Comment 60 for bug 444139

I don't know exactly how to determine video memory size, but I believe it is an old 64MB card as card ID is R9200SE/64B/64M.

lspci gives

~$ lspci -v -v
01:00.0 VGA compatible controller: ATI Technologies Inc RV280 [Radeon 9200 SE] (rev 01)
 Subsystem: Hightech Information System Ltd. Device 320e
 Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
 Status: Cap+ 66MHz+ UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
 Latency: 64 (2000ns min), Cache Line Size: 32 bytes
 Interrupt: pin A routed to IRQ 16
 Region 0: Memory at f4000000 (32-bit, prefetchable) [size=64M]
 Region 1: I/O ports at d800 [size=256]
 Region 2: Memory at eb800000 (32-bit, non-prefetchable) [size=64K]
 Expansion ROM at f3fe0000 [disabled] [size=128K]
 Capabilities: <access denied>

01:00.1 Display controller: ATI Technologies Inc RV280 [Radeon 9200 SE] (Secondary) (rev 01)
 Subsystem: Hightech Information System Ltd. Device 320f
 Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx-
 Status: Cap+ 66MHz+ UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
 Latency: 64 (2000ns min), Cache Line Size: 32 bytes
 Region 0: Memory at ec000000 (32-bit, prefetchable) [size=64M]
 Region 1: Memory at eb000000 (32-bit, non-prefetchable) [size=64K]

Just repeat my previous post:
Option "AGPSize" "8" => doesn't work (black screen with compiz)
Option "AGPSize" "16" or "32" => desktop image is back.

I didn't test another options as "BusType", "AccelMethod" or "MigrationHeuristic". Just let me know if it is needed.