linux-kernel - Re: BCM4312 Fails when xdm is started

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Date:	Sun, 7 Dec 2008 11:29:27 +0200
From:	Yuval Hager <yuval@...amzon.net>
To:	Peter Stuge <peter@...ge.se>
Cc:	Larry Finger <Larry.Finger@...inger.net>,
	wireless <linux-wireless@...r.kernel.org>,
	LKML <linux-kernel@...r.kernel.org>,
	Michael Buesch <mb@...sch.de>, bcm43xx-dev@...ts.berlios.de
Subject: Re: BCM4312 Fails when xdm is started

On Tuesday 25 November 2008, Peter Stuge wrote:
> Yuval Hager wrote:
> > I played around with different video drivers and the results are:
> > * If using the 'via' driver, I lose the PCIe card immediately upon
> >   initialization
> > * Using the 'openchrome' (trunk version), It works well in the
> >   beginning.
> >   After first blanking the register reads are all 1's, and then
> >   when the screen is blank I get a different read (some registers
> >   are correct, some are wrong), and when the screen is unblanked, I
> >   get 0xff's again. Very consistent and predictabe (same read every
> >   time).
> > * Using the 'vesa' driver I could not recreate the problem. I could
> >   not get the screen to blank for some reason, but closing the lid,
> >   going on standby/hibernate, restarting X - all didn't matter much
> >   to the PCI and the wireless card kept on working.
>
> Good work! You have beyond any doubt established that the X graphics
> driver can cause this problem.
>

This issue has been tracked down to be at the openchrome driver. It appears 
that somehow it corrupted the PCI bus, and damaged the device right after the 
video card - the wireless card. 

The current workaround for this is here - 
http://wiki.openchrome.org/pipermail/openchrome-devel/2008-November/000139.html - 
but this is just a quick hack, not a fix, although it works great for me. The 
openchrome team is working on a patch based on this.

Thanks for all the help - I am a very happy HP2133 user, and a very happy 
community member. This was an amazing opensource support experience, which 
I'll remember for a long time. Thank you all!

Cheers,

-- 
Yuval Hager
[@] yuval@...amzon.net

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