[Nouveau] HP Zbook17 Dock and UEFI conflict with GK107GLM aka Quadro K1100M

[Phil Turmel]

On 02/02/2017 04:48 PM, Ilia Mirkin wrote:
> On Thu, Feb 2, 2017 at 4:43 PM, Phil Turmel <philip at turmel.org> wrote:
>> On 02/01/2017 10:40 AM, Phil Turmel wrote:
>>> Hi All,
>>>
>>> I've been running Gentoo on a ZBook with great success for a couple years,
>>> but I've been stymied in my attempts to implement SecureBoot by an
>>> apparent problem with efifb to nouveaufb handoff, but only when external
>>> monitors are attached.  The handoff works without issue when the BIOS is
>>> in Mixed EFI mode, with and without external monitors, and
>>> works in Native EFI mode without external monitors.
>>
>> Sorted by nouveau.config=NvForcePost=1
> 
> Bleh. That's unfortunate. Presumably in "Native EFI" mode, displays
> work fine with efifb until nouveau takes over?

Yes, at least the laptop's built-in display.  The external displays
aren't activated in the brief time between efifb startup (penguins)
and handoff to nouveaufb.

> There was a time when the blob did *something* weird which defeated
> nouveau's display logic (when flipping between the two drivers).
> Perhaps this Native EFI mode does something along those lines as well.
> (Although in those cases, running the VBIOS didn't help... although
> each VBIOS is a unique snowflake. In some other cases, double-running
> the VBIOS leads to a hung GPU. Urgh.)

I'm open to experiments.  I've moved to vanilla 4.8.17 from 4.8.15 and
will jump into 4.9.x this weekend.  I'll check with and without
NvForcePost as I upgrade.  Not gonna hold my breath, though -- I first
noticed this a couple years ago and it hasn't been a priority.

But note, the handoff *does* work without NvForcePost if there are no
external monitors.  That's what's had me scratching my head.

Phil