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

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Date:	Tue, 25 Nov 2008 08:18:18 +0100
From:	Peter Stuge <peter@...ge.se>
To:	Yuval Hager <yuval@...amzon.net>
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

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.

Were you using a kernel framebuffer driver when you saw the problem
also without running X at all? If not, the cause of trouble then is
still unidentified.


//Peter

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