selected because the whole window move down,
instead of only the cursor ?!?!! I can only select something by keep mouse
still, and using the arrows to move up/down in the pop-up !!!!

Anyone similar experience ? Solved or not. Anyone more succes in getting more
than 8-bit color ??? Yes ? How with the clgd5434.
ps where do you find PCIDUMP.exe so i can try to set a membase option-line.
my options specified in XConfig: option 2048, option "linear".

Any suggestions/help are welcomed to be mailed directly to me.
I will post any succesful hints back.

Johan Van den Wyngaert

2. Compiling MH on linux

3. How to use -bpp 16 -bpp 24 -bpp 32 when using XDM?

4. alpha optimization

5. XFree86 3.1.1, Mach 64 and 16/32 bpp modes

6. NFS performance ...

7. XF86_S3 + S3 Trio 32 1Mb + 15/16 bpp = Trouble, Help

8. recursive listing skipping specific directories

9. Problems with S3-868 in 16,32 bit mode

10. Only one visual in 16 bpp S3 server mode?

11. Millenium II (PCI) OK @ 8,16,32 bpp, *not* OK @ 24 bpp ?

12. Difference between 8bpp | 16 bpp | 32 bpp?

13. 3.1.2b MACH64 -- start X in 16 or 32 bpp problem