i only tried with armagetronad as game and it crashed.with 8.6 drivers it only returns to desktop and when it's icon on taskbar clicked it returns to game again and continue where it was before.2 second crash i think it reboots the gp card or something like that.but with 8.7 when it crashes,the screen becomes a garbage like the picture others posted above(lcd).
i tried lots of aperture sizes.i don't know it's an issue really about just that.in windows the best working ,and only working drivers i've found till now is 8.6 drivers from sapphire site(hotfix).it gives pretty much good fps.i can play most games(counter strike,armagetronad,prince the two thrones,double agent,vs ...) without crash and problem.but when i installed the newly released 8.7 it crashed again(reboot the machine).
8.6 works so good in spite of the aperture size set to 64M.i live no problem.(i don't like giving more aperture.my ram is total 1GB).
this is the output of cat Xorg.0.log|grep -i agp :
(--) fglrx(0): Chipset: "ATI Radeon HD 2600 Pro AGP" (Chipset = 0x9587)
(II) fglrx(0): AGP card detected
(II) fglrx(0): [pci] find AGP GART
(II) fglrx(0): [agp] Mode=0x1f004219 bridge: 0x10de/0x01e0
(II) fglrx(0): [agp] AGP v1/2 disable mask 0x00000000
(II) fglrx(0): [agp] AGP v3 disable mask 0x00000000
(II) fglrx(0): [agp] enabling AGP with mode=0x1f004319
(II) fglrx(0): [agp] Remapping MC AGP space (new MCAGPBase = 0x3690987520)
(II) fglrx(0): [agp] AGP protocol is enabled for graphics board. (cmd=0x1f004311)
(II) fglrx(0): [agp] graphics chipset has AGP v3.0 (native mode)