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Bug#586448: New Kernel with KMS and Nouveau Defaults, External DVI Fails



On 01/29/2011 11:48 PM, Cyril Brulebois wrote:
retitle 586448 External DVI fails with nouveau
thanks

Hi Gilbert.

Gilbert Sullivan<whirlygig@comcast.net>  (19/06/2010):
So sorry for muddled attempt to use reportbug.

No problem. I'm adjusting the title with the command above. That might
be a bug in xserver-xorg-video-nouveau, or in the kernel, but let's
talk a bit first.

Notebook computer with external LCD connected via port replicator
(both D-Sub and DVI connectors). Since latest linux-image,
xserver-common and xserver-xorg-core upgrades in Squeeze the
external LCD does not work with the DVI but does work with the VGA
connector.

Is that still true with an up-to-date X stack + kernel in squeeze/sid?

If so please run the xorg bug script and attach its output:
   /usr/share/bug/xserver-xorg-core/script 3>/tmp/script.log

Hello, Cyril.

I have the system on testing (replaced "squeeze" with "testing" a couple of months ago). As of my last attempt -- no more than 2 weeks ago -- I still couldn't use DVI through the port replicator, and VGA was working fine.

Here's the rub. on 01/27 I could no longer use the port replicator at all. (I could turn on the the system through the port replicator, but the power and eject buttons were not lighting correctly, and I had no screen output at all (past BIOS screen and early boot sequence) on the monitor and no mouse and keyboard through the port replicator. (I had to open the lid and power down from the built-in keyboard.)

I tried another known good port replicator, and that behaved exactly the same. Since the abnormal behavior is indicated with the system before it is even energized (improper button lighting on the port replicator), it's obvious that this is a hardware problem. And since the known good port replicator behaves exactly the same, the hardware must be a problem with the motherboard/connector on the Dell Precision M70.

Since all other functions on the system have been perfect all along, I can't be sure that the DVI issue was also a hardware problem. But I have to at least be suspicious of that since this is the 5th motherboard Dell has put in this thing. (Boy, did I ever get my money's worth out of that 5-year extended next business day warranty! Well, at least if you exclude all the times it failed on me when I needed it.)


Before the switch to kernel mode setting and nouveau, both types of
connection for the external monitor worked. Built-in monitor is
unaffected.

I seem to recall nouveau has always been KMS-only? What were you using
previously? The nv or vesa driver maybe?

VESA


No proprietary drivers of any kind have been installed on this
system since a clean netinst of Squeeze a few months ago.

Thanks for mentioning it.

KiBi.

Thank you very much for your interest. There appears that there might be no way for me to pursue the issue with you, but I'd be glad to do any research or testing that you can suggest that might be helpful. I should have any logs the system has kept, since it hasn't had a re-installation or anything like that.

Best regards,
Gilbert



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