please add support of my x2300 mobility radeon (M64S) to radeonhd drivers. i succesfully modified utility rhd_conntest, and now it recognizes my card:

localhost conntest # ./rhd_conntest 1:0.0
rhd_conntest: version 0.0.2, built from git branch master, commit e9c24f66.. + changes
Checking connectors on 0x7188, 0x144D, 0xC515  (@01:00:00):
  Load Detection: RHD_OUTPUT_NONE
  HotPlug: RHD_HPD_NONE
  DDC: RHD_DDC_1 RHD_DDC_2
  LVDS Info:
        18bits, single link, LDI Panel found.
        Power Timing: 0xF9F, 0x012, 0x03, 0x19, 0x1F4
        Macro: 0x0B520407, Clock Pattern: 0x0063
  DDC Line[1]: Slaves: 10 12 14 16 18 1a 1c 1e 20 22 24 26 28 2a 2c 2e 30 32 34 36 38 3a 3c 3e 40 42 44 46 48 4a 4c 4e 50 52 54 56 58 5a 5c 5e 60 62 64 66 68 6a 6c 6e 70 72 74 76 78 7a 7c 7e 80 82 84 86 88 8a 8c 8e 90 92 94 96 98 9a 9c 9e a0 a2 a4 a6 a8 aa ac ae b0 b2 b4 b6 b8 ba bc be c0 c2 c4 c6 c8 ca cc ce d0 d2 d4 d6 d8 da dc de e0 e2 e4 e6 e8 ea ec ee

but my tries to modify drivers was not succesfull, and in xorg logs i still see only one error message "(EE) Device not found" (proprietary drivers 8.40.4 doesn't works too). below is some additional information about card:

localhost conntest # hwinfo --gfxcard
26: PCI 100.0: 0300 VGA compatible controller (VGA)
  [Created at pci.288]
  Unique ID: VCu0.i1U55UNewxA
  Parent ID: _Znp.IOaVMBVNBp3
  SysFS ID: /devices/pci0000:00/0000:00:02.0/0000:01:00.0
  SysFS BusID: 0000:01:00.0
  Hardware Class: graphics card
  Model: "Samsung Electronics VGA compatible controller"
  Vendor: pci 0x0001
  Device: pci 0x7188
  SubVendor: pci 0x144d "Samsung Electronics Co Ltd"
  SubDevice: pci 0xc515
  Memory Range: 0xd0000000-0xd7ffffff (rw,prefetchable)
  I/O Ports: 0x9000-0x9fff (rw)
  Memory Range: 0xd8000000-0xd800ffff (rw,non-prefetchable)
  Memory Range: 0xd8020000-0xd803ffff (ro,prefetchable,disabled)
  IRQ: 5 (no events)
  I/O Ports: 0x3c0-0x3df (rw)
  Module Alias: "pci:v00000001d00007188sv0000144Dsd0000C515bc03sc00i00"
  Config Status: cfg=new, avail=yes, need=no, active=unknown
  Attached to: #10 (PCI bridge)

Primary display adapter: #26

localhost conntest # lspci -vvv
01:00.0 VGA compatible controller: Unknown device 0001:7188 (prog-if 00 [VGA controller])
        Subsystem: Samsung Electronics Co Ltd Unknown device c515
        Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
        Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
        Latency: 0, Cache Line Size: 32 bytes
        Interrupt: pin A routed to IRQ 5
        Region 0: Memory at d0000000 (32-bit, prefetchable) [size=128M]
        Region 1: I/O ports at 9000 [size=256]
        Region 2: Memory at d8000000 (32-bit, non-prefetchable) [size=64K]
        [virtual] Expansion ROM at d8020000 [disabled] [size=128K]
        Capabilities: [50] Power Management version 2
                Flags: PMEClk- DSI- D1+ D2+ AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-)
                Status: D0 PME-Enable- DSel=0 DScale=0 PME-
        Capabilities: [58] Express (v1) Legacy Endpoint, MSI 00
                DevCap: MaxPayload 128 bytes, PhantFunc 0, Latency L0s <4us, L1 unlimited
                        ExtTag+ AttnBtn- AttnInd- PwrInd- RBE- FLReset-
                DevCtl: Report errors: Correctable- Non-Fatal- Fatal- Unsupported-
                        RlxdOrd+ ExtTag- PhantFunc- AuxPwr- NoSnoop+
                        MaxPayload 128 bytes, MaxReadReq 128 bytes
                DevSta: CorrErr- UncorrErr- FatalErr- UnsuppReq- AuxPwr- TransPend-
                LnkCap: Port #0, Speed 2.5GT/s, Width x16, ASPM L0s L1, Latency L0 <64ns, L1 <1us
                        ClockPM- Suprise- LLActRep- BwNot-
                LnkCtl: ASPM Disabled; RCB 64 bytes Disabled- Retrain- CommClk-
                        ExtSynch- ClockPM- AutWidDis- BWInt- AutBWInt-
                LnkSta: Speed 2.5GT/s, Width x16, TrErr- Train- SlotClk+ DLActive- BWMgmt- ABWMgmt-
        Capabilities: [80] Message Signalled Interrupts: Mask- 64bit+ Queue=0/0 Enable-
                Address: 0000000000000000  Data: 0000

PS: this videocard is installed in SAMSUNG NP-R25F000/SEK notebook.