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: 
Subject: Re: kern/52440: nouveau blank screen w/some cards after MSI change
 in 7.99.64
Date: Wed, 2 Aug 2017 10:46:19 -0500 (CDT)

 Some things that I noticed immediately in comparing the output of the
 cards that don't like MSI and the one that does:
 
 In the MSI case, all cards report:
 
   nouveau0: interrupting at msi0 vec 0 (nouveau)
 
 in the 'dmesg' output.  In a thread started here:
 
   http://mail-index.netbsd.org/netbsd-users/2017/08/01/msg020023.html
 
 there was some suggestion that this was an indication of the problem.
 Since the working card prints the same message as the non-working cards,
 there is some doubt about this.
 
 
 In the INTx case, the card that works with MSI reports:
 
   LN0A: Picked IRQ 17 with weight 0
 
 in the 'dmesg' output and the "Interrupt Line" information agrees (0x11).
 
 The cards that don't work with MSI do not make any such report in 'dmesg'
 when using INTx.  The two cards available to me show Interupt Line 11
 (0x0b) while the one in the ThinkPad T61p reports Interrupt Line 10
 (0x0a).
 
 
 In case it's significant, all the non-working cards are on PCIbus 1 of
 their respective machines while the one working card is on PCIbus 2 of
 its machine.
 
 -- 
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