kernel-packages team mailing list archive

[David Henningsson <1212160@xxxxxxxxxxxxxxxxxx>]

Hi,

This is a real oldie, but better late than never.

A while back, I discovered that this patch would help against a kernel
panic when "cat /proc/asound/card0/codec0" was executed on this machine,
which was running an fglrx driver.

I asked for a stable backport, but Takashi wanted testing to make sure
this was actually fixed by the patch [1]. And now, several months later,
I have this confirmation [2].

The test was conducted on an 3.5 Ubuntu kernel, based on the 3.5
extended stable tree, but would apply equally well to 3.4.

I'm attaching the backported patch - it applied cleanly, I've just added
an extra section with an explanation.

-- 
David Henningsson, Canonical Ltd.
https://launchpad.net/~diwic

[1]
http://mailman.alsa-project.org/pipermail/alsa-devel/2013-March/060132.html

[2]
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1212160/comments/4


** Patch added: "0001-ALSA-hda-Move-one-time-init-codes-from-generic_hdmi_.patch"
   https://bugs.launchpad.net/bugs/1212160/+attachment/3906367/+files/0001-ALSA-hda-Move-one-time-init-codes-from-generic_hdmi_.patch

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https://bugs.launchpad.net/bugs/1212160

Title:
   'cat /proc/asound/card0/codec0' cause kernel panic (battery mode)

Status in HWE Next Project:
  Triaged
Status in “linux” package in Ubuntu:
  Confirmed

Bug description:
  Kernel panic if;
  1. boot up system with battery mode (no AC connected)
  2. insert HDMI cable
  3. execute 'cat /proc/asound/card0/codec0'

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