[Nouveau] [Bug 86537] [NV96] Unable to handle page request from nv50_crtc_(prepare, disable) on dual Nvidia setup

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=86537

Pierre Moreau <pierre.morrow at free.fr> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |REOPENED
         Resolution|DUPLICATE                   |---
            Summary|[NV96] Unable to handle     |[NV96] Unable to handle
                   |page request from           |page request from
                   |nv50_crtc_prepare           |nv50_crtc_(prepare,disable)
                   |                            |on dual Nvidia setup

--- Comment #8 from Pierre Moreau <pierre.morrow at free.fr> ---
Reopening this bug as its core issue is different from the other bug's one.

Setting the 8 LSB of register 0x8841c (PPCI.CONFIG) to 0 makes it possible to
interact with the card normally, without any crashes. Though after powering off
the G96, switching to it from the MCP79 will result in a blank screen: no error
message outputed, no hang, just a blank screen. I'll push a hacky patch for
those who wants to use their G96, or power it down; you may alternatively run
`nvapoke -c0 0x8841c 28400` **before** loading Nouveau.

This bit resetting is also done by the PCI reset step.

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