linux-kernel - Re: Kernel Freeze with American Megatrends BIOS

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Date:   Wed, 31 Aug 2016 12:51:59 +0200
From:   Roland Singer <roland.singer@...ertbit.com>
To:     Emil Velikov <emil.l.velikov@...il.com>
Cc:     Bjorn Helgaas <helgaas@...nel.org>, linux-pci@...r.kernel.org,
        "Linux-Kernel@...r. Kernel. Org" <linux-kernel@...r.kernel.org>,
        ML dri-devel <dri-devel@...ts.freedesktop.org>,
        linux-acpi@...r.kernel.org, Ilia Mirkin <imirkin@...m.mit.edu>,
        peter@...ensteyn.nl
Subject: Re: Kernel Freeze with American Megatrends BIOS

Am 30.08.2016 um 20:09 schrieb Emil Velikov:
> I second Ilia here. Using bbswitch in conjunction with any driver (be
> that nouveau or the proprietary one) is a bad idea.
>

I removed bbswitch from my system and will use vgaswitcheroo to check
the GPU power state from now.

> (If Ilia's suggestions does not help) Confirm if the freeze is due
> to/as the GPU is powered on or off.
>

Yeah, the freeze is caused by the switched off GPU.
Waited for the nouveau driver to switch it off, before starting
the graphical user interface...

> Out of curiosity: how did you force X to ignore the device ?
>

I tried to tell X11 to ignore the device with the following
configuration:

  Section "Device"
      Identifier  "Nvidia"
      VendorName  "NVIDIA Corporation"
      Option      "Ignore" "true"
  EndSection

> You can check if it's the boot_vga assumption with
> cat /sys/class/drm/card*/device/{boot_vga,vendor}
> If the output changes them my assumption holds true.

Output did not change:

  1
  0x8086

0x8086 is the vendor ID of intel. So that's ok...