The 10.5.2 DVD doesn't install ATINDRV.kext. I uploaded the modified kexts from the Leopard Graphics Update, had to use rapidshare 'cuase of the 1 KB limit for attachments. Here's the link:

http://rapidshare.com/files/99307216/ATI_X1600_Leopard_GraphicsUpdate.dmg.html

Copy the files from the .dmg in /System/Library/Extensions, open Terminal and enter the following commands (you can also use copy/paste):

sudo -s (password)

chmod -R 755 /System/Library/Extensions && chown -R root:wheel /System/Library/Extensions

diskutil repairpermissions /

After this delete /System/Library/Extensions.mkext and reboot.

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2 Opteron systems: OSx86 10.5.8, Andy's 9.8.0 kernel, Asus A8N-SLI Premium, Opteron 185 o'clocked @ 2 x 2,95 GHz (2nd system 2.6 GHz), ATI Radeon HD2600XT 256MB Dual-Monitor 2x HP L2035, 4 GB RAM, Griffin FireWave as main audio device, Marvell + nForce LAN, Asus U3S6 USB3/SATA6 card, 5,5 TB harddisk, Firewire 800 card, Apple Remote + eHome IR receiver, 2x Wacom serial graphics tablet, Canon Pixma iP4700, Logitech Internet Navigator wireless keyboard/mouse combination.

My Audio stuff: M-Audio Transit USB (default audio), M-Audio ProFire 610, M-Audio ProFire Lightbridge (34 channels) using Creamware A16 ADAT converter • MIDI: M-Audio Midiman 4x MIDI interface • Behringer Audio Mixers: Xenyx 1002, Xenyx 1002FX, Xenyx 1202FX, Eurorack UB1002FX, Eurorack MX1804FX, Eurorack MX262A • FX devices: Lexicon MPX100 DSP, Behringer DSP-1000 Virtualizer, Behringer MiniFEX 800 DSP, Behringer Multicom Pro MDX4400 compressor • RETRO: MSSIAH midi/sequencer/synthesizer cardridge for the C64 (Dual-SID), Steinberg M.S.I. MIDI Interface for C64