Re: [ipw3945-devel] [BUG] iwlwifi 3945 works only with disable_hw_scan=1

["John W. Linville" <linville@tuxdriver.com>]

On Fri, Jun 13, 2008 at 03:35:23PM +0800, Zhu Yi wrote:
> On Thu, 2008-06-12 at 09:59 -0400, John W. Linville wrote:
> > How does the hardware scan differ from what mac80211 does when
> > scanning?
> 
> Software scan disables Tx during the scan process while hardware scan
> doesn't. So you are expected to see continous ping responds instead of a
> freeze during the scan period. Hardware scan is also more efficient
> since it is handled by the firmware.
> 
> > I still see a lot of mysterious iwlwifi (especially iwl3945)
> > problems in Fedora that seem to disappear with disable_hw_scan=1.
> 
> I don't see this problem from my side. I'll do more testing for 3945.

FWIW, I don't have a reproducing environment that requires
disable_hw_scan either.  But I could probably dig-out several Fedora
bug reports that claim to need it.

> > Honestly I'm tempted to change it to "enable_hw_scan" instead...
> 
> Give the advantages, I'd like to use it if we can fix the bug (I haven't
> seen what the bug is myself). But you are free to change the default
> value until it is fixed. There is no such problem for 4965, right?

AFAICT only the 3945 seems to need it.

John
-- 
John W. Linville
linville@tuxdriver.com