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From: Ilia Mirkin <imirkin@alum.mit.edu>
To: Roland Singer <roland.singer@desertbit.com>
Cc: Emil Velikov <emil.l.velikov@gmail.com>,
	Bjorn Helgaas <helgaas@kernel.org>,
	Linux PCI <linux-pci@vger.kernel.org>,
	"Linux-Kernel@Vger. Kernel. Org" <linux-kernel@vger.kernel.org>,
	ML dri-devel <dri-devel@lists.freedesktop.org>,
	"linux-acpi@vger.kernel.org" <linux-acpi@vger.kernel.org>
Subject: Re: Kernel Freeze with American Megatrends BIOS
Date: Tue, 30 Aug 2016 11:44:38 -0400	[thread overview]
Message-ID: <CAKb7UvhyCVoFXYL74eX3rXtt=V7nOnBGaTPVdcJT37v38jD8oQ@mail.gmail.com> (raw)
In-Reply-To: <735da66c-aaf3-8c27-2d59-f62e8c85d3aa@desertbit.com>

On Tue, Aug 30, 2016 at 11:25 AM, Roland Singer
<roland.singer@desertbit.com> wrote:
> I tried these scenarios:
>
> 1. Booted the system without the bbswitch module. The nouveau module
>    was loaded and is responsible for the power management of the GPU.
>    The graphical session freezes after some minutes...
>
> 2. Booted the system without bbswitch and with nouveau blacklisted.
>    Manually loaded bbswitch to switch off the discrete GPU.
>    Same freeze after a while or by explicitly obtaining the GPU state.
>
> Is there a possibility to switch off the discrete card without bbswitch?
> If this is possible, then I could test this without nouveau and bbswitch
> at all. If the system hangs, then it is not the video driver nor bbswitch.

You can use acpi_call (a random search points to
https://github.com/mkottman/acpi_call, but I don't know if that's the
"official" version) - need to find the right method to call, but
that's basically all it takes to acpi-suspend a gpu.

Separately, there was a recent fix to ... something, including but not
limited to nouveau, involving hangs on gpu suspend on newer laptops. I
don't think it's upstream yet. Look for patches from Lukas Wunner.

  -ilia

  reply	other threads:[~2016-08-30 15:44 UTC|newest]

Thread overview: 39+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2016-08-23  9:23 Kernel Freeze with American Megatrends BIOS Roland Singer
2016-08-29  7:56 ` Roland Singer
2016-08-29 16:02 ` Bjorn Helgaas
2016-08-29 18:46   ` Roland Singer
2016-08-29 19:07     ` Bjorn Helgaas
2016-08-29 19:55       ` Roland Singer
2016-08-29 23:54         ` Bjorn Helgaas
2016-08-30 10:08           ` Roland Singer
2016-08-30 13:06             ` Bjorn Helgaas
2016-08-30 14:08               ` Emil Velikov
2016-08-30 14:08                 ` Emil Velikov
2016-08-30 15:25                 ` Roland Singer
2016-08-30 15:44                   ` Ilia Mirkin [this message]
2016-08-30 15:48                     ` Ilia Mirkin
2016-08-30 15:48                   ` Emil Velikov
2016-08-30 17:37                     ` Roland Singer
2016-08-30 17:43                       ` Ilia Mirkin
2016-08-30 17:43                         ` Ilia Mirkin
2016-08-30 18:02                         ` Roland Singer
2016-08-30 18:13                           ` Ilia Mirkin
2016-08-30 18:13                             ` Ilia Mirkin
2016-08-30 19:21                             ` Peter Wu
2016-08-31 11:12                               ` Roland Singer
2016-08-31 11:11                             ` Roland Singer
2016-08-30 18:09                       ` Emil Velikov
2016-08-30 18:09                         ` Emil Velikov
2016-08-30 18:10                         ` Emil Velikov
2016-08-30 18:10                           ` Emil Velikov
2016-08-31 10:51                           ` Roland Singer
2016-08-30 19:53   ` Peter Wu
2016-08-30 19:53     ` Peter Wu
2016-08-31 11:27     ` Roland Singer
2016-08-31 11:46       ` Peter Wu
2016-08-31 11:46         ` Peter Wu
2016-08-31 12:21         ` Roland Singer
2016-08-31 12:34           ` Peter Wu
2016-08-31 13:13             ` Roland Singer
2016-08-31 20:06               ` Roland Singer
2016-08-31 20:16                 ` Roland Singer

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