Bug#683796: xserver-xorg-video-radeon: No 3D acceleration in iBook2 powerpc
--- On Wed, 8/8/12, Michel Dänzer <daenzer@debian.org> wrote:
> >
> > I heard that this handover from OFfb to radeon KMS can
> cause problems in
> > some cases. Maybe you can try adding video=offb:off to
> > video=radeonfb:off .
>
> BTW, does the black screen occur only when X starts, or
> already when KMS
> takes over from OFfb, which according to the above happens
> about 10
> seconds after the kernel starts booting?
The black screen happens about 10 seconds after boot starts when the line appears onscreen:
fb: conflicting fb...(it didn't give me time to read the rest, but I assume it's "fb: conflicting fb hw usage radeondrmfb vs OFfb ATY,Fall_A - removing generic driver").
Just to be clear about the symptoms, the screen is still lit, it's just colored black and there's nothing visible. Then when X starts in the boot process, the screen goes dark for a second as if it's powered off, then comes on again to a lit but black screen, then after another second switches to a slightly lower brightness level. When I switch to a console, something similar happens. Also, I can change the brightness of the black screen with the iBook's brightness keys.
I added video=offb:off to video=radeonfb:off like you suggested but got the same result. I also added video=1024x768-24@60, but that made no difference either.
In better news, I was able to work blindly and bring up an xterm window and typed "glxinfo | grep render > ~/glxinfo.txt" and then boot with no yaboot parameters to get back into a GUI, where the content of glxinfo.txt was:
direct rendering: Yes
OpenGL renderer string: Mesa DRI R100 (RV100 4C59) PowerPC NO-TCL DRI2
So there's that:)
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