linux-kernel - Re: 2.6.39-rc1 nouveau regression (bisected)

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Date:	Sun, 17 Apr 2011 19:20:48 +0200
From:	Dominik Brodowski <linux@...inikbrodowski.net>
To:	Nigel Cunningham <lkml@...elcunningham.com.au>
Cc:	Marcin Slusarz <marcin.slusarz@...il.com>,
	Ben Skeggs <bskeggs@...hat.com>, airlied@...hat.com,
	dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
	mjg@...hat.com, maciej.rutecki@...il.com,
	nouveau@...ts.freedesktop.org
Subject: Re: 2.6.39-rc1 nouveau regression (bisected)

Hey,

On Sun, Apr 17, 2011 at 08:12:35AM +1000, Nigel Cunningham wrote:
> On 15/04/11 16:11, Dominik Brodowski wrote:
> > On Thu, Apr 14, 2011 at 09:02:01PM +0200, Marcin Slusarz wrote:
> >> On Thu, Apr 14, 2011 at 07:05:59PM +0200, Dominik Brodowski wrote:
> >>> Thought about CCing Linus to show him that 2.6.39-rcX isn't as "calm"
> >>> to everyone, but then chose to CC Maciej instead: Would you be so kind and
> >>> add this to your regression list? Thanks!
> >>>
> >>> Since commit 38f1cff
> >>>
> >>>     From: Dave Airlie <airlied@...hat.com>
> >>>     Date: Wed, 16 Mar 2011 11:34:41 +1000
> >>>     Subject: [PATCH] Merge commit '5359533801e3dd3abca5b7d3d985b0b33fd9fe8b' into dr
> >>>
> >>>     This commit changed an internal radeon structure, that meant a new driver
> >>>     in -next had to be fixed up, merge in the commit and fix up the driver.
> >>>
> >>>     Also fixes a trivial nouveau merge.
> >>>
> >>>     Conflicts:
> >>>         drivers/gpu/drm/nouveau/nouveau_mem.c
> >>>
> >>> booting my atom/NM10/ION2 system crashes hard during boot, right after
> >>> blanking the screen, and before the initramfs gets loaded. I just
> >>> re-checked: both parent commits ( 5359533 and 4819d2e ) do indeed work
> >>> just fine, but the merge commit ( 38f1cff ) fails, same as tip ( 85f2e68 ).
> >> Can you activate netconsole and check whether kernel spits anything interesting?
> >> You might try to load nouveau module after boot - maybe something will be saved
> >> to /var/log or you could even ssh into the box and check dmesg...
> > Compiling it as a module seems to work fine. When I do so, no regression is
> > obvious from what gets reported in "dmesg". However, somehow I now do get
> > some output: The last message I see is
> >
> > [drm] nouveau 0000:01:00.0: allocated 1680x1050, fb 0x40.... b0 <some pointer value>
> >
> > Then, nothing more. However, it really is quite strange why this error only
> > appears in the CONFIG_NOUVEAU=y case, not in the =m case...
> Try disabling CONFIG_BOOT_LOGO. I reported on freedesktop.org that it is
> causing me an oops at boot, but my bug has been ignored there so far -
> perhaps I should have posted it here instead.

indeed, setting CONFIG_LOGO=n makes it boot. Same as compiling nouveau as a
module. With all the different bisect results and reverts which make it
work, it seems to me to be a timing / interference issue...

Best,
	Dominik
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