ubuntu-x-swat team mailing list archive

[Thomas Ribbrock <emgaron+ubuntu@xxxxxxxxxxxx>]

Public bug reported:

Binary package hint: xserver-xorg-video-fbdev

Ubuntu 9.04PPC "out-of-the-box" fresh install on an iMac DV 400MHz (G3,
slot-loader):

After the install, xorg.conf stays empty. Hence, X tries to figure out
the correct settings and driver automatically. On my iMac, X fails to
detect the built-in ATI Rage 128 card (see
https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-
video-r128/+bug/400864 ) and subsequently tries to use the fbdev driver.
When doing so, X does start, however, only 256 colours are used (8bit
PseudoColor mode). I tried to investigate the cause for this and tried
several things:

1) Create a minimal xorg.conf (the attached version contains some
commented out lines from experimenting) with "DefaultDepth 24" in the
Screen section. This results in an error message "FBIOPUT_VSCREENINFO
succeeded but modified mode" (see attached Xorg.0.log).

2) I tried the same thing using "DefaultFbBpp 32" instead of
"DefaultDepth 24". The result was the same.

3) I noticed in the log file that apparently the modes are checked
against the fbdev set-up. The default frame-buffer set-up as listed by
"fbset -i -v" is attached as well. It can be seen from this output and
Xorg.0.log that the frame buffer seems to have 8bit only and only some
600KB of video memory. Hence, I tried modifying these settings with
fbset - to no avail. I also tried adding a "VideoRam" statement to
xorg.conf - also to no avail. I was not able to change any settings.

In the end, I am still not able to run anything but 8bit graphics using
the fbdev driver. My impression is that this is due to the frame buffer
being in the wrong mode itself, but this seemingly cannot be changed
easily.

The same hardware works fine with 24bit under 8.04, using the r128
driver.

** Affects: xserver-xorg-video-fbdev (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: apple ati fbdev imac ppc rage xorg

-- 
9.04 PPC: fbdev wrongly configured in X
https://bugs.launchpad.net/bugs/400875
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