Bug 58021

Summary:	[BISECTED] nouveau, nv50: External VGA not detected anymore
Product:	Drivers	Reporter:	wippbox
Component:	Video(DRI - non Intel)	Assignee:	drivers_video-dri
Status:	RESOLVED CODE_FIX
Severity:	normal	CC:	drewfrank, per.arnold
Priority:	P1
Hardware:	i386
OS:	Linux
Kernel Version:	3.7.0-rc4+ - 3.9	Subsystem:
Regression:	No	Bisected commit-id:
Attachments:	dmesg for last good commit dmesg for first bad commit Dmesg using kernel 3.8.11 Dmesg using kernel 3.9.4 (bad)

Description wippbox 2013-05-12 09:25:53 UTC

Created attachment 101211 [details]
dmesg for last good commit

I have a lenove thinkpad T61p with a NVIDIA Corporation G84GLM [Quadro FX 570M].
When connecting my external VGA monitor my monitor is no more detected properly:
> cat /sys/class/drm/card0-VGA-1/status
gives now "disconnected"

Last good commit is
ef22c8bb7b3fac45919b7fde412d36d1a8367d51
drm/nv50/disp: call into core to handle dac/sor power state changes

First bad commit is
7ebb38b556485449bfaa506a196439f6a6fd6ebd
drm/nv50/disp: call into core for dac load detection

The responsible function is
nv50_dac_detect in drivers/gpu/drm/nouveau/nv50_dac.c (moved to drivers/gpu/drm/nouveau/nv50_display.c in more recent kernels).

Also tried a 3.9.1 kernel. The problem still remains.

However, replacing nv50_dac_detect with the corresponding version from the last good commit fixed the problem (tried a 3.8.10 kernel).

Comment 1 wippbox 2013-05-12 09:26:26 UTC

Created attachment 101221 [details]
dmesg for first bad commit

Comment 2 Per Arnold Blåsmo 2013-05-29 13:15:11 UTC

I seem to have much of the same problem.
I am running a Dell desktop with  NVIDA Quadro NVS 295 graphic card and two identical Dell monitors attache via DisplayPort.

I run Fedora 18 with all latest updates and using Nouveau drivers.

Starting with Kernel 3.8.11 it boots OK and both monitors works as expected.
Starting with Kernel 3.9.2, 3.9.3 or 3.9.4 boots and when trying to display anything on monitor two it gets into problems.

It boots until its tries to start the Xorg server and then monitor 2 starts flickering on and off. Monitor 1 stays with the boot logo of fedora.

Also during boot when booting I only have the boot logo of fedora on monitor 1 when running kernel 3.9.x while I have it on both screens when running kernel 3.8.11

I am able to hit CTRL+f2 to get a text login.

I will attache my dmesg output for both kernels.

Comment 3 Per Arnold Blåsmo 2013-05-29 13:26:24 UTC

Created attachment 102831 [details]
Dmesg using kernel 3.8.11

Comment 4 Per Arnold Blåsmo 2013-05-29 13:27:03 UTC

Created attachment 102841 [details]
Dmesg using kernel 3.9.4 (bad)

Comment 5 wippbox 2013-05-29 14:50:19 UTC

I don't that this is related to this bug. Here the monitor stays blank as soon as the nouveau driver is loaded.

For more info:
https://bugs.freedesktop.org/show_bug.cgi?id=64904

Comment 6 wippbox 2013-06-20 07:40:23 UTC

Solved in https://bugs.freedesktop.org/show_bug.cgi?id=64904