From: Stanislaw Gruszka <sgruszka@redhat.com>
To: Johannes Berg <johannes@sipsolutions.net>
Cc: Jorge Miguel <jmiggal@gmail.com>, linux-wireless@vger.kernel.org
Subject: Re: Setting my WiFi adhoc connection in power save mode
Date: Fri, 13 May 2011 14:22:36 +0200 [thread overview]
Message-ID: <20110513122235.GC5516@redhat.com> (raw)
In-Reply-To: <1305287703.3487.16.camel@jlt3.sipsolutions.net>
On Fri, May 13, 2011 at 01:55:03PM +0200, Johannes Berg wrote:
> > Also in kernel 2.6.39, after driver split into iwlegacy, power save
> > is marked as not supported by driver. I wonder it was deliberate action
> > from Intel developers, or just IEEE80211_HW_SUPPORTS_PS is missed by
> > mistake. I'm going to look at this.
>
> Deliberate. On some platforms/systems, the way the device goes to sleep
> caused DMA trouble or something like that, and the ucode would sysassert
> when it tried to wake itself up. The problem was fairly rare, but of
> course the device wakes up 10 times a second or so ...
It's interesting if PS on 3945 ever works or was broken from very
beginning. I bet it was, on some old kernel, and this issue is similar
case like most of other bugs we have in iwlwifi - something that worked
well was broken by adding new chipsets/features support, but never fixed
again and just masked/disabled instead.
Stanislaw
next prev parent reply other threads:[~2011-05-13 12:22 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-05-12 17:02 Setting my WiFi adhoc connection in power save mode Jorge Miguel
2011-05-13 11:50 ` Stanislaw Gruszka
2011-05-13 11:55 ` Johannes Berg
2011-05-13 12:22 ` Stanislaw Gruszka [this message]
2011-05-13 12:27 ` Johannes Berg
2011-05-13 12:39 ` Stanislaw Gruszka
2011-05-13 12:45 ` Johannes Berg
2011-05-13 21:15 ` Jorge Miguel
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=20110513122235.GC5516@redhat.com \
--to=sgruszka@redhat.com \
--cc=jmiggal@gmail.com \
--cc=johannes@sipsolutions.net \
--cc=linux-wireless@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.