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

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Date:	Mon, 7 Sep 2009 11:37:39 -0700 (PDT)
From:	Linus Torvalds <torvalds@...ux-foundation.org>
To:	"Carlos R. Mafra" <crmafra2@...il.com>,
	Ma Ling <ling.ma@...el.com>,
	Jesse Barnes <jbarnes@...tuousgeek.org>,
	Zhao Yakui <yakui.zhao@...el.com>,
	Eric Anholt <eric@...olt.net>
cc:	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [Bisected] Output to external monitor is broken (Re: Linux
 2.6.31-rc9)


[ Just adding all the right people to the email participants line.
  Eric, Jesse, Zhao, Ma Ling - should I just revert that commit?

  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 ]

On Sun, 6 Sep 2009, Carlos R. Mafra wrote:
>
> On Sat  5.Sep'09 at 16:54:27 -0700, Linus Torvalds wrote:
> > Go wild, and please give this a final round of testing.
> 
> The output from my Vaio laptop to the external monitor (LG Flatron M228WD) 
> is broken now. The screen is all messed-up once the boot messages from the
> kernel appear on it (see the picture at the link below).
> 
> I bisected it down to f8aed700c6ec46ddade6570004ce25332283b306 ("drm/i915:
> Set crtc/clone mask in different output devices"). I doubled checked
> that reverting this commit from 2.6.31-rc9 fixes the problem.
> 
> The picture of the bad output is here:
> http://www.aei.mpg.de/~crmafra/bad_output.jpg
> 
> as well as my config:
> http://www.aei.mpg.de/~crmafra/config-2.6.31-rc9.txt
> 
> and dmesg (with the above commit reverted):
> http://www.aei.mpg.de/~crmafra/dmesg-2.6.31-rc9+revert.txt
> 
> (the vga=0x0364 in the command line does not work since I
> enabled KMS, so I get a prompt in the beginning from which I 
> choose vga=0. But the above regression is not affected by this
> choice because the command line was always the same during 
> bisection)
> 
> If there is anything else I can do, just let me know.
> 
> 
> 
> 
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