[Bug 97987] xf86-video-ati-7.7.1: "(EE) No devices detected.", ppc

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=97987

--- Comment #10 from erhard_f at mailbox.org ---
Finally sorted it out with your help from here. The main issue was "VGA
Arbitration" in the kernel-config, Device Drivers -> Graphics support. On my
config (PowerMac G5, AGP graphics card) I need to have CONFIG_VGA_ARB=y
enabled.

With CONFIG_VGA_ARB=y in combination with CONFIG_DRM_FBDEV_EMULATION=y and
CONFIG_FB_OF=y I get a working concole and working X with "radeon"-driver.
Other framebuffer drivers must not be selected in the kernel config.

With these options set correctly no xorg.conf is needed. The framebuffer
console switches from Open Firmware to the radeon driver and the output looks
like this:

# dmesg | grep -i rade
[    8.365707] [drm] radeon kernel modesetting enabled.
[    8.365765] fb: switching to radeondrmfb from OFfb ATY,Piton_
[    8.390327] fb: switching to radeondrmfb from OFfb ATY,Piton_
[    8.393385] radeon 0000:f0:10.0: enabling device (0006 -> 0007)
[    8.395828] radeon 0000:f0:10.0: Invalid PCI ROM header signature: expecting
0xaa55, got 0xffff
[    8.500921] radeon 0000:f0:10.0: VRAM: 256M 0x00000000A0000000 -
0x00000000AFFFFFFF (128M used)
[    8.500927] radeon 0000:f0:10.0: GTT: 512M 0x0000000080000000 -
0x000000009FFFFFFF
[    8.504153] [drm] radeon: 128M of VRAM memory ready
[    8.504157] [drm] radeon: 512M of GTT memory ready.
[    8.506559] [drm] radeon: 1 quad pipes, 1 Z pipes initialized.
[    8.506661] radeon 0000:f0:10.0: WB enabled
[    8.506670] radeon 0000:f0:10.0: fence driver on ring 0 use gpu addr
0x0000000080000000 and cpu addr 0xc00000026a6c7000
[    8.506754] [drm] radeon: irq initialized.
[    8.665381] [drm] radeon: ring at 0x0000000080001000
[    8.666957] [drm] Radeon Display Connectors
[    8.882890] radeon 0000:f0:10.0: fb0: radeondrmfb frame buffer device
[    8.886343] [drm] Initialized radeon 2.45.0 20080528 for 0000:f0:10.0 on
minor 0

# cat /proc/fb 
0 radeondrmfb

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