I'm not sure if this information is useful, but we have found one system which works with the 6.1 kernel. I grabbed the lspci output from a working and non-working system, pasted below. Same kernel and same distro. BAD Dell R815 AMD 0a:03.0 VGA compatible controller: Matrox Electronics Systems Ltd. MGA G200eW WPCM450 (rev 0a) (prog-if 00 [VGA controller]) DeviceName: Embedded Video Subsystem: Dell Device 0444 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: 32 (4000ns min, 8000ns max), Cache Line Size: 64 bytes Interrupt: pin A routed to IRQ 5 NUMA node: 0 IOMMU group: 10 Region 0: Memory at ec800000 (32-bit, prefetchable) [size=8M] Region 1: Memory at ef7fc000 (32-bit, non-prefetchable) [size=16K] Region 2: Memory at ee800000 (32-bit, non-prefetchable) [size=8M] Expansion ROM at 000c0000 [virtual] [disabled] [size=128K] Capabilities: [dc] Power Management version 1 Flags: PMEClk- DSI+ D1- D2- AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-) Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME- 00: 2b 10 32 05 07 00 90 02 0a 00 00 03 10 20 00 00 10: 08 00 80 ec 00 c0 7f ef 00 00 80 ee 00 00 00 00 20: 00 00 00 00 00 00 00 00 00 00 00 00 28 10 44 04 30: 00 00 00 00 dc 00 00 00 00 00 00 00 05 01 10 20 GOOD Dell R710 INTEL 0a:03.0 VGA compatible controller: Matrox Electronics Systems Ltd. MGA G200eW WPCM450 (rev 0a) (prog-if 00 [VGA controller]) DeviceName: Embedded Video Subsystem: Dell PowerEdge R710 MGA G200eW WPCM450 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: 32 (4000ns min, 8000ns max), Cache Line Size: 64 bytes Interrupt: pin A routed to IRQ 10 Region 0: Memory at d5000000 (32-bit, prefetchable) [size=8M] Region 1: Memory at deffc000 (32-bit, non-prefetchable) [size=16K] Region 2: Memory at df000000 (32-bit, non-prefetchable) [size=8M] Expansion ROM at 000c0000 [virtual] [disabled] [size=128K] Capabilities: [dc] Power Management version 1 Flags: PMEClk- DSI+ D1- D2- AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-) Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME- 00: 2b 10 32 05 07 00 90 02 0a 00 00 03 10 20 00 00 10: 08 00 00 d5 00 c0 ff de 00 00 00 df 00 00 00 00 20: 00 00 00 00 00 00 00 00 00 00 00 00 28 10 35 02 30: 00 00 00 00 dc 00 00 00 00 00 00 00 0a 01 10 20 Phil