linux-kernel - Re: [now bisected] i915: 2.6.36-rc2 hoses my Intel display

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Message-ID: <20100823173225.2bda6f78@bike.lwn.net>
Date:	Mon, 23 Aug 2010 17:32:25 -0600
From:	Jonathan Corbet <corbet@....net>
To:	Chris Wilson <chris@...is-wilson.co.uk>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	dri-devel@...ts.freedesktop.org, Eric Anholt <eric@...olt.net>
Subject: Re: [now bisected] i915: 2.6.36-rc2 hoses my Intel display

On Mon, 23 Aug 2010 23:36:55 +0100
Chris Wilson <chris@...is-wilson.co.uk> wrote:

> Taking the patch at face value, the cause should be a mistake in error
> handling. So the first step would be to identify which i2c_transfer()
> failed.

OK, I tried it, but neither warning triggers.

Don't know if it helps or not, but I tried booting with
drm.debug=0x05.  The result was truly vast amounts of stuff like this:

Aug 23 17:20:59 bike kernel: m:drm_ioctl], pid=2032, cmd=0x6458
nm:drm_ioctl], pid=2032, cmd=0x6458, nm:drm_ioctl], pid=2032, cmd=0x645
m:drm_ioctl], pid=2032, cmd=0x6458 m:drm_ioctl], pid=2032, cmd=0x6458,
m:drm_ioctl], pid=2032, cmd=0x6458, nm:drm_ioctl], pid=2032, cmd=0x6458
nm:drm_ioctl], pid=2032, cmd=0x6458 m:drm_ioctl], pid=2032, cmd=0x6458
nm:drm_ioctl], pid=2032, cmd=0x6458 nm:drm_ioctl], pid=2032, cmd=0x6458,
nm:drm_ioctl], pid=2032, cmd=0x6458, nm:drm_ioctl], pid=2032, cmd=0x6458
nm:drm_ioctl], pid=2032, cmd=0x6458 m:drm_ioctl], pid=2032, cmd=0x6458
nm:drm_ioctl], pid=2032, cmd=0x6458, nm:drm_ioctl], pid=2032, cmd=0x6458
m:drm_ioctl], pid=2032, cmd=0x6458 nm:drm_ioctl], pid=2032, cmd=0x6458,
nm:drm_ioctl], pid=2032, cmd=0x6458 m:drm_ioctl], pid=2032, cmd=0x6458
nm:drm_ioctl], pid=2032, cmd=0x6458 nm:drm_ioctl], pid=2032, cmd=0x6458,
nm:drm_ioctl], pid=2032, cmd=0x6458, m:drm_ioctl], pid=2032, cmd=0x6458,
nm:drm_ioctl], pid=2032, cmd=0x6458 nm:drm_ioctl], pid=2032, cmd=0x6458
nm:drm_ioctl], pid=2032, c

The above is one line from the system log; I took the liberty of wrapping
it for readability.  

jon
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