Re: How come that in kernel 2.6.11 a dvd is readable, but not in kernel 2.6.12?

[Francois Romieu <romieu@fr.zoreil.com>]

apache <apache@ayni.com> :
[...]
> Fact: I can write a DVD on a machine with kernel-2.6.11, but I cannot 
> read that DVD in a machine with kernel-2.6.12, even worse: the system is 
> stuck.
> 
> please explain

I can't explain but we may try to fix it with your help.

As a general remark, dmesg + .config + lspci -vx/lsmod help figuring the
hardware environment.

1 - can the regression be reproduced with last -rc (namely 2.6.13-rc4) ?
2 - if yes, can you isolate a simple operation to trigger the bug: I assume
    you read the DVD from hell with some nice viewer under X. Can you
    reproduce the bug in a simple console, without X, through a 'dd'
    command for instance ?
3 - if so, did you notice extra messages ? Is led activity available ?
4 - if you are still stuck, you can start a binary search on the 2.6.12-rc
    kernels, then on the 2.6.12-rcX-gitY to isolate the trigger (it may not
    necessarily be the culprit).

--
Ueimor