From cchtml.com

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Old Radeon Legacy (Open Source)

These cards are no longer actively supported by AMD as of the 8.28.8 fglrx driver. Unless you run an ancient distro, using the open source drivers is your only option.

* R100        Radeon 7200
* RV100       Radeon 7000(VE), M6, RN50/ES1000
* RS100       Radeon IGP320(M)
* RV200       Radeon 7500, M7, FireGL 7800
* RS200       Radeon IGP330(M)/IGP340(M)
* RS250       Radeon Mobility 7000 IGP
* R200        Radeon 8500, 9100, FireGL 8800/8700
* RV250       Radeon 9000PRO/9000, M9
* RV280       Radeon 9200PRO/9200/9200SE/9250, M9+
* RS300       Radeon 9100 IGP
* RS350       Radeon 9200 IGP

Radeon (Catalyst Legacy & Open Source)

ATI/AMD dropped Catalyst support for these cards in Catalyst 9-4. These cards are supported with the legacy ATI 9-3 Catalyst release, but you MUST use a kernel 2.6.28 (or earlier) and Xserver 1.5 (or earlier). For example, you can use Catalyst 9-3 if you're running Ubuntu 8.04 or Debian Lenny/5.0. Open source support is good and 3D is still improving.

* RS400/RS480 Radeon XPRESS 200(M)/1100 IGP
* R300        Radeon 9700PRO/9700/9500PRO/9500/9600TX, FireGL X1/Z1
* R350        Radeon 9800PRO/9800SE/9800, FireGL X2
* R360        Radeon 9800XT
* RV350       Radeon 9600PRO/9600SE/9600/9550, M10/M11, FireGL T2
* RV360       Radeon 9600XT
* RV370       Radeon X300, M22
* RV380       Radeon X600, M24
* RV410       Radeon X700, M26 PCIE
* R420        Radeon X800 AGP
* R423/R430   Radeon X800, M28 PCIE
* R480/R481   Radeon X850 PCIE/AGP
* RS482       Radeon (Xpress) 200
* RV505       Radeon X1300, M52, M62
* RV515       Radeon X1400, M54, M64
* RV516       Radeon X1500
* RV550       Radeon X2300
* R520        Radeon X1800, M58
* RV530/RV560 Radeon X1600/X1650/X1700, M56, M66
* RV570/R580  Radeon X1900/X1950, M68
* RS600/RS690 Radeon (Xpress) X1200/X1250/X1270
* RS740       Radeon X2100
* FireGL T2 (4154)
* FireGL V3100 (5B64)
* FireGL V3200 (3E54)
* FireGL V3300 (5E49)
* FireGL V5000 (5E48)
* FireGL V5100 (5551)
* FireGL V7100 (5550)
* FireGL X1 (4E47)
* FireGL X2-256/X2-256t (4E4B)
* FireGL X3-256 (4A4D)
* FireGL Z1 (4147)