linux-kernel - Re: 3.5.x boot hang after conflicting fb hw usage <driver> vs VESA VGA

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Date:	Fri, 17 Aug 2012 15:28:54 -0700
From:	Randy Dunlap <rdunlap@...otime.net>
To:	"Justin M. Forbes" <jforbes@...hat.com>
CC:	linux-kernel@...r.kernel.org, kernel-team@...oraproject.org,
	dri-devel@...ts.freedesktop.org
Subject: Re: 3.5.x boot hang after conflicting fb hw usage <driver> vs VESA
 VGA - removing generic driver

On 08/17/2012 03:25 PM, Justin M. Forbes wrote:

> for <driver>, we have verified cases on inteldrmfb, radeondrmfb, and
> cirrusdrmfb.
> 
> This is the last message displayed before the system hangs.  This seems
> to be hitting a large number of users in Fedora, though certainly not
> everyone.  This started happening with the 3.5 updates, and is still an
> issue.  It appears to be a race condition, because various things have
> allowed boot to continue for some users, though there is no clear work
> around. Has anyone else run across this?  Any ideas.  For more
> background we have the following bugs:
> 
> inteldrmfb:
> https://bugzilla.redhat.com/show_bug.cgi?id=843826
> 
> radeondrmfb:
> https://bugzilla.redhat.com/show_bug.cgi?id=845745
> 
> cirrusdrmfb <kvm>:
> https://bugzilla.redhat.com/show_bug.cgi?id=843860
> 
> It should be noted that the conflicting fb hw usage message is not new,
> it has been around for a while, but this is the last message seen before
> the hang.


Hi,  (adding dri-devel mailing list)


I started seeing this problem on 3.5-rc6.

AFAICT, the system is not actually hung, it's just that no output
is showing up on the real (physical) output device (display) -- it's
going somewhere else (or to the bit bucket).

-- 
~Randy
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