I have a Lenovo T430 laptop with both Intel IGD and Nvidia GF108. I've enabled
Optimus in BIOS. Distro currently is Fedora 18 x86_64 with Linux kernel 3.10.4.
I had the same problem with earlier kernel versions aswell.
It seems the nouveau output connector names in xrandr are inconsistent and
change between reboots, depending "how" the laptop is rebooted (DVI cabled
plugged in or not). I'm using a Lenovo docking station, which has DVI
connectors for external monitors. These DVI connectors are actually connected
to the DisplayPort outputs on nouveau. Laptop is in the docking station during
all these tests.
If DVI cable is NOT connected to docking station at laptop boot time then
nouveau outputs are called DP-1, DP-2 and DP-3 in xrandr output. This is
reliable and consistent, and it's the same on every reboot without DVI cable
plugged in. All fine so far.
But when the DVI cable actually *is* plugged in to the dock at laptop boot time
things get more weird.. During most reboots (but not all, see below) there are
zero outputs reported for nouveau in xrandr! In /sys/class/drm/card*/status
files I can still see correct outputs and their status, it's only xrandr that
doesn't show anything for nouveau. Any ideas why this happens? Also in this
case I can see some weird black/white pattern on the external DVI monitor..
even when the DVI output is not supposed to be enabled/activated.. and there's
no way to actually activate it myself because xrandr doesn't show any outputs
for nouveau.
As mentioned above there's the more rare case aswell.. during *some* reboots
with DVI cable plugged in to the dock, maybe one out of five reboots, there's
no black/white pattern on the external DVI monitor, it's all black like it
should be, and xrandr actually shows the nouveau output connector names! But
they're called Displayport-0, DisplayPort-1 and DisplayPort-2 in xrandr output.
So not DP-1, DP-2 and DP-3 like when the laptop is booted without DVI cable..
Why the difference in output names? And any guesses why on most reboots there
are zero outputs detected? I can pretty reliably reproduce this and I'm willing
to do more debugging as needed.
also in the rare case when the outputs are called DisplayPort-0, DisplayPort-1,
DisplayPort-2 in xrandr output actually enabling them crashes the kernel, but
that's probably a separate issue, and I've filed a separate bug about the
kernel crash: https://bugs.freedesktop.org/show_bug.cgi?id=64774 .
xrandr output with *no* DVI cable connected at boot time:
Screen 0: minimum 320 x 200, current 1600 x 900, maximum 8192 x 8192
LVDS1 connected 1600x900+0+0 (normal left inverted right x axis y axis) 309mm x
174mm
1600x900 60.0*+ 40.0
1024x768 60.0
800x600 60.3 56.2
640x480 59.9
VGA1 disconnected (normal left inverted right x axis y axis)
LVDS-2 disconnected (normal left inverted right x axis y axis)
VGA-2 disconnected (normal left inverted right x axis y axis)
DP-1 disconnected (normal left inverted right x axis y axis)
DP-2 disconnected (normal left inverted right x axis y axis)
DP-3 disconnected (normal left inverted right x axis y axis)
xrandr output with DVI cable connected at boot time (the rare case when nouveau
outputs are actually detected):
Screen 0: minimum 320 x 200, current 1600 x 900, maximum 8192 x 8192
LVDS1 connected 1600x900+0+0 (normal left inverted right x axis y axis) 309mm x
174mm
1600x900 60.0*+ 40.0
1024x768 60.0
800x600 60.3 56.2
640x480 59.9
VGA1 disconnected (normal left inverted right x axis y axis)
LVDS-1 disconnected
VGA-1 disconnected
DisplayPort-0 disconnected
DisplayPort-1 connected
1920x1080 59.9 +
1600x1200 60.0
1680x1050 59.9
1280x1024 60.0
1440x900 59.9
1280x960 60.0
1280x800 59.9
1024x768 60.0
800x600 60.3 56.2
640x480 60.0
DisplayPort-2 disconnected
1024x768 (0x47) 65.0MHz
h: width 1024 start 1048 end 1184 total 1344 skew 0 clock 48.4KHz
v: height 768 start 771 end 777 total 806 clock 60.0Hz
800x600 (0x48) 40.0MHz
h: width 800 start 840 end 968 total 1056 skew 0 clock 37.9KHz
v: height 600 start 601 end 605 total 628 clock 60.3Hz
800x600 (0x49) 36.0MHz
h: width 800 start 824 end 896 total 1024 skew 0 clock 35.2KHz
v: height 600 start 601 end 603 total 625 clock 56.2Hz