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From: kernel@linuxace.com
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Subject: RE: [PATCH 07/14] drm/mgag200: Replace simple-KMS with regular atomic
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Date: Tue, 25 Apr 2023 16:39:52 -0700
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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