linux-kernel - Re: [2.6.25-rc6] possible regression: X server dying

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Date:	Thu, 24 Apr 2008 18:03:30 +0200 (CEST)
From:	Guennadi Liakhovetski <g.liakhovetski@....de>
To:	Dave Airlie <airlied@...il.com>
cc:	Gerhard Pircher <gerhard_pircher@....net>,
	linux-kernel@...r.kernel.org, adaplas@...il.com,
	linux-fbdev-devel@...ts.sourceforge.net
Subject: Re: [2.6.25-rc6] possible regression: X server dying

On Tue, 8 Apr 2008, Guennadi Liakhovetski wrote:

> Hm, so looks like I'm not seeing some ghosts on mine either. 2.6.25-rc8 
> xorg runs under etch, but enters a tight (no syscalls) loop woth 100% CPU 
> load under lenny. A 2.6.24 based kernel works under both etch and lenny... 
> Haven't had time to try to localize the problem. Glint xorg driver, DRM 
> and AGP are off, CONFIG_FB_PM2=y.

Ok, here's more info. It DOES seem to be a regression. I spent half a day 
yesterday trying to trace this down, with no success. Multiple bisect 
attempts ended up with non-bootable kernels on the very first iteration. 
Today I just wanted to post all possible logs / configs to Bugzilla and - 
it "suddenly" worked... And the change that made it work was - I disabled 
CONFIG_FB_PM2 in the kernel...

So, I think, this shall be qualified as a regression, although, I have no 
idea where. pm2fb.c itself hasn't (effectively for little endian) changed 
since 2.6.24. To make it visual

		etch		lenny

v2.6.24		works		works
v2.6.25		works		fails

/me thinks he should trade his ap400 to the Linux Kernel Testers Inc. for 
LOTS of money.

Thanks
Guennadi
---
Guennadi Liakhovetski
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