[Bug 115011] [drm:radeon_acpi_init [radeon]] *ERROR* Cannot find a backlight controller

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=115011

Luya Tshimbalanga <luya at fedoraproject.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|ASSIGNED                    |RESOLVED
         Resolution|---                         |PATCH_ALREADY_AVAILABLE

--- Comment #13 from Luya Tshimbalanga <luya at 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 at 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 at 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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