Red Hat Bugzilla – Bug 110464
ATI Graphics Pro Turbo PCI Mach64 video card won't display > 256 colors in XFree86
Last modified: 2007-04-18 12:59:37 EDT
Description of problem:
When setting up XFree86 to work with an ATI Graphics Pro Turbo PCI
videio card equip with 4 MB of VRAM, XFree86 will detect the video
card and the 4 MB of VRAM but will refuse to display more than 256
(8-bit) colors in any resolution mode of the Graphics Pro Turbo PCI card.
Version-Release number of selected component (if applicable):
Configure XFree86 for the ATI Graphics Pro Turbo PCI card.
What ever happen to the XConfigurator utility program?
Steps to Reproduce:
XFree86 will detect the ATI Mach64 chipset and 4 MB of VRAM on the
Graphics Pro Turbo PCI card but will refuse to use more than 256
(8-bit) colors in any valid graphics resolution mode. This works fine
in RedHat Linux 7.2 and previous releases that I have used.
XFree86 should detect the ATI Graphics Pro Turbo PCI card with 4 MB of
VRAM and display more than 256 (8-bit) color, such as full 24-bit
color depending on the valid graphics resolution modes.
Created attachment 96066 [details]
XFree86.0.log file of the results from trying to display more than 256 colors.
Created attachment 96068 [details]
XF86Config file configured for the ATI Graphics Pro Turbo PCI Card
This XF86Config file is setup for an ATI Graphics Pro Turbo PCI card with the
extra 2 MB VRAM option added giving it a total of 4 MB VRAM. Also, I am using
an IBM P200 SVGA monitor, which the listed graphics resolution modes should be
valid with since they were working fine with RedHat Linux 7.2 XFree86.
This isn't a bug, but rather it is a misconfiguration. The X server
log file shows the following:
(**) ATI(0): Depth 16, (--) framebuffer bpp 16
(EE) ATI(0): Depth 16 is not supported through this adapter.
This declares that depth 16 is not supported by the video driver
for this particular adaptor. Looking through previous driver
releases in older XFree86 releases, this particular adaptor has
never had 16 bit depth support in XFree86 4.x. If you had this
card working in 16 bit depth in Red Hat Linux 7.2, then you almost
certainly must have been using one of the no longer supported
XFree86 3.3.6 X servers (we stopped shipping them in 8.0), or the
Here are a few workarounds/alternative solutions that may or may
not be useful:
- Try using the unsupported 'vesa' driver. If this works, it will
give unsupported unaccelerated 16bit depth perhaps.
- Try using kernel framebuffer driver, also unsupported. You can
use the Framebuffer-HOWTO for tips on how to set this up.
- If you're the adventurous-developer type, you might want to take
a stab at porting the 16 bit depth support in 3.3.6 (assuming it
supported 16bit on this card), and port it to CVS head ati driver,
then submit that to XFree86.org for inclusion in 4.5.0.
- Alternatively, you may wish to file a request for enhancement to
XFree86.org via http://bugs.xfree86.org bugzilla.
- Post a message to firstname.lastname@example.org user help forum, and perhaps
another user/developer may have other suggestions that are
Hope this helps.
Closing as 'NOTABUG'.