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<base href="https://bugs.freedesktop.org/" />
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<body><table border="1" cellspacing="0" cellpadding="8">
<tr>
<th>Priority</th>
<td>medium
</td>
</tr>
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - [regression] save/restore screen backlight brightness fails after xorg update"
href="https://bugs.freedesktop.org/show_bug.cgi?id=81884">81884</a>
</td>
</tr>
<tr>
<th>Assignee</th>
<td>systemd-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>Summary</th>
<td>[regression] save/restore screen backlight brightness fails after xorg update
</td>
</tr>
<tr>
<th>QA Contact</th>
<td>systemd-bugs@lists.freedesktop.org
</td>
</tr>
<tr>
<th>Severity</th>
<td>normal
</td>
</tr>
<tr>
<th>Classification</th>
<td>Unclassified
</td>
</tr>
<tr>
<th>OS</th>
<td>All
</td>
</tr>
<tr>
<th>Reporter</th>
<td>mike.cloaked@gmail.com
</td>
</tr>
<tr>
<th>Hardware</th>
<td>Other
</td>
</tr>
<tr>
<th>Status</th>
<td>NEW
</td>
</tr>
<tr>
<th>Version</th>
<td>unspecified
</td>
</tr>
<tr>
<th>Component</th>
<td>general
</td>
</tr>
<tr>
<th>Product</th>
<td>systemd
</td>
</tr></table>
<p>
<div>
<pre>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: <a href="http://ibm-acpi.sf.net/">http://ibm-acpi.sf.net/</a>
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.</pre>
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