[Nouveau] [Bug 98398] Acer Aspire V7-582PG (Haswell, GTX 750M) fails to power off GPU with runtime PM

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=98398

Peter Wu <peter at lekensteyn.nl> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|[Nouveau] Vgaswitcharoo     |Acer Aspire V7-582PG
                   |fails to turn off GPU       |(Haswell, GTX 750M) fails
                   |properly                    |to power off GPU with
                   |                            |runtime PM
                 CC|                            |peter at lekensteyn.nl

--- Comment #8 from Peter Wu <peter at lekensteyn.nl> ---
Pablo, the issues that bbswitch has is different from the one reported here.
bbswitch is not updated for 4.8 requiring the pcie_port_pm=off workaround.

There are more details for this bug from the reporter in IRC (search for
NanoSector):
https://people.freedesktop.org/~cbrill/dri-log/index.php?channel=nouveau&date=2016-10-22

In particular, Rick reported that the issue apparently also appears with older
kernels, including 4.3 to 4.8. This is significant and a surprising result
because kernel 4.8 plus pcie_port_pm=off (or the d3cold_allowed change) should
have the same result as 4.7 or before. Rick, can you re-test it with 4.7?

It also occurs to me that older kernels might not support your GPU, so be sure
to keep a dmesg around.

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