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

["John D. Baker" <jdbaker%consolidated.net@localhost>]

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

From: "John D. Baker" <jdbaker%consolidated.net@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: Tue, 11 Feb 2020 19:56:47 -0600 (CST)

 Booting the Toshiba Qosmio F15R laptop with i386-9.99.46 GENERIC (which
 is after the MSI revert [back to INTx]) panics much the same as with
 9.0_RC2 and the MSI-enabled 9.99.45 w/patch from Jared:
 
 [...]
 kern.module.path=/stand/i386/9.99.46/modules
 nouveau0: info: NVIDIA NV43 (043800a4)
 nouveau0: info: bios: version 05.43.02.49.bc
 nouveau0: info: fb: 128 MiB DDR1
 uvm_fault(0xc146c580, 0xda269000, 2) -> e
 fatal page fault in supervisor mode
 trap type 6 code 0x3 eip 0xc0dcf8bc cs 0x8 eflags 0x10206 cr2 0xda269000 ilevel 0 esp 0x8000
 curlwp 0xc2ed1b80 pid 0 lid 55 lowest kstack 0xdb2f82c0
 kernel: supervisor trap page fault, code=0
 Stopped in pid 0.55 (system) at netbsd:memset+0x2c:      repe stosl      %es:(%edi)
 db{0}>
 
 
 The other NVidia-equipped machines at my disposal to test are amd64 and
 once again work fine with MSI reverted.  (All except the HP Pavilion
 dv2000 laptop, but it's got other problems besides an unsupported NVidia
 card.)
 
 I have a test kernel which rolls back the "linux_pci.c" file to enable
 MSI and that works fine on these amd64 test systems since MSI is explicitly
 disabled for nouveau.  The intel- and radeon-equipped machines I've tested
 with this kernel report MSI enabled on the graphics device.
 
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