[alsa-devel] [RFC PATCH] ALSA: hda - Keep power link on for PantherPoint HDMI
tiwai at suse.de
Mon Nov 19 15:16:53 CET 2012
At Mon, 19 Nov 2012 15:14:45 +0100,
David Henningsson wrote:
> On 11/07/2012 09:36 AM, Takashi Iwai wrote:
> > At Wed, 7 Nov 2012 09:22:33 +0100,
> > David Henningsson wrote:
> >> On some of the PantherPoint HDMI machines we currently enable, we're seeing
> >> trouble with unsol events, i e detecting monitor presence, especially when
> >> on battery and after suspend/resume.
> >> BugLink: https://bugs.launchpad.net/bugs/1075882
> >> Tested-by: Cyrus Lien <cyrus.lien at canonical.com>
> >> Signed-off-by: David Henningsson <david.henningsson at canonical.com>
> >> ---
> >> sound/pci/hda/patch_hdmi.c | 8 ++++++--
> >> 1 file changed, 6 insertions(+), 2 deletions(-)
> >> So far this is the workaround we have found to be working. Sometimes, it also
> >> seems that "cat /proc/asound/cardx/codec#x" can also make the HDMI unsol event
> >> trigger, so that the problem fixes itself.
> >> We have not run any battery life tests to see if this causes more power consumption.
> > Looks safe at least, so I applied to for-next branch to give more
> > testing. If you find a better solution, let me know.
> Jesse has now done a battery life test, both for idle machine and S3
> machine, and both with HDMI connected and HDMI unconnected.
> All differences in power consumption were within error margins. Given
> that, should we consider sending this patch to stable?
Well, once when it hits to Linus tree. It's in for-next branch, and I
don't want to rebase the branch. So, wait for the next merge window,
which will happen likely in a couple of weeks.
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