linux-kernel - Re: [PATCH] pci: Add quirk for still enabled interrupts on Intel Sandy Bridge GPUs

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Message-ID: <20120127092840.52e7567e@jbarnes-desktop>
Date:	Fri, 27 Jan 2012 09:28:40 -0800
From:	Jesse Barnes <jbarnes@...tuousgeek.org>
To:	Thomas Jarosch <thomas.jarosch@...ra2net.com>
Cc:	linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
	Charlie Suffin <charlie.suffin@...atus.com>, stable@...nel.org
Subject: Re: [PATCH] pci: Add quirk for still enabled interrupts on Intel
 Sandy Bridge GPUs

On Tue, 10 Jan 2012 11:45:52 +0100
Thomas Jarosch <thomas.jarosch@...ra2net.com> wrote:

> On Wednesday, 7. December 2011 22:08:11 Thomas Jarosch wrote:
> > Some BIOS implementations leave the Intel GPU interrupts enabled,
> > even though no one is handling them (f.e. i915 driver is never loaded).
> > Additionally the interrupt destination is not set up properly
> > and the interrupt ends up -somewhere-.
> > 
> > These spurious interrupts are "sticky" and the kernel disables
> > the (shared) interrupt line after 100.000+ generated interrupts.
> > 
> > Fix it by disabling the still enabled interrupts.
> > This resolves crashes often seen on monitor unplug.
> 
> Happy new year 2012!
> 
> Any news on the status of this patch?

Did you get my last reply:

Could really be dev_dbg, I think this will be fairly common.  I think we
also need to ack any outstanding interrupts after disabling them in IER
by writing IIR back on itself. Can you test that?

Other than that I'd like to apply it.

Thanks,
-- 
Jesse Barnes, Intel Open Source Technology Center

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