linux-kernel - Re: [git pull] agp patches for 2.6.28-rc1.

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Message-Id: <1224466521.5303.41.camel@koto.keithp.com>
Date:	Sun, 19 Oct 2008 18:35:21 -0700
From:	Keith Packard <keithp@...thp.com>
To:	Andres Freund <andres@...razel.de>
Cc:	keithp@...thp.com, Dave Airlie <airlied@...ux.ie>,
	linux-kernel@...r.kernel.org
Subject: Re: [git pull] agp patches for 2.6.28-rc1.

On Mon, 2008-10-20 at 03:00 +0200, Andres Freund wrote:

> Hm. But still, there is at least one distribution (ubuntu intrepid) which will 
> propably will ship 2.4.1 in its stable version soon (it seems unlikely that 
> they will update to an unstable version just before an release).

We can backport the fix (it's tiny) to the 2.4 2D driver.

> Which means, that this driver will get quite some spread...
> Is it accepted that the kernel abi breaks that radically/fast?

We tested a pile of hardware and didn't find any GM45s that worked, so
we assumed they were all broken and that fixing the bug wouldn't cause
any working configurations to stop working.

We can hack up the kernel so the old X server just gets a WARN_ON
instead of breaking. This is a bit worrying though; the "fix" would let
user space continue to mis-program the hardware.

My concern here is that a common failure mode with this bug was to lock
up the graphics hardware and require a reboot. Having the X server fail
to start and leave the system in text mode where new packages can be
installed seems like a better mode than making the system hang during
boot.

-- 
keith.packard@...el.com

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