Bug#683796: xserver-xorg-video-radeon: No 3D acceleration in iBook2 powerpc

[Michel Dänzer]

On Mit, 2012-08-08 at 05:00 -0700, Dan DeVoto wrote: 
> 
> Below is dmesg output with video=radeonfb:off in the kernel command line:
[...] 
> Aug  8 04:05:15 icebook kernel: [   10.769815] checking generic (9c008000 c0000) vs hw (98000000 8000000)
> Aug  8 04:05:15 icebook kernel: [   10.769832] fb: conflicting fb hw usage radeondrmfb vs OFfb ATY,Fall_A - removing generic driver
> Aug  8 04:05:15 icebook kernel: [   10.779698] Console: switching to colour dummy device 80x25
> Aug  8 04:05:15 icebook kernel: [   10.782214] checking generic (98808000 5a000) vs hw (98000000 8000000)
> Aug  8 04:05:15 icebook kernel: [   10.782235] fb: conflicting fb hw usage radeondrmfb vs OFfb ATY,Fall_B - removing generic driver

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 .


> Aug  8 04:08:01 icebook kernel: [  192.105636] [drm:drm_calc_timestamping_constants] *ERROR* crtc 10: Can't calculate constants, dotclock = 0!

Otherwise this is the only other sign of any potential problem that I
can see, though I think it shouldn't cause a black screen.


Maybe you can also check what /sys/class/backlight/radeon_bl/brightness
contains when the screen is black and whether writing 128 or other
values between 0 and 255 to it makes a difference.


-- 
Earthling Michel Dänzer           |                   http://www.amd.com
Libre software enthusiast         |          Debian, X and DRI developer