[Bug 94725] Nouveau driver fails to poweron GPU on GM204 after dynamic poweroff - bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ

From: bugzilla-daemon-CC+yJ3UmIYqDUpFQwHEjaQ@public.gmane.org
To: nouveau-PD4FTy7X32lNgt0PjOBp9y5qC8QIuHrW@public.gmane.org
Subject: [Bug 94725] Nouveau driver fails to poweron GPU on GM204 after dynamic poweroff
Date: Fri, 01 Apr 2016 15:17:34 +0000	[thread overview]
Message-ID: <bug-94725-8800-0111GoOQVN@http.bugs.freedesktop.org/> (raw)
In-Reply-To: <bug-94725-8800-V0hAGp6uBxMKqLRl/0Ahz6D7qz1kEfGD2LY78lusg7I@public.gmane.org/>

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https://bugs.freedesktop.org/show_bug.cgi?id=94725

--- Comment #13 from Karol Herbst <freedesktop-lIBOoy2+GI7scQ4cX5LuPg@public.gmane.org> ---
(In reply to Rashed Abdel-Tawab from comment #10)
> Created attachment 122654 [details]
> dmesg using tentative fix
> 
> Alexandre, using the tentative fix you uploaded it switches GPUs properly
> now. Here is the dmesg from that since there are still some errors related
> to power state in it. Also, for some reason lshw is returning this for the
> nVidia GPU now:
> 
> *-generic
>                 description: Unassigned class
>                 product: Illegal Vendor ID
>                 vendor: Illegal Vendor ID
>                 physical id: 0
>                 bus info: pci@0000:01:00.0
>                 version: ff
>                 width: 32 bits
>                 clock: 66MHz
>                 capabilities: bus_master vga_palette cap_list rom
>                 configuration: driver=nouveau latency=255 maxlatency=255
> mingnt=255
>                 resources: irq:129 memory:dc000000-dcffffff
> memory:b0000000-bfffffff memory:c0000000-c1ffffff ioport:e000(size=128)
> memory:dd000000-dd07ffff
> 
> I don't know if that's related to this at all but before, if I set runpm=0
> and run lshw, it would return the proper description (running it without
> runpm would cause the system to hang)

I have the same issue with bbswitch (and maybe vgaswitcheroo too). Basically
this means that in d3cold we can't talke to the gpu and the information isn't
cached or something like that.

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