https://bugs.kde.org/show_bug.cgi?id=428457
Bug ID: 428457
Summary: Plasma doesn't recognize unplugged battery
Product: Powerdevil
Version: 5.20.2
Platform: Other
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: general
Assignee: plasma-b...@kde.org
Reporter: s.r...@outlook.com
Target Milestone: ---
SUMMARY
The unplug events don't seem to be taking place when my laptop is unplugged
from AC power. The behavior appears to have started in 5.19 on Tumbleweed and
persists to now. However, I believe I have narrowed it down to something to do
with linux kernels < 5.7
For reference, I have a Lenovo X1 Carbon 6 and am using rolling distros.
STEPS TO REPRODUCE
1. Start laptop with power plugged in
2. Log in, use the computer as normal
3. Unplug the laptop
OBSERVED RESULT
A few things (don't) happen:
- The unplug sound doesn't play
- The battery icon moves from hidden to visible on the system tray
- However, despite moving, the indicator still shows a "Plugged in" icon
- The calculated time-remaining until full charge may be the time to discharge
(uncertain here)
EXPECTED RESULT
The laptop correctly identifies that it is no longer plugged in and changes
modes accordingly.
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: Arch latest linux (5.9.1), OpenSUSE Tumbleweed (5.8.16)
KDE Plasma Version: 5.19.* to 5.20.2
KDE Frameworks Version: 5.75.0
Qt Version: 5.15.1
ADDITIONAL INFORMATION
As I mentioned above, I have determined that the kernel version seems to play
an indicator in this bug. Arch latest (5.9.1) has this bug; however, if I boot
the system to linux-lts, the bug goes away. I cannot test this theory under
OpenSUSE as they do not maintain LTS releases.
Furthermore, I am able to forcefully make KDE recognize it has been unplugged
while closing the laptop lid after unplugging the battery. If I wait for the
computer to suspend, then open the lid, the battery unplugged noise is played
and the system tray indicator works correctly (and keeps working for subsequent
unpluggings). Conversely, if the laptop is suspended with the power plugged in,
the incorrect behavior will resume on the next Resume.
Finally, I have not been able to confirm the presence of this bug under Solus
KDE and they are currently using Linux 5.6.16. Between it functioning in 5.4
and 5.6 but broken by 5.8, I then hypothesize that this bug is a result of
changes in 5.7 or newer kernels.
I would run some debugging or grab logs, but I'm afraid I don't know what to do
that would be useful.
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