Many of you know the KDE app “filelight” to analyze consumed disk space for a given directory. Windows equivalent is WinDirStat. Here’s what it should look like:
Here’s what it looks like on an Nvidia system with Qt 6.9.0 or newer installed:
Steps to reproduce
- On Wayland linux desktop, with Qt 6.9 or newer installed (has been reproduced with 6.9.1 aswell) start the application and choose any folder.
- A pie chart should appear on the right, but it’s invisible
Additional information
- Nvidia driver doesn’t seem to matter, has been confirmed on stable and beta drivers (570.153.02 and 575.57.08)
- There are workarounds, but the average user is not gonna bother finding these, so it won’t work for them.
- KDE bug report for this bug
- nvidia-bug-report.log.gz (706.0 KB)
We believe this is a problem in the Nvidia driver. Can you guys take a look at this? Thanks in advance. KDE users on Nvidia systems will appreciate your efforts.
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this issue is still happening on 575.64
nvidia-bug-report.log.gz (125.0 KB)
Thanks for reporting this issue. We have created an internal bug report (5413500) for it.
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After investigating the issue, we found out that it is caused by a bug in Qt. We created a bug report here: https://bugreports.qt.io/browse/QTBUG-138986
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Thank you for your effort, I really appreciate it
Hey, this is fixed now
This is on Fedora 42 KDE Plasma 6.4.5 (Wayland) with NVIDIA driver 580.95.05
Thanks for the work!
@dkorkmazturk Hi, not sure how or why @agarplayerarlon said it’s fixed while it’s clearly not, I still have this issue!
My GPU is GTX 1050 Ti Nvidia driver 580.95.05-0ubuntu1! All the Qt, framework etc version numbers are shown on the screenshot below. Thank you for looking into this.
Side note, I have an older Nvidia Quadro K620 GPU, and there Filelight works as it should. Perhaps you guys forgot to fix it for the Pascal GTX series then?
I’m on Fedora which is much more up to date than Kubuntu, I bet you will have it fixed in the next Kubuntu release
We have the same versions…
No we don’t, I have a newer version of Filelight than what you show in your screenshot and a newer version of the KDE Frameworks
Ok then I will switch my repos to Kubuntu backports, cause that’s more recent than Fedora, I’ll see if it helped.
And please next time, write out the full versions of everything, cause in your original post, we can not tell what Filelight version you were at. Neither your KDE Frameworks nor Qt version..
like so
Operating System: Kubuntu 25.10
KDE Plasma Version: 6.4.5
KDE Frameworks Version: 6.17.0
Qt Version: 6.9.2
Kernel Version: 6.17.0-5-generic (64-bit)
Graphics Platform: Wayland
Processors: 4 × Intel® Core™ i5-6500 CPU @ 3.20GHz
Memory: 16 GiB of RAM (15.6 GiB usable)
Graphics Processor: NVIDIA GeForce GTX 1050 Ti
Manufacturer: MSI
Product Name: MS-7972
System Version: 2.0
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This bug is not in the driver, so updating the driver won’t solve the problem. It seems like you have Qt 6.9.2 on your system. The bug that we reported to Qt that was causing this issue (https://bugreports.qt.io/browse/QTBUG-138986) is fixed in 6.9.3. It seems like Filelight also submitted a fix that should fix this issue on older Qt versions here 🍒lower MSAA samples from 32 to 8 (!197) · Merge requests · Utilities / Filelight · GitLab as we suggested in https://bugs.kde.org/show_bug.cgi?id=502709#c44.
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Yepp, I know it’s not the driver, thats why I’m switching to BP now, cause it has latest plasma 6.5.0+ all the upgraded Qt frameworks and more recent Filelight. I’ll come back after a quick reboot to report in.
Thank you for the amazing work!
Backports did the trick with these versions:
- Filelight 25.08.02
- KDE Frameworks 6.19.0
- KDE Plasma 6.5.0
So for people, who are in the same boat as I was before and confused, you need to be on these versions and the visual glitch will go away. And probably the latest Nvidia driver ofcourse (which I couldn’t test cause here in Ubuntu ecosystem we always have the latest and greatest, but probably it’s gonna work with older Nvidia drivers too)
Thanks for the teamwork Nvidia and KDE team
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