Re: [REGRESSION][BISECTED] HDA controller MMIO unreadable on Intel 5-series PCH (Ibex Peak) since v6.16

On Sun, May 31, 2026 at 07:49:59PM +0000, Filippe Duke wrote:
> 00:1b.0 Audio device: Intel Corporation 5 Series/3400 Series Chipset High Definition Audio (rev 05) (prog-if 00 [HDA compatible])
> 	Subsystem: Acer Incorporated [ALI] Device 0357
> 	Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+
> 	Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
> 	Latency: 0
> 	Interrupts: pin B disabled, MSI(X) routed to IRQ 34
> 	Region 0: Memory at cc100000 (64-bit, non-prefetchable) [size=16K]
> 	Capabilities: [50] Power Management version 2
> 		Flags: PMEClk- DSI- D1- D2- AuxCurrent=55mA PME(D0+,D1-,D2-,D3hot+,D3cold+)
> 		Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-
> 	Capabilities: [60] MSI: Enable+ Count=1/1 Maskable- 64bit+
> 		Address: 0000000000000000  Data: 0000

MSI is enabled but address is zeroed.  Please provide "sudo lspci -vvv"
output of a working kernel so that we can see whether there's no MSI
address configured there either.

Thanks,

Lukas