linux-kernel - Re: [Bisected] Output to external monitor is broken (Re: Linux 2.6.31-rc9)

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Date:	Tue, 08 Sep 2009 12:59:48 +0800
From:	ykzhao <yakui.zhao@...el.com>
To:	"Carlos R. Mafra" <crmafra2@...il.com>
Cc:	Linus Torvalds <torvalds@...ux-foundation.org>,
	"Ma, Ling" <ling.ma@...el.com>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Eric Anholt <eric@...olt.net>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [Bisected] Output to external monitor is broken (Re: Linux
	2.6.31-rc9)

On Tue, 2009-09-08 at 03:12 +0800, Carlos R. Mafra wrote:
> On Mon  7.Sep'09 at 11:37:39 -0700, Linus Torvalds wrote:
> >   Carlos - can you also do the full dmesg _with_ the corruption? I realize 
> >   that your screen is unreadable, but if you can just log in blindly, and
> >   do a "dmesg > saved-dmesg-file" and then do a clean reboot? No need for 
> >   a serial console or anything fancy - I assume the machine is still 
> >   working, just with bad output.
> > 
> >   It might also be a good idea to boot with "drm.debug=15" to enable much 
> >   more debugging output.
> > 			- Linus ]
> 
> I am no longer at the institute with the monitor to test, but I've already
> uploaded similar debug info to the bugzilla upon ykzhao's request this
> morning (but I think you were not Cc:-ed on that request, though).
Will you please connect the external monitor after the system is already
booted and then enter the X-mode to see whether the external monitor can
work well?
Do you have opportunity to try another external monitor and see whether
this issue still happens?

It will be great if you can attach the output of dmesg with the boot
option of "drm.debug=15" on the failing/working kernel when you can use
the monitor.

Thanks.
> 
> http://bugzilla.kernel.org/show_bug.cgi?id=14139
> 
> PS: The external monitor is unreadable, but the laptop's screen is still good.

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