The R200 series of Radeon graphics cards is supported by the Amiga operating system, Release 4 and higher. 2D graphics are fully supported by all cards in the family, with 3D acceleration support for the 9000, 9200, and 9250-series of cards.
Radeon 9200 Pro Family Drivers For Mac
Update 1/2/18:Based on what I have found, the issue occurs because of something called kernel mode set (KMS). The default, open source radeon driver needs KMS, so it gets disabled when I use nomodeset. Unfortunately, it seems like the new proprietary drivers (fglrx) don't support the old graphics card. I believe my best course of action would be to install the legacy proprietary drivers, but I haven't found a way to do so. If you have any ideas on how to do this, please let me know.
This page is only for free Radeon drivers using KMS. radeon (xf86-video-ati) for 2D; radeon, r200 Mesa and r300, r600, radeonsi Gallium drivers only. THIS PAGE IS NOT FOR FGLRX/CATALYST DRIVERS PROVIDED BY AMD/ATI.
Try modinfo -p radeon to find up-to-date parameters. To check default values look at drivers/gpu/drm/radeon/radeon_drv.c or drivers/gpu/drm/amd/amdgpu/amdgpu_drv.c in Linux kernel source. To check current values look at /sys/class/drm/card*/device/driver/module/holders/radeon/parameters/ or /sys/class/drm/card/device/driver/module/holders/amdgpu/parameters/*
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