Re: kern/52440: nouveau blank screen w/some cards after MSI change in 7.99.64

["John D. Baker" <jdbaker%mylinuxisp.com@localhost>]

The following reply was made to PR kern/52440; it has been noted by GNATS.

From: "John D. Baker" <jdbaker%mylinuxisp.com@localhost>
To: gnats-bugs%NetBSD.org@localhost
Cc: coypu%sdf.org@localhost
Subject: Re: kern/52440: nouveau blank screen w/some cards after MSI change
 in 7.99.64
Date: Fri, 1 Sep 2017 09:55:28 -0500 (CDT)

 On Fri, 1 Sep 2017, coypu%sdf.org@localhost wrote:
 
 >  Looking at linux MSI docs, I see this sentence:
 >  
 >  Some host chipsets simply don't support MSIs properly.  If we're
 >  lucky, the manufacturer knows this and has indicated it in the ACPI
 >  FADT table.  In this case, Linux automatically disables MSIs.
 >  Some boards don't include this information in the table and so we have
 >  to detect them ourselves.  The complete list of these is found near the
 >  quirk_disable_all_msi() function in drivers/pci/quirks.c.dd
 >  
 >  I think we are not doing the ACPI FADT thing
 
 I went around to all the affected machines and gathered the equivalent data
 to the 'dmesg' excerpts and 'pcictl ... dump' under Linux ('lspci') and
 all the cards report using MSI under Linux.
 
 I am away from the machines until early next week.  I will gather ACPI-
 related data as soon as I can.
 
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