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<base href="https://bugs.freedesktop.org/" />
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<body><table border="1" cellspacing="0" cellpadding="8">
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<th>Priority</th>
<td>medium
</td>
</tr>
<tr>
<th>Bug ID</th>
<td><a class="bz_bug_link
bz_status_NEW "
title="NEW --- - XRandr backlight notifications are lost"
href="https://bugs.freedesktop.org/show_bug.cgi?id=79699">79699</a>
</td>
</tr>
<tr>
<th>Assignee</th>
<td>chris@chris-wilson.co.uk
</td>
</tr>
<tr>
<th>Summary</th>
<td>XRandr backlight notifications are lost
</td>
</tr>
<tr>
<th>QA Contact</th>
<td>intel-gfx-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>Linux (All)
</td>
</tr>
<tr>
<th>Reporter</th>
<td>mezin.alexander@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>git
</td>
</tr>
<tr>
<th>Component</th>
<td>Driver/intel
</td>
</tr>
<tr>
<th>Product</th>
<td>xorg
</td>
</tr></table>
<p>
<div>
<pre>When I press "brightness up" or "brightness down" keys, backlight brightness
changes. But KDE power manager thinks backlight didn't change.
udevadm --monitor:
KERNEL[280.185564] change
/devices/pci0000:00/0000:00:02.0/backlight/acpi_video0 (backlight)
UDEV [280.187550] change
/devices/pci0000:00/0000:00:02.0/backlight/acpi_video0 (backlight)
KERNEL[280.431646] change
/devices/pci0000:00/0000:00:02.0/backlight/acpi_video0 (backlight)
UDEV [280.432869] change
/devices/pci0000:00/0000:00:02.0/backlight/acpi_video0 (backlight)
KERNEL[280.462208] change
/devices/pci0000:00/0000:00:02.0/backlight/acpi_video0 (backlight)
UDEV [280.462858] change
/devices/pci0000:00/0000:00:02.0/backlight/acpi_video0 (backlight)
KERNEL[280.492426] change
/devices/pci0000:00/0000:00:02.0/backlight/acpi_video0 (backlight)
UDEV [280.494159] change
/devices/pci0000:00/0000:00:02.0/backlight/acpi_video0 (backlight)
.....
acpi_listen:
video/brightnessup BRTUP 00000086 00000000
video/brightnessup BRTUP 00000086 00000000
video/brightnessup BRTUP 00000086 00000000
PNP0C14:00 000000bc 00000000
PNP0C14:00 000000bc 00000000
video/brightnessup BRTUP 00000086 00000000
PNP0C14:00 000000bc 00000000
PNP0C14:00 000000bc 00000000
PNP0C14:00 000000bc 00000000
video/brightnessup BRTUP 00000086 00000000
.......
Sometimes randr notification is triggered, but it happens at random time and
very infrequently.
xev:
RRNotify event, serial 52, synthetic NO, window 0x4800001,
subtype XRROutputPropertyChangeNotifyEvent
output eDP1, property Backlight, timestamp 524659, state NewValue
only single notification for ~50 keypresses
I have xf86-video-git built from git master using SNA backend</pre>
</div>
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