From: bugzilla-daemon@bugzilla.kernel.org
To: dri-devel@lists.freedesktop.org
Subject: [Bug 117131] vga_switcheroo does not switch IGP -> DIS ( IGP == i915 , DIS == radeon )
Date: Tue, 26 Apr 2016 22:11:05 +0000 [thread overview]
Message-ID: <bug-117131-2300-HH129SIDOV@https.bugzilla.kernel.org/> (raw)
In-Reply-To: <bug-117131-2300@https.bugzilla.kernel.org/>
https://bugzilla.kernel.org/show_bug.cgi?id=117131
--- Comment #24 from Alex Deucher <alexdeucher@gmail.com> ---
(In reply to Jason Vas Dias from comment #20)
> When I look at linux 4.5.0 boot dmesg log messages like :
>
> [ 3.115380] vga_switcheroo: enabled
> [ 3.115463] ATPX version 1, functions 0x00000033
> [ 3.115541] [drm] DMAR active, disabling use of stolen memory
>
>
> I think 'you lie, Linux' !
The driver reads the supported ATPX functions from ACPI. So it's a bios bug.
>
> vga_switcheroo can never be enabled on this platform because
> it has no MUX , and the logs above show the quality of the
> ACPI ATPX support.
>
vga_switcheroo and ATPX are used on muxed and mux-less platforms to powerdown
the dGPU dynamically when it's not in use.
The ATPX error messages are harmless though as they are not checked anywhere.
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next prev parent reply other threads:[~2016-04-26 22:11 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-04-24 19:17 [Bug 117131] New: vga_switcheroo does not switch IGP -> DIS ( IGP == i915 , DIS == radeon ) bugzilla-daemon
2016-04-24 19:28 ` [Bug 117131] " bugzilla-daemon
2016-04-24 19:46 ` bugzilla-daemon
2016-04-24 20:30 ` bugzilla-daemon
2016-04-24 20:44 ` bugzilla-daemon
2016-04-24 23:21 ` bugzilla-daemon
2016-04-25 13:58 ` bugzilla-daemon
2016-04-25 17:43 ` bugzilla-daemon
2016-04-25 17:49 ` bugzilla-daemon
2016-04-25 17:59 ` bugzilla-daemon
2016-04-25 18:49 ` bugzilla-daemon
2016-04-25 19:02 ` bugzilla-daemon
2016-04-25 19:25 ` bugzilla-daemon
2016-04-25 19:39 ` bugzilla-daemon
2016-04-25 20:19 ` bugzilla-daemon
2016-04-25 20:48 ` bugzilla-daemon
2016-04-25 20:51 ` bugzilla-daemon
2016-04-26 0:43 ` bugzilla-daemon
2016-04-26 15:26 ` bugzilla-daemon
2016-04-26 15:52 ` bugzilla-daemon
2016-04-26 16:55 ` bugzilla-daemon
2016-04-26 18:37 ` bugzilla-daemon
2016-04-26 18:38 ` bugzilla-daemon
2016-04-26 18:50 ` bugzilla-daemon
2016-04-26 22:11 ` bugzilla-daemon [this message]
2016-04-26 22:16 ` bugzilla-daemon
2016-04-26 22:20 ` bugzilla-daemon
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