[Bug 99881] Lockup/Freezes on Laptop with switchable graphics

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=99881

--- Comment #30 from Matthew Fox <matthew at tech3.me> ---
Just to confirm, the freezes and hard lockups still occur and the corresponding
messages in dmesg which I also attached.

This may be more sound related but I previously found in the kernel source
(file http://lxr.free-electrons.com/source/sound/pci/hda/hda_intel.c?v=4.8):

1182 static int register_vga_switcheroo(struct azx *chip)
1183 {
1184         struct hda_intel *hda = container_of(chip, struct hda_intel,
chip);
1185         int err;
1186 
1187         if (!hda->use_vga_switcheroo)
1188                 return 0;
1189         /* FIXME: currently only handling DIS controller
1190          * is there any machine with two switchable HDMI audio
controllers?
1191          */
1192         err = vga_switcheroo_register_audio_client(chip->pci, &azx_vs_ops,
1193                                                    VGA_SWITCHEROO_DIS);
1194         if (err < 0)
1195                 return err;
1196         hda->vga_switcheroo_registered = 1;
1197 
1198         /* register as an optimus hdmi audio power domain */
1199         vga_switcheroo_init_domain_pm_optimus_hdmi_audio(chip->card->dev,
1200                                                         
&hda->hdmi_pm_domain);
1201         return 0;
1202 } 

In dmesg, these lines always appear along with the gpu init lines:

snd_hda_intel 0000:02:00.1: Enabling via vga_switcheroo
snd_hda_intel 0000:02:00.1: CORB reset timeout#2, CORBRP = 65535
snd_hda_intel 0000:02:00.1: Disabling via vga_switcheroo
snd_hda_intel 0000:02:00.1: Cannot lock devices!

'CORB reset timeout#2, CORBRP = 65535' appears red in dmesg and
'Cannot lock devices!' appears white in dmesg.

0000:02:00.1 is the Discrete audio attached to the discrete GPU (the discrete
GPU is 02:00.0)

>From lspci, there's another audio device:
00:14.2 Audio device [0403]: Advanced Micro Devices, Inc. [AMD/ATI] SBx00
Azalia (Intel HDA) [1002:4383] (rev 40)

Now in the function above, it says '...is there any machine with two switchable
HDMI audio controllers?' - I wonder if that's the case here? Which might be
causing problems and the associated sound messages in dmesg?

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