[Nouveau] Bug Report on A1286 (Macbook Pro Mid 2012)

Wed Nov 30 17:58:46 UTC 2016

On Tue, Nov 29, 2016 at 11:31 PM, Lukas Wunner <lukas at wunner.de> wrote:
> On Tue, Nov 29, 2016 at 05:42:51PM -0500, Evan Foss wrote:
>> On Sun, Nov 27, 2016 at 4:13 AM, Lukas Wunner <lukas at wunner.de> wrote:
>> > On Sat, Nov 26, 2016 at 06:09:34AM +0000, Evan Foss wrote:
>> >> I did some other bug reports here a while back. I am back again
>> >> because I updated my kernel from 3.19.1 to linux-4.8.10-gentoo (if you
>> >> want I can test the mainline too). On boot all my GPU's turn on. If I
>> >> turn them off via
>> >> echo "OFF"> /sys/kernel/debug/vgaswitcheroo/switch
>> >> I can't turn them back on. They also do not turn on if I try to change
>> >> GPU's. Trying to stop xdm locks the machine so I can't even turn it
>> >> off. Suspend/resume still works. None of these problems existed in
>> >> 3.19.1. I know you will need more info to track down the problem but I
>> >> wanted to open with this.
>> >
>> > I have the same machine and it works for me.  System sleep is only
>> > supposed to work if both GPUs or ON upon suspend.  Are you issuing
>> > OFF while X11 is running?  Does it work if X11 is stopped?
>>
>> 1. Boot with the intel GPU driving the screen.
>> 2. In mate desktop turn off the nvidia gpu via echo "OFF" >
>> /sys/kernel/.../switch
>> 3. Try to do any of the following and the machine locks up turn on the
>> nvidia GPU, suspend the machine, try to change gpus, stop X (via
>> /etc/init.d/xdm stop)

Correction suspend works but hibernate does not.

>> Yes I issue OFF while it is running and it works perfectly to turn off
>> the GPU's. I can tell because the machine gets a lot cooler.
>
> On my machine issuing ON or OFF or switching always works but I only
> issue the commands on the console, without X11 running.  Does that
> work for you as well?

I am using a console inside mate. xdm runs at startup. I tried

1. stopping xdm
2. turning off the nvidia gpu at the console
3. starting xdm
and then each of the following
stoping xdm, turning off the computer, both work.

I don't care about changing GPU's with X running. That never worked
but I used to be able to turn them on and off with out having to leave
X. I don't understand why turning off a GPU that isn't generating any
video is a feature that got removed? Is there something as a
user/tester that I can do to help bring this back?

I don't expect GPU switching with X running to work any time soon.

> Manual power control via ON and OFF is a hack, it powers the GPU
> up and down behind the PM core's back.  It's a stopgap until
> runtime PM works for muxed machines.  That's the reason at least
> for the lockup on resume, I know what causes this.  (The PCI core
> invalidates the saved_state of the device.)  I don't know why
> turning on the GPU or stopping X causes a lockup, presumably on
> stopping X the card is accessed even though it's powered down.
>
> There are some half-baked patches for runtime PM on this branch:
> https://github.com/l1k/linux/commits/mbp_switcheroo_runpm_wip
>
> Alas, a rework of vga_switcheroo audio handling is necessary to
> bring up runtime PM for muxed machines properly:
> https://www.mail-archive.com/nouveau@lists.freedesktop.org/msg24997.html

I have only had trouble with the microphone input.

> Rafael Wysocki's functional dependencies patches, which are a
> prerequisite for this rework, are now queued for 4.10.  I'll
> probably look into this in December/January.
>
> Switching while X is running won't work anytime soon, I'm not
> working on it and Dave Airlie has basically said that it has no
> priority for him:
> https://www.mail-archive.com/intel-gfx@lists.freedesktop.org/msg81981.html
>
> On the bright side, you got Thunderbolt when you updated to 4.8 and
> in 4.11 it'll even power itself down when nothing is plugged in and
> save you 1.7 Watts. ;-)

Thanks I didn't know that.

> Best regards,
>
> Lukas

Thank you,
Evan

-- 
Home
http://evanfoss.googlepages.com/
Work
http://forge.abcd.harvard.edu/gf/project/epl_engineering/wiki/

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