Strange problem with dual head on GeForce9600GT (dual DVI)

Strange problem with dual head on GeForce9600GT (dual DVI)

[Abelenda Diego]

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Hi,

I am using nouveau for some time now, I am quite happy with it. I had
two screens connected with DVI to VGA adapters and dual screen was
working no problem. Today I decided to replace the DVI to VGA adapters
with plain DVI-I dual link cables and found out something strange, the
second screen doesn't display anything anymore, it stays black.

I am using gentoo linux with
Linus' kernel 2.6.35_rc4
libdrm 2.4.21
media-libs/mesa 7.8.2
x11-drivers/xf86-video-nouveau 0.0.16_pre20100615

Is it somehow related to
https://bugs.freedesktop.org/show_bug.cgi?id=27455 or do I need to open
a new bug report, with some dumps from renouveau ?

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Re: Strange problem with dual head on GeForce9600GT (dual DVI)

[Abelenda Diego]

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On Tue, 13 Jul 2010 18:42:31 +0200
Abelenda Diego <diego.abelenda-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:

> Hi,
> 
> I am using nouveau for some time now, I am quite happy with it. I had
> two screens connected with DVI to VGA adapters and dual screen was
> working no problem. Today I decided to replace the DVI to VGA adapters
> with plain DVI-I dual link cables and found out something strange, the
> second screen doesn't display anything anymore, it stays black.
> 
> I am using gentoo linux with
> Linus' kernel 2.6.35_rc4
> libdrm 2.4.21
> media-libs/mesa 7.8.2
> x11-drivers/xf86-video-nouveau 0.0.16_pre20100615
> 
> Is it somehow related to
> https://bugs.freedesktop.org/show_bug.cgi?id=27455 or do I need to
> open a new bug report, with some dumps from renouveau ?

Sorry my cables are not DVI-I dual link they are DVI-D dual link (this
might make a difference).

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Re: Strange problem with dual head on GeForce9600GT (dual DVI)

[Ben Skeggs]

On Tue, 2010-07-13 at 18:46 +0200, Abelenda Diego wrote:
> On Tue, 13 Jul 2010 18:42:31 +0200
> Abelenda Diego <diego.abelenda-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org> wrote:
> 
> > Hi,
> > 
> > I am using nouveau for some time now, I am quite happy with it. I had
> > two screens connected with DVI to VGA adapters and dual screen was
> > working no problem. Today I decided to replace the DVI to VGA adapters
> > with plain DVI-I dual link cables and found out something strange, the
> > second screen doesn't display anything anymore, it stays black.
> > 
> > I am using gentoo linux with
> > Linus' kernel 2.6.35_rc4
> > libdrm 2.4.21
> > media-libs/mesa 7.8.2
> > x11-drivers/xf86-video-nouveau 0.0.16_pre20100615
> > 
> > Is it somehow related to
> > https://bugs.freedesktop.org/show_bug.cgi?id=27455 or do I need to
> > open a new bug report, with some dumps from renouveau ?
> 
> Sorry my cables are not DVI-I dual link they are DVI-D dual link (this
> might make a difference).
I doubt it's related to the bug you mentioned, the display engines are
completely different.

If you could attach your dmesg output after booting with "log_buf_len=1M
drm.debug=14 nouveau.reg_debug=0x0200" I'll take a look and see if some
of the recent fixes could apply to you.

Thanks!
Ben.
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