Re: rc6 keeps hanging and blanking displays

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Linus Torvalds wrote:


On Mon, 22 Aug 2005, Linus Torvalds wrote:
But disabling the ROM assignment might be a good idea. Almost nobody ever really wants to assign the ROM anyway, and there are cards where there are some strange rules about ROM alignment (read: doesn't follow spec). 

Here's an even better idea.
Let's do the assignment internally in the kernel, but just not write it to the device unless it's actually enabled. IOW, we'll be doing all the resource allocation, but devices won't be affected. Modern lspci versions will show this as a "[virtual] Expansion ROM".
The patch might look something like this. Helge, does this make any difference? 
Tried it.  (More risky than it sounds, I am at work, the machine is at home,
and if it didn't come up again I'd get an angry phonecall . . .)

But it came up fine, and the xservers came up too. :-)

lspci -vvx shows the disabled ROMs too:
0000:01:00.0 VGA compatible controller: Matrox Graphics, Inc. MGA G550 AGP (rev 01) (prog-if 00 [VGA]) 
       Subsystem: Matrox Graphics, Inc. Millennium G550 Dual Head DDR 32Mb
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- Latency: 32 (4000ns min, 8000ns max), Cache Line Size: 0x08 (32 bytes) 
       Interrupt: pin A routed to IRQ 16
       Region 0: Memory at f0000000 (32-bit, prefetchable) [size=32M]
       Region 1: Memory at f2000000 (32-bit, non-prefetchable) [size=16K]
       Region 2: Memory at f3000000 (32-bit, non-prefetchable) [size=8M]
       Expansion ROM at f2020000 [disabled] [size=128K]
       Capabilities: [dc] 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: [f0] AGP version 2.0
Status: RQ=32 Iso- ArqSz=0 Cal=0 SBA+ ITACoh- GART64- HTrans- 64bit- FW- AGP3- Rate=x1,x2,x4 Command: RQ=32 ArqSz=0 Cal=0 SBA+ AGP+ GART64- 64bit- FW- Rate=x1 
00: 2b 10 27 25 07 00 90 02 01 00 00 03 08 20 00 00
10: 08 00 00 f0 00 00 00 f2 00 00 00 f3 00 00 00 00
20: 00 00 00 00 00 00 00 00 00 00 00 00 2b 10 84 0f
30: 00 00 00 00 dc 00 00 00 00 00 00 00 0b 01 10 20
0000:00:08.0 VGA compatible controller: ATI Technologies Inc RV280 [Radeon 9200 SE] (rev 01) (prog-if 00 [VGA]) 
       Subsystem: PC Partner Limited: Unknown device 7c25
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- 
       Latency: 32 (2000ns min), Cache Line Size: 0x08 (32 bytes)
       Interrupt: pin A routed to IRQ 19
       Region 0: Memory at e0000000 (32-bit, prefetchable) [size=128M]
       Region 1: I/O ports at 9800 [size=256]
       Region 2: Memory at f6000000 (32-bit, non-prefetchable) [size=64K]
       Expansion ROM at 1ff00000 [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-
00: 02 10 64 59 07 00 90 02 01 00 00 03 08 20 80 00
10: 08 00 00 e0 01 98 00 00 00 00 00 f6 00 00 00 00
20: 00 00 00 00 00 00 00 00 00 00 00 00 4b 17 25 7c
30: 00 00 00 00 50 00 00 00 00 00 00 00 05 01 08 00
0000:00:08.1 Display controller: ATI Technologies Inc RV280 [Radeon 9200 SE] (Secondary) (rev 01) 
       Subsystem: PC Partner Limited: Unknown device 7c24
Control: I/O- Mem- BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- Region 0: Memory at e8000000 (32-bit, prefetchable) [disabled] [size=128M] Region 1: Memory at f6010000 (32-bit, non-prefetchable) [disabled] [size=64K] 
       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-
00: 02 10 44 5d 00 00 90 02 01 00 80 03 08 20 00 00
10: 08 00 00 e8 00 00 01 f6 00 00 00 00 00 00 00 00
20: 00 00 00 00 00 00 00 00 00 00 00 00 4b 17 24 7c
30: 00 00 00 00 50 00 00 00 00 00 00 00 ff 00 08 00

Helge Hafting
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