Discrete card seems to be powered on even if reported as Off
Submitted by Marcin Zajaczkowski
Assigned to Nouveau Project
Description
Following up Bug 70895.
On Fedora 21 with 3.17.3-300.fc21.x86_64 when booting with nouveau.runpm=0 I have both cards on:
$ $ sudo cat /sys/kernel/debug/vgaswitcheroo/switch
0:IGD:+:Pwr:0000:00:02.0
1:DIS: :Pwr:0000:01:00.0
and after:
echo OFF > /sys/kernel/debug/vgaswitcheroo/switch
I have:
0:IGD:+:Pwr:0000:00:02.0
1:DIS: :Off:0000:01:00.0
Looks ok, but I still see 3 providers:
$ xrandr --listproviders
Providers: number : 3
Provider 0: id: 0x90 cap: 0xb, Source Output, Sink Output, Sink Offload crtcs: 3 outputs: 5 associated providers: 2 name:Intel
Provider 1: id: 0x63 cap: 0x7, Source Output, Sink Output, Source Offload crtcs: 2 outputs: 2 associated providers: 2 name:nouveau
Provider 2: id: 0x63 cap: 0x7, Source Output, Sink Output, Source Offload crtcs: 2 outputs: 2 associated providers: 2 name:nouveau
and system temperature could suggest that the card is still on.
When I use (on the second kernel) bbswitch with bumblebee I see only one provider and the temperature is a few (~6) degrees lower.
I see no messages from VGA switcheroo in the system log (as there were in 3.11.6). Can I make output more verbose or do something else to provide more details about the situation?
System specification:
Asus N43SN
GeForce GT 550M + integrated Intel card using i915 driver (NVidia Optimus)
kernel-3.17.3-300.fc21.x86_64
xorg-x11-drv-nouveau-1.0.11-1.fc21.x86_64
xorg-x11-server-Xorg-1.16.1-1.fc21.x86_64
Btw, on that system there is also problem with auto-suspending (with not disabled nouveau.runpm) - a card is always in DynPwr - Bug 70875.