https://bugs.kde.org/show_bug.cgi?id=511274
Bug ID: 511274
Summary: Black box under cursor on PineTab2 since 6.5
Classification: Plasma
Product: kwin
Version First 6.5.0
Reported In:
Platform: Debian unstable
OS: Linux
Status: REPORTED
Severity: normal
Priority: NOR
Component: general
Assignee: [email protected]
Reporter: [email protected]
Target Milestone: ---
SUMMARY
Since upgrading to Plasma 6.5 I'm seeing a black box under the cursor on my
Pine64 PineTab2 in 90+% of cases. Both in SDDM and when logged in to Plasma.
I'm *not* seeing it on my amd64 systems with either Intel or AMD graphics.
I reported it to the debian-kde ML here:
https://lists.debian.org/debian-kde/2025/10/msg00027.html
Most people use the PineTab2 with 'DanctNIX'/Arch linux and they reported the
same problem and a bug report is here:
https://codeberg.org/DanctNIX/Pine64-Arch/issues/2 which also includes a
picture of the problem.
STEPS TO REPRODUCE
1. Upgrade to Plasma 6.5 including KWin 6.5
2. Reboot
3. See a black box under the cursor in SDDM
4. Log in to the system and still see a black box under the cursor
OBSERVED RESULT
Black box under the cursor
EXPECTED RESULT
No black box under the cursor
SOFTWARE/OS VERSIONS
Linux/KDE Plasma: 6.5.0
KDE Plasma Version: 6.5.0
KDE Frameworks Version: 6.18.0
Qt Version: 6.9.2
ADDITIONAL INFORMATION
In my post/reply on the debian-kde ML I said that maybe resetting/changing
theme/cursor 'things' could help, but I tried all available combinations and
none made the black box (consistently) go away.
As this problem only occurs on my PineTab2, I wondered if maybe 'panfrost' was
the problem. So I went to #panfrost and asked there:
https://oftc.catirclogs.org/panfrost/2025-10-28#
As you can see there, I tried to use it with llvmpipe and the problem was still
there, so that makes it unlikely to be a panfrost problem. In that same
channel, Daniel Stone said "that's a bug in either the rockchip-drm KMS driver,
or in KWin, or both". As the problem appeared with the upgrade to Plasma/KWin
6.5.0 I figured I'd report it against that first.
On Pine64's #pinetab channel, someone asked for the output of ``drm_info``
while the cursor was visible. You can find that here:
https://paste.sr.ht/~diederik/9a45003776d255685a52a21e421e3ae5cbcf9a10
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