https://bugs.kde.org/show_bug.cgi?id=490845
Rafal <rafalkozlowsk...@gmail.com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEEDSINFO |REPORTED
Resolution|WAITINGFORINFO |---
--- Comment #4 from Rafal <rafalkozlowsk...@gmail.com> ---
Tested with 6.1.4 today. The same behaviour after waking up session.
(In reply to Jakob Petsovits from comment #1)
> (In reply to Rafal from comment #0)
> > Some sessions occur problem with changing screen brightness. First
> > change(click on bar or scroll up/down on tray icon) works but then any
> > attempts not working.
> > In journal logs i can see:
> > error setting brightness via dbus
> > QDBusError("org.freedesktop.DBus.Error.UnknownObject", "No such object path
> > '/org/kde/Solid/PowerManagement/Actions/BrightnessControl'")
>
> Thanks for the report and screen recording. If the BrightnessControl D-Bus
> interface is missing, I can think of two possible reasons:
>
> (a) PowerDevil crashed, which is unfortunately something that happens in
> 6.1.2 and 6.1.3 when waking up from inactivity and will only be fixed with
> 6.1.4. Have a look with `coredumpctl --reverse` to see if a powerdevil
> process recently produced a coredump after a crash. That would be Bug 490356.
No recent powerdevil crashes.
> (b) ddcutil lost track of the monitor, so PowerDevil removed its brightness
> controls and the applet didn't recognize the disappearance of the
> BrightnessControl interface. That would be Bug 482713. Have a look with
> `ddcutil detect` whether your monitor is still recognized by ddcutil at all
> - it happened to me recently that this would stop working until a reboot.
seems like ddcutil still can comunicate
Display 1
I2C bus: /dev/i2c-6
DRM connector: card1-DP-1
EDID synopsis:
Mfg id: IVM - Iiyama North America
Model: PLG2788H
Product code: 26151 (0x6627)
Serial number: 0
Binary serial number: 16843009 (0x01010101)
Manufacture year: 2016, Week: 0
VCP version: 2.1
Display 2
I2C bus: /dev/i2c-8
DRM connector: card1-DP-3
EDID synopsis:
Mfg id: IVM - Iiyama North America
Model: PLG2488H
Product code: 24871 (0x6127)
Serial number: 0
Binary serial number: 16843009 (0x01010101)
Manufacture year: 2016, Week: 0
DRM reports the monitor is in a DPMS sleep state (Off).
DRM reports the monitor is disabled.
DDC communication appears to work, but output is likely invalid.
VCP version: 2.1
(In reply to Jakob Petsovits from comment #2)
> (In reply to Rafal from comment #0)
> > Some sessions occur problem with changing screen brightness. First
> > change(click on bar or scroll up/down on tray icon) works but then any
> > attempts not working.
>
> Oh yeah, one more possible cause:
>
> (c) PowerDevil sends a brightness command to the monitor, but the command
> doesn't succeed so we remove it from the list of brightness controls. There
> was a recent MR at
> https://invent.kde.org/plasma/powerdevil/-/merge_requests/393 which improved
> this by delaying the command a little bit, that patch made it into 6.1.3.
> Given that your bug report is for 6.1.3, I'm guessing that the cause of your
> issue is a different one, but it's still possible that a permanently failing
> brightness write command will get the monitor removed from brightness
> controls. If this happens, you would see warning messages (likely about
> "ddca_set_non_table_vcp_value") in your system log, i.e. `journalctl -S
> today` for example.
I do not see such thing. About ddc only
> org_kde_powerdevil[2605]: org.kde.powerdevil: [DDCutilDisplay]:
> ddca_open_display2 -3030
after waking up probably. But it is just info log. There is more about
pulseaudio but i do not think it may be related with this
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