Re: rc6 keeps hanging and blanking displays

[Helge Hafting <helge.hafting@aitel.hist.no>]

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