[kwin] [Bug 518206] KWin 6.6 Wayland performance regression: desktop lag, delayed input, and high CPU usage on Intel integrated graphics (not present in 6.5.5)
https://bugs.kde.org/show_bug.cgi?id=518206 Zamundaaa changed: What|Removed |Added Resolution|WAITINGFORINFO |UPSTREAM --- Comment #18 from Zamundaaa --- Ah, in that case this is https://gitlab.freedesktop.org/mesa/mesa/-/work_items/13396 -- You are receiving this mail because: You are watching all bug changes.
[kwin] [Bug 518206] KWin 6.6 Wayland performance regression: desktop lag, delayed input, and high CPU usage on Intel integrated graphics (not present in 6.5.5)
https://bugs.kde.org/show_bug.cgi?id=518206 Mathias changed: What|Removed |Added Status|NEEDSINFO |RESOLVED --- Comment #17 from Mathias --- After more investigation, it turns out I was running `mesa-amber`. I switched to it at some point in early 2025 to work around an unrelated bug that's apparently long since fixed. Reinstalling regular `mesa` makes plasmashell show up on the GPU again and the stuttering is gone. For anyone finding this later: on Intel UHD CometLake-H (Gen 9.5, i915) under kwin 6.5, plasmashell was rendering on the GPU via mesa-amber's classic `i965_dri.so` driver, which still supports Gen 9.5 hardware. Under kwin 6.6 plasmashell logs `Failed to query DMA-BUF formats`, holds no `/dev/dri/*` FDs, loads `swrast_dri.so`, and renders in software via `wl_shm`, hence the stutter. I haven't dug into exactly what changed in the negotiation between 6.5 and 6.6, but with proper mesa (iris) it's a non-issue. Not really worth a fix on the kwin side since mesa-amber on Gen 9.5 hardware is the wrong stack to begin with, happy to close. Leaving the explanation here in case the next person to hit this finds it. -- You are receiving this mail because: You are watching all bug changes.
[kwin] [Bug 518206] KWin 6.6 Wayland performance regression: desktop lag, delayed input, and high CPU usage on Intel integrated graphics (not present in 6.5.5)
https://bugs.kde.org/show_bug.cgi?id=518206 --- Comment #16 from Mathias --- I noticed gputop shows very different applications running on 6.6 and 6.5, plasma is missing aswell as my terminal emulator, both of these feel laggy, while vivaldi which isn't missing works fine. -- You are receiving this mail because: You are watching all bug changes.
[kwin] [Bug 518206] KWin 6.6 Wayland performance regression: desktop lag, delayed input, and high CPU usage on Intel integrated graphics (not present in 6.5.5)
https://bugs.kde.org/show_bug.cgi?id=518206 --- Comment #15 from Mathias --- Created attachment 192245 --> https://bugs.kde.org/attachment.cgi?id=192245&action=edit GPUTop 6.5.5 -- You are receiving this mail because: You are watching all bug changes.
[kwin] [Bug 518206] KWin 6.6 Wayland performance regression: desktop lag, delayed input, and high CPU usage on Intel integrated graphics (not present in 6.5.5)
https://bugs.kde.org/show_bug.cgi?id=518206 --- Comment #14 from Mathias --- Created attachment 192244 --> https://bugs.kde.org/attachment.cgi?id=192244&action=edit GPUTop 6.6.5 -- You are receiving this mail because: You are watching all bug changes.
[kwin] [Bug 518206] KWin 6.6 Wayland performance regression: desktop lag, delayed input, and high CPU usage on Intel integrated graphics (not present in 6.5.5)
https://bugs.kde.org/show_bug.cgi?id=518206 Mathias changed: What|Removed |Added Attachment #192242|0 |1 is obsolete|| -- You are receiving this mail because: You are watching all bug changes.
[kwin] [Bug 518206] KWin 6.6 Wayland performance regression: desktop lag, delayed input, and high CPU usage on Intel integrated graphics (not present in 6.5.5)
https://bugs.kde.org/show_bug.cgi?id=518206 Mathias changed: What|Removed |Added Attachment #192241|0 |1 is obsolete|| -- You are receiving this mail because: You are watching all bug changes.
[kwin] [Bug 518206] KWin 6.6 Wayland performance regression: desktop lag, delayed input, and high CPU usage on Intel integrated graphics (not present in 6.5.5)
https://bugs.kde.org/show_bug.cgi?id=518206 Mathias changed: What|Removed |Added Attachment #192241|GPUTOP KDE 6.5 |GPUTOP KDE 6.5.5 description|| -- You are receiving this mail because: You are watching all bug changes.
[kwin] [Bug 518206] KWin 6.6 Wayland performance regression: desktop lag, delayed input, and high CPU usage on Intel integrated graphics (not present in 6.5.5)
https://bugs.kde.org/show_bug.cgi?id=518206 --- Comment #13 from Mathias --- Created attachment 192242 --> https://bugs.kde.org/attachment.cgi?id=192242&action=edit GPUTOP KDE 6.6.5 -- You are receiving this mail because: You are watching all bug changes.
[kwin] [Bug 518206] KWin 6.6 Wayland performance regression: desktop lag, delayed input, and high CPU usage on Intel integrated graphics (not present in 6.5.5)
https://bugs.kde.org/show_bug.cgi?id=518206 --- Comment #12 from Mathias --- Created attachment 192241 --> https://bugs.kde.org/attachment.cgi?id=192241&action=edit GPUTOP KDE 6.5 -- You are receiving this mail because: You are watching all bug changes.
[kwin] [Bug 518206] KWin 6.6 Wayland performance regression: desktop lag, delayed input, and high CPU usage on Intel integrated graphics (not present in 6.5.5)
https://bugs.kde.org/show_bug.cgi?id=518206
--- Comment #11 from Mathias ---
WAYLAND_DEBUG=1 systemsettings 2>&1 | grep dmabuf
[2077283.735] {Default Queue} wl_registry#2.global(57, "zwp_linux_dmabuf_v1",
5)
[2077303.384] wl_registry#42.global(57, "zwp_linux_dmabuf_v1", 5)
[2077303.387] -> wl_registry#42.bind(57, "zwp_linux_dmabuf_v1", 3, new id
[unknown]#44)
[2077303.429] -> zwp_linux_dmabuf_v1#44.destroy()
[2077303.769] wl_registry#43.global(57, "zwp_linux_dmabuf_v1", 5)
The plasma renderer was set to Automatic, changing to OpenGL and restarting did
not help
--
You are receiving this mail because:
You are watching all bug changes.
[kwin] [Bug 518206] KWin 6.6 Wayland performance regression: desktop lag, delayed input, and high CPU usage on Intel integrated graphics (not present in 6.5.5)
https://bugs.kde.org/show_bug.cgi?id=518206 Zamundaaa changed: What|Removed |Added Resolution|--- |WAITINGFORINFO Status|REPORTED|NEEDSINFO --- Comment #10 from Zamundaaa --- Yeah, nothing suspicious there. Judging by the wayland-info output, KWin is using the GPU. Please get the output of > WAYLAND_DEBUG=1 systemsettings 2>&1 | grep dmabuf and also check the "plasma renderer" (search for it in krunner) for whether or not it's set to a software renderer, and whether or not setting the rendering backend explicitly to OpenGL (and rebooting afterwards) helps -- You are receiving this mail because: You are watching all bug changes.
[kwin] [Bug 518206] KWin 6.6 Wayland performance regression: desktop lag, delayed input, and high CPU usage on Intel integrated graphics (not present in 6.5.5)
https://bugs.kde.org/show_bug.cgi?id=518206 Mathias changed: What|Removed |Added Resolution|DUPLICATE |--- Status|RESOLVED|REPORTED --- Comment #9 from Mathias --- These are my logs, I don't see anything particularly obvious here -- You are receiving this mail because: You are watching all bug changes.
[kwin] [Bug 518206] KWin 6.6 Wayland performance regression: desktop lag, delayed input, and high CPU usage on Intel integrated graphics (not present in 6.5.5)
https://bugs.kde.org/show_bug.cgi?id=518206 --- Comment #8 from Mathias --- Created attachment 192019 --> https://bugs.kde.org/attachment.cgi?id=192019&action=edit journalctl --user-unit plasma-kwin_wayland --boot 0 -- You are receiving this mail because: You are watching all bug changes.
[kwin] [Bug 518206] KWin 6.6 Wayland performance regression: desktop lag, delayed input, and high CPU usage on Intel integrated graphics (not present in 6.5.5)
https://bugs.kde.org/show_bug.cgi?id=518206 --- Comment #7 from Mathias --- Created attachment 192018 --> https://bugs.kde.org/attachment.cgi?id=192018&action=edit wayland info -- You are receiving this mail because: You are watching all bug changes.
[kwin] [Bug 518206] KWin 6.6 Wayland performance regression: desktop lag, delayed input, and high CPU usage on Intel integrated graphics (not present in 6.5.5)
https://bugs.kde.org/show_bug.cgi?id=518206 --- Comment #6 from Mathias --- Hi, this might be the same bug, but I'd like to add I'm not on Nvidia like the other commentor here are. I will not be able to post the outputs of the commands you requested until Monday as I don't have access to the affected laptop currently. -- You are receiving this mail because: You are watching all bug changes.
[kwin] [Bug 518206] KWin 6.6 Wayland performance regression: desktop lag, delayed input, and high CPU usage on Intel integrated graphics (not present in 6.5.5)
https://bugs.kde.org/show_bug.cgi?id=518206 Zamundaaa changed: What|Removed |Added Resolution|WAITINGFORINFO |DUPLICATE Status|NEEDSINFO |RESOLVED --- Comment #5 from Zamundaaa --- Good, that looks exactly like bug 517987 *** This bug has been marked as a duplicate of bug 517987 *** -- You are receiving this mail because: You are watching all bug changes.
[kwin] [Bug 518206] KWin 6.6 Wayland performance regression: desktop lag, delayed input, and high CPU usage on Intel integrated graphics (not present in 6.5.5)
https://bugs.kde.org/show_bug.cgi?id=518206 --- Comment #4 from ssergio-ll --- Created attachment 191934 --> https://bugs.kde.org/attachment.cgi?id=191934&action=edit journalctl --user-unit plasma-kwin_wayland --boot 0 -- You are receiving this mail because: You are watching all bug changes.
[kwin] [Bug 518206] KWin 6.6 Wayland performance regression: desktop lag, delayed input, and high CPU usage on Intel integrated graphics (not present in 6.5.5)
https://bugs.kde.org/show_bug.cgi?id=518206 --- Comment #3 from ssergio-ll --- I also have this bug. I’m using KDE Neon. My entire system is slow — the menu, browser, typing at times, applications… This is my setup: Operating System: KDE neon User Edition KDE Plasma Version: 6.6.4 KDE Frameworks Version: 6.25.0 Qt Version: 6.10.2 Kernel Version: 6.8.0-110-generic (64-bit) Graphics Platform: Wayland Processors: 12 × Intel® Core™ i7-8750H CPU @ 2.20GHz Memory: 64 GiB of RAM (62.6 GiB usable) Graphics Processor 1: Intel® UHD Graphics 630 Graphics Processor 2: NVIDIA GeForce RTX 2060 Manufacturer: Micro-Star International Co., Ltd. Product Name: GS75 Stealth 8SE System Version: REV:1.0 Attached are text files with my wayland-info and journalctl logs in case they are useful. -- You are receiving this mail because: You are watching all bug changes.
[kwin] [Bug 518206] KWin 6.6 Wayland performance regression: desktop lag, delayed input, and high CPU usage on Intel integrated graphics (not present in 6.5.5)
https://bugs.kde.org/show_bug.cgi?id=518206 ssergio-ll changed: What|Removed |Added CC||[email protected] --- Comment #2 from ssergio-ll --- Created attachment 191933 --> https://bugs.kde.org/attachment.cgi?id=191933&action=edit wayland-info -- You are receiving this mail because: You are watching all bug changes.
[kwin] [Bug 518206] KWin 6.6 Wayland performance regression: desktop lag, delayed input, and high CPU usage on Intel integrated graphics (not present in 6.5.5)
https://bugs.kde.org/show_bug.cgi?id=518206 Zamundaaa changed: What|Removed |Added Status|REPORTED|NEEDSINFO CC||[email protected] Resolution|--- |WAITINGFORINFO --- Comment #1 from Zamundaaa --- Please attach the output of > wayland-info and > journalctl --user-unit plasma-kwin_wayland --boot 0 It sounds as though your system may be falling back to software rendering for some reason. -- You are receiving this mail because: You are watching all bug changes.
