[Bug 79699] New: XRandr backlight notifications are lost

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=79699

          Priority: medium
            Bug ID: 79699
          Assignee: chris at chris-wilson.co.uk
           Summary: XRandr backlight notifications are lost
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
          Severity: normal
    Classification: Unclassified
                OS: Linux (All)
          Reporter: mezin.alexander at gmail.com
          Hardware: Other
            Status: NEW
           Version: git
         Component: Driver/intel
           Product: xorg

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

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