* [Bug 115011] [drm:radeon_acpi_init [radeon]] *ERROR* Cannot find a backlight controller
[not found] <bug-115011-2300@https.bugzilla.kernel.org/>
@ 2016-03-28 23:32 ` bugzilla-daemon
2016-03-29 14:16 ` bugzilla-daemon
` (6 subsequent siblings)
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From: bugzilla-daemon @ 2016-03-28 23:32 UTC (permalink / raw)
To: dri-devel
https://bugzilla.kernel.org/show_bug.cgi?id=115011
Zhang Rui <rui.zhang@intel.com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |rui.zhang@intel.com
Component|ACPICA-Core |Video(DRI - non Intel)
Assignee|aaron.lu@intel.com |drivers_video-dri@kernel-bu
| |gs.osdl.org
Product|ACPI |Drivers
--- Comment #9 from Zhang Rui <rui.zhang@intel.com> ---
Reassign to graphics experts.
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* [Bug 115011] [drm:radeon_acpi_init [radeon]] *ERROR* Cannot find a backlight controller
[not found] <bug-115011-2300@https.bugzilla.kernel.org/>
2016-03-28 23:32 ` [Bug 115011] [drm:radeon_acpi_init [radeon]] *ERROR* Cannot find a backlight controller bugzilla-daemon
@ 2016-03-29 14:16 ` bugzilla-daemon
2016-03-29 17:30 ` bugzilla-daemon
` (5 subsequent siblings)
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From: bugzilla-daemon @ 2016-03-29 14:16 UTC (permalink / raw)
To: dri-devel
https://bugzilla.kernel.org/show_bug.cgi?id=115011
Alex Deucher <alexdeucher@gmail.com> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |alexdeucher@gmail.com
--- Comment #10 from Alex Deucher <alexdeucher@gmail.com> ---
(In reply to Luya Tshimbalanga from comment #7)
> Created attachment 210281 [details]
> dmesg with 4.6.0-0.rc0.git13.1
>
> dmesg report using latest git kernel i.e. 4.6.0-0. Same result:
>
> [ 7.498283] [drm:radeon_acpi_init [radeon]] *ERROR* Cannot find a
> backlight controller
This message is harmless. Your laptop has two GPUs. The ATIF ACPI method is
used to notify the driver of backlight change events so the driver checks to
see if it exists. Depending on the board configuration, the secondary GPU may
or may not have access to the backlight controller. In this case it does not.
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* [Bug 115011] [drm:radeon_acpi_init [radeon]] *ERROR* Cannot find a backlight controller
[not found] <bug-115011-2300@https.bugzilla.kernel.org/>
2016-03-28 23:32 ` [Bug 115011] [drm:radeon_acpi_init [radeon]] *ERROR* Cannot find a backlight controller bugzilla-daemon
2016-03-29 14:16 ` bugzilla-daemon
@ 2016-03-29 17:30 ` bugzilla-daemon
2016-07-14 10:30 ` bugzilla-daemon
` (4 subsequent siblings)
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From: bugzilla-daemon @ 2016-03-29 17:30 UTC (permalink / raw)
To: dri-devel
https://bugzilla.kernel.org/show_bug.cgi?id=115011
--- Comment #11 from Luya Tshimbalanga <luya@fedoraproject.org> ---
(In reply to Alex Deucher from comment #10)
> (In reply to Luya Tshimbalanga from comment #7)
> > Created attachment 210281 [details]
> > dmesg with 4.6.0-0.rc0.git13.1
> >
> > dmesg report using latest git kernel i.e. 4.6.0-0. Same result:
> >
> > [ 7.498283] [drm:radeon_acpi_init [radeon]] *ERROR* Cannot find a
> > backlight controller
>
> This message is harmless. Your laptop has two GPUs. The ATIF ACPI method
> is used to notify the driver of backlight change events so the driver checks
> to see if it exists. Depending on the board configuration, the secondary
> GPU may or may not have access to the backlight controller. In this case it
> does not.
Thank you for explaining the meaning of the message related to dual GPUs. It
will be nice to improve the mechanism where one of GPU cannot access to the
backlight controller.
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* [Bug 115011] [drm:radeon_acpi_init [radeon]] *ERROR* Cannot find a backlight controller
[not found] <bug-115011-2300@https.bugzilla.kernel.org/>
` (2 preceding siblings ...)
2016-03-29 17:30 ` bugzilla-daemon
@ 2016-07-14 10:30 ` bugzilla-daemon
2016-09-13 5:08 ` bugzilla-daemon
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From: bugzilla-daemon @ 2016-07-14 10:30 UTC (permalink / raw)
To: dri-devel
https://bugzilla.kernel.org/show_bug.cgi?id=115011
Hans de Goede <jwrdegoede@fedoraproject.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |jwrdegoede@fedoraproject.or
| |g
--- Comment #12 from Hans de Goede <jwrdegoede@fedoraproject.org> ---
Hi Alex,
(In reply to Alex Deucher from comment #10)
> (In reply to Luya Tshimbalanga from comment #7)
> > Created attachment 210281 [details]
> > dmesg with 4.6.0-0.rc0.git13.1
> >
> > dmesg report using latest git kernel i.e. 4.6.0-0. Same result:
> >
> > [ 7.498283] [drm:radeon_acpi_init [radeon]] *ERROR* Cannot find a
> > backlight controller
>
> This message is harmless. Your laptop has two GPUs. The ATIF ACPI method
> is used to notify the driver of backlight change events so the driver checks
> to see if it exists. Depending on the board configuration, the secondary
> GPU may or may not have access to the backlight controller. In this case it
> does not.
Mayebe we need to make the error a bit less scary then, e.g. :
[drm:radeon_acpi_init [radeon]] *Warning* Cannot find a backlight controller,
this is ussualy harmless on dual gpu systems
Yes it is a bit long, but it will likely help to avoid future bug reports about
this.
Regards,
Hans
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* [Bug 115011] [drm:radeon_acpi_init [radeon]] *ERROR* Cannot find a backlight controller
[not found] <bug-115011-2300@https.bugzilla.kernel.org/>
` (3 preceding siblings ...)
2016-07-14 10:30 ` bugzilla-daemon
@ 2016-09-13 5:08 ` bugzilla-daemon
2016-09-13 5:13 ` bugzilla-daemon
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From: bugzilla-daemon @ 2016-09-13 5:08 UTC (permalink / raw)
To: dri-devel
https://bugzilla.kernel.org/show_bug.cgi?id=115011
Luya Tshimbalanga <luya@fedoraproject.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution|--- |PATCH_ALREADY_AVAILABLE
--- Comment #13 from Luya Tshimbalanga <luya@fedoraproject.org> ---
Hello,
I am closing this bug report now it was revealed the bug was triggered by the
new ACPI EC scheme from the BIOS first used by Microsoft Windows 8.1 and up.
Tested with patch on Kernel 4.8 rc4 properly handle the backlight controller.
I no longer see the error message:
$ journalctl -b | grep backlight
Sep 12 09:42:22 muamba-telus1603 kernel: [drm] radeon atom DIG backlight
initialized
Sep 12 16:42:59 muamba-telus1603 kernel: audit: type=1130
audit(1473723759.682:64): pid=1 uid=0 auid=4294967295 ses=4294967295
subj=system_u:system_r:init_t:s0
msg='unit=systemd-backlight@backlight:radeon_bl0 comm="systemd"
exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'
Sep 12 16:42:39 muamba-telus1603 audit[1]: SERVICE_START pid=1 uid=0
auid=4294967295 ses=4294967295 subj=system_u:system_r:init_t:s0
msg='unit=systemd-backlight@backlight:radeon_bl0 comm="systemd"
exe="/usr/lib/systemd/systemd" hostname=? addr=? terminal=? res=success'
Sep 12 16:42:39 muamba-telus1603 systemd[1]: Created slice
system-systemd\x2dbacklight.slice.
Sep 12 16:42:39 muamba-telus1603 systemd[1]: Starting Load/Save Screen
Backlight Brightness of backlight:radeon_bl0...
Sep 12 16:42:39 muamba-telus1603 systemd[1]: Started Load/Save Screen Backlight
Brightness of backlight:radeon_bl0.
Thank you for the investigation and the effort.
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* [Bug 115011] [drm:radeon_acpi_init [radeon]] *ERROR* Cannot find a backlight controller
[not found] <bug-115011-2300@https.bugzilla.kernel.org/>
` (4 preceding siblings ...)
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@ 2016-09-13 5:13 ` bugzilla-daemon
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From: bugzilla-daemon @ 2016-09-13 5:13 UTC (permalink / raw)
To: dri-devel
https://bugzilla.kernel.org/show_bug.cgi?id=115011
--- Comment #14 from Alex Deucher <alexdeucher@gmail.com> ---
You aren't seeing the message because it was removed in newer kernels.
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* [Bug 115011] [drm:radeon_acpi_init [radeon]] *ERROR* Cannot find a backlight controller
[not found] <bug-115011-2300@https.bugzilla.kernel.org/>
` (5 preceding siblings ...)
2016-09-13 5:13 ` bugzilla-daemon
@ 2016-09-13 5:16 ` bugzilla-daemon
2016-09-13 5:21 ` bugzilla-daemon
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From: bugzilla-daemon @ 2016-09-13 5:16 UTC (permalink / raw)
To: dri-devel
https://bugzilla.kernel.org/show_bug.cgi?id=115011
--- Comment #15 from Luya Tshimbalanga <luya@fedoraproject.org> ---
(In reply to Alex Deucher from comment #14)
> You aren't seeing the message because it was removed in newer kernels.
Thank you for the clarification. Should I set the status as code fix then?
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* [Bug 115011] [drm:radeon_acpi_init [radeon]] *ERROR* Cannot find a backlight controller
[not found] <bug-115011-2300@https.bugzilla.kernel.org/>
` (6 preceding siblings ...)
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@ 2016-09-13 5:21 ` bugzilla-daemon
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From: bugzilla-daemon @ 2016-09-13 5:21 UTC (permalink / raw)
To: dri-devel
https://bugzilla.kernel.org/show_bug.cgi?id=115011
Luya Tshimbalanga <luya@fedoraproject.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Resolution|PATCH_ALREADY_AVAILABLE |CODE_FIX
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