[Bug 198907] Backlight control missing with /sys/class/backlight/ empty

[Bug 198907] Backlight control missing with /sys/class/backlight/ empty

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=198907

Zhang Rui (rui.zhang@intel.com) changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |rui.zhang@intel.com
          Component|Power-Video                 |Video(DRI - non Intel)
           Assignee|acpi_power-video@kernel-bug |drivers_video-dri@kernel-bu
                   |s.osdl.org                  |gs.osdl.org
            Product|ACPI                        |Drivers

--- Comment #1 from Zhang Rui (rui.zhang@intel.com) ---
reassign to the graphics experts

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[Bug 198907] Backlight control missing with /sys/class/backlight/ empty

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=198907

--- Comment #2 from Jani Nikula (jani.nikula@intel.com) ---
Please attach dmesg with drm.debug=14 added.

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[Bug 198907] Backlight control missing with /sys/class/backlight/ empty

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=198907

--- Comment #3 from Andrew (aun.sokolov@gmail.com) ---
Created attachment 274865
  --> https://bugzilla.kernel.org/attachment.cgi?id=274865&action=edit
dmesg with drm.debug=14 added

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[Bug 198907] Backlight control missing with /sys/class/backlight/ empty

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=198907

--- Comment #4 from Andrew (aun.sokolov@gmail.com) ---
(In reply to Jani Nikula from comment #2)
> Please attach dmesg with drm.debug=14 added.

done

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[Bug 198907] Backlight control missing with /sys/class/backlight/ empty

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=198907

--- Comment #5 from Jani Nikula (jani.nikula@intel.com) ---
[    6.112689] nvidia: loading out-of-tree module taints kernel.
[    6.112708] nvidia: module license 'NVIDIA' taints kernel.

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[Bug 198907] Backlight control missing with /sys/class/backlight/ empty

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=198907

Manuel (m.linsmayer@expersite.com) changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |m.linsmayer@expersite.com

--- Comment #6 from Manuel (m.linsmayer@expersite.com) ---
Hello!

I have a very similar situation, in my opinion. I'm running kernel 4.15.0-20,
my distro is Kubuntu 18.04, my hardware is a Dell XPS 15 9560 running with
latest firmware (1.9.4) in UEFI mode.

/sys/class/backlight is also empty for me. I have an Intel 591B as well as an
discrete NVIDIA GeForce GTX 1050. Situation is the same, no matter whether I'm
using Intel or NVIDIA graphics.

I'm also getting ACPI errors at startup.

[    0.000000] ACPI: Core revision 20170831
[    0.000000] ACPI Error: [\_SB_.PCI0.XHC_.RHUB.HS11] Namespace lookup
failure, AE_NOT_FOUND (20170831/dswload-210)
[    0.000000] ACPI Exception: AE_NOT_FOUND, During name lookup/catalog
(20170831/psobject-252)
[    0.000000] ACPI Exception: AE_NOT_FOUND, (SSDT:xh_rvp11) while loading
table (20170831/tbxfload-228)
[    0.000000] ACPI Error: 1 table load failures, 12 successful
(20170831/tbxfload-246)

I'm able to see ACPI events when pressing brightness down/up buttons:

 9DBB5994-A997-11� 000000d0 00000000
video/brightnessdown BRTDN 00000087 00000000 K
 9DBB5994-A997-11� 000000d0 00000000
video/brightnessup BRTUP 00000086 00000000 K

I played around with acpi_osi and acpi_backlight, but this doesn't change
anything.

Manuel

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[Bug 198907] Backlight control missing with /sys/class/backlight/ empty

[bugzilla-daemon]

https://bugzilla.kernel.org/show_bug.cgi?id=198907

Jani Nikula (jani.nikula@intel.com) changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
         Resolution|---                         |OBSOLETE

--- Comment #7 from Jani Nikula (jani.nikula@intel.com) ---
Closing this ancient bug. Please file a new bug at
https://gitlab.freedesktop.org/drm/intel/wikis/How-to-file-i915-bugs if still
relevant.

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