[systemd-bugs] [Bug 81884] New: [regression] save/restore screen backlight brightness fails after xorg update

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=81884

          Priority: medium
            Bug ID: 81884
          Assignee: systemd-bugs at lists.freedesktop.org
           Summary: [regression] save/restore screen backlight brightness
                    fails after xorg update
        QA Contact: systemd-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: All
          Reporter: mike.cloaked at gmail.com
          Hardware: Other
            Status: NEW
           Version: unspecified
         Component: general
           Product: systemd

After update to xorg server 1.16 in arch linux on Thinkpad S540 the brightness
that was previously being set normally on boot and shutdown is now extremely
dim.

The screen remains dim to the KDM login greeter but is restored to sensible
levels by KDE once logged in. On shutdown after leaving KDE the screen is again
very dim and nearly unreadable.

Brightness values when logged in to KDE are:

$ ls -1 /sys/class/backlight/intel_backlight/*brightness | xargs -I % sh -c
"echo % ; cat %"
/sys/class/backlight/intel_backlight/actual_brightness
937
/sys/class/backlight/intel_backlight/brightness
937
/sys/class/backlight/intel_backlight/max_brightness
937
$ ls -1 /sys/class/backlight/acpi_video0/*brightness | xargs -I % sh -c "echo %
; cat %"
/sys/class/backlight/acpi_video0/actual_brightness
100
/sys/class/backlight/acpi_video0/brightness
100
/sys/class/backlight/acpi_video0/max_brightness
100

However the journal log shows the likely problem:
Jul 29 17:56:28 lenovo1 systemd[1]: Created slice
system-systemd\x2dbacklight.slice.
Jul 29 17:56:28 lenovo1 systemd[1]: Starting Load/Save Screen Backlight
Brightness of backlight:acpi_video0...
Jul 29 17:56:28 lenovo1 kernel: thinkpad_acpi: ThinkPad ACPI Extras v0.25
Jul 29 17:56:28 lenovo1 kernel: thinkpad_acpi: http://ibm-acpi.sf.net/
Jul 29 17:56:28 lenovo1 kernel: thinkpad_acpi: ThinkPad BIOS GPET58WW (1.58 ),
EC unknown
Jul 29 17:56:28 lenovo1 kernel: thinkpad_acpi: Lenovo ThinkPad S5-S540, model
20B3CTO1WW
Jul 29 17:56:28 lenovo1 systemd[1]: Starting Load/Save Screen Backlight
Brightness of backlight:intel_backlight...
Jul 29 17:56:28 lenovo1 kernel: snd_hda_intel 0000:00:1b.0: irq 61 for
MSI/MSI-X
Jul 29 17:56:28 lenovo1 kernel: tpm_tis 00:0b: 1.2 TPM (device-id 0x0, rev-id
78)
Jul 29 17:56:28 lenovo1 kernel: ACPI Error: [\_SB_.PCI0.GFX0.DD02._BCL]
Namespace lookup failure, AE_NOT_FOUND (20
Jul 29 17:56:28 lenovo1 kernel: ACPI Error: Method parse/execution failed
[\_SB_.PCI0.RP05.PEGP.DD02._BCL] (Node f
Jul 29 17:56:28 lenovo1 kernel: thinkpad_acpi: detected a 8-level brightness
capable ThinkPad
Jul 29 17:56:28 lenovo1 kernel: thinkpad_acpi: This ThinkPad has standard ACPI
backlight brightness control, suppo
Jul 29 17:56:28 lenovo1 kernel: thinkpad_acpi: Disabling thinkpad-acpi
brightness events by default...
Jul 29 17:56:28 lenovo1 systemd-backlight[200]: Saved brightness 11 too low;
increasing to 46.
Jul 29 17:56:28 lenovo1 kernel: snd_hda_intel 0000:00:03.0: irq 62 for
MSI/MSI-X
Jul 29 17:56:28 lenovo1 kernel: ACPI Exception: AE_BAD_PARAMETER, Returned by
Handler for [EmbeddedControl] (20140
Jul 29 17:56:28 lenovo1 kernel: ACPI Error: Method parse/execution failed
[\_TZ_.TZ01._TMP] (Node ffff880226839cd0
Jul 29 17:56:28 lenovo1 kernel: ACPI Exception: AE_BAD_PARAMETER, Returned by
Handler for [EmbeddedControl] (20140
Jul 29 17:56:28 lenovo1 kernel: ACPI Error: Method parse/execution failed
[\_TZ_.TZ01._TMP] (Node ffff880226839cd0
Jul 29 17:56:28 lenovo1 systemd[1]: Started Load/Save Screen Backlight
Brightness of backlight:acpi_video0.
Jul 29 17:56:28 lenovo1 systemd[1]: Started Load/Save Screen Backlight
Brightness of backlight:intel_backlight.

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