Hard crash with new snd_hda.

[Adam McDougall]

On Mon, Oct 13, 2008 at 12:50:12AM +0300, Alexander Motin wrote:

  Adam McDougall wrote:
  > Alexander Motin wrote:
  >> Frank Mayhar wrote:
  >>> Fatal trap 12: page fault while in kernel mode
  >>> cpuid = 1; apic id = 01
  >>> fault virtual address   = 0x14
  >>> fault code              = supervisor read, page not present
  >>
  > I think I am having a similar issue, discovered it on a new model Dell 
  > Latitude E6500.  It is probably seeing a codec for HDMI and modem in 
  > addition to the normal sound. Sound works if I patch the old hda driver 
  > to detect my codec on 7.1, but I just got 8 installed last night.  If I 
  > have KDB_UNATTENDED and a dumpdev, it either hangs at the beginning of 
  > the dump or reboots almost immediately after the panic.  I can try to 
  > hook up a serial or firewire console later and gather more info, but 
  > tonight I might be too busy.  In the meantime, here are two screenshots 
  > of the panic and the backtrace:
  > http://www.egr.msu.edu/~mcdouga9/pics/1007081830.jpg
  > http://www.egr.msu.edu/~mcdouga9/pics/1007081831.jpg
  
  I have managed to artificially reproduce your situation and I think my 
  recent patch just committed to 8-CURRENT should fix the problem. Report 
  me the results please.
  
  -- 
  Alexander Motin

Thanks, I tried it and it works!  I didn't have to patch codec
information into the driver to make my laptop speakers work,
and they were selected by default (lucky for me).  I did not
test headphones yet, but I will later.  I plan on 
comparing the old hda driver with the new one and see what 
patches would be appropriate to submit to clean up some of
the "Unknown"s when I have a chance.  

hdac0: <HDA Codec #0: Unknown Codec>
hdac0: <HDA Codec #1: Conexant (Unknown)>
hdac0: <HDA Codec #2: Unknown Codec>
pcm0: <HDA codec #0 Unknown Codec PCM #0> on hdac0
pcm1: <HDA codec #0 Unknown Codec PCM #1> on hdac0
pcm2: <HDA codec #2 Unknown Codec PCM #0> on hdac0