Bug#613747: kernel oops observed on 5 machines

["Cook, Jesse" <jcook@camber.com>]

I've observed frequent but inconsistent kernel oops on boot and shutdown of Debian Squeeze on 5 of 7 tested HP Compaq dc7800 machines.

Running 'lspci | grep VGA' yields:
  
  01:00.0 VGA compatible controller: ATI Technologies Inc RV530 [Radeon X1600]

Running 'lsmod | grep radeon' yields:

  radeon                574844  2 
  ttm                    40146  1 radeon
  drm_kms_helper         20369  1 radeon
  drm                   142327  4 radeon,ttm,drm_kms_helper
  i2c_algo_bit            4225  1 radeon
  i2c_core               15819  4 radeon,drm_kms_helper,drm,i2c_algo_bit

Adding 'blacklist radeon' to '/etc/modprobe.d/blacklist.conf' changes the output of lsmod upon reboot for radeon from:

    radeon                574844  2 

to:

    radeon                574844  1

A custom minimal install of Debian without X yielded:

      radeon                574844  0

In the last two cases (system with 'blacklist radeon' added and system with minimal install without X), I have been unable to reproduce a kernel oops testing on multiple machines across many reboots.

Gnome still works with the addition of the blacklist. However, I have observed tty switching issues (i.e. if I switch to tty1 then back to tty7 then try to go back to another tty I can only get tty7 to come up).

--
Jesse