507248 2025-07-19 22:17:00 +0000 Kwin crashes on login with magnifier enabled and InitialZoom > 1 2025-07-25 15:54:47 +0000 1 1 4 Plasma kwin effects-various 6.4.3 Arch Linux Linux RESOLVED FIXED VHI crash --- 1 jacobryanham kwin-bugs-null kde nate https://invent.kde.org/plasma/kwin/-/commit/4e1e1d65f488d764e1ddbb18888b2c6509fd4642 6.4.4 0 oldest_to_newest 2441638 0 183361 jacobryanham 2025-07-19 22:17:00 +0000 Created attachment 183361 Kwin_wayland backtrace SUMMARY Enabling the magnifier effect in system settings crashes Kwin. Users who have the effect enabled at login are unable to use Plasma. STEPS TO REPRODUCE 1. Go to system settings 2. Enable "magnifier" under desktop effects OBSERVED RESULT kwin_wayland crashes and the user is returned either to tty or their login manager. EXPECTED RESULT kwin should let you use the magnifier. SOFTWARE/OS VERSIONS Linux/KDE Plasma: KDE Plasma Version: 6.4.3 KDE Frameworks Version: 6.16.0 Qt Version: 6.9.1 ADDITIONAL INFORMATION https://bbs.archlinux.org/viewtopic.php?pid=2252529#p2252529 Discussion of the same issue on the Arch Linux forums 2441653 1 jacobryanham 2025-07-20 00:24:27 +0000 Further investigation reveals that this crash only occurs when the magnifier effect is loaded and InitialZoom != 1 in kwinrc. This means that logging out without first zooming out the magnifier will cause the next login to fail. 2442301 2 bug-janitor 2025-07-22 19:48:52 +0000 A possibly relevant merge request was started @ https://invent.kde.org/plasma/kwin/-/merge_requests/7926 2442453 3 xaver.hugl 2025-07-23 12:39:38 +0000 Git commit 407fa6ee9367e8f00488b83d0be8b18261391c59 by Xaver Hugl. Committed on 23/07/2025 at 12:06. Pushed by zamundaaa into branch 'master'. plugins/magnifier: actually set the initial zoom properly toggle() doesn't actually do anything if the current zoom level is 1.0 and target zoom is not 1.0 M +1 -4 src/plugins/magnifier/magnifier.cpp https://invent.kde.org/plasma/kwin/-/commit/407fa6ee9367e8f00488b83d0be8b18261391c59 2442454 4 xaver.hugl 2025-07-23 12:39:46 +0000 Git commit de0394cf9c2ac149b3d8e6140d6e340ae6afb521 by Xaver Hugl. Committed on 23/07/2025 at 12:06. Pushed by zamundaaa into branch 'master'. plugins/magnifier: allocate an fbo when rendering, and don't crash if it fails This is less error prone and can actually handle GPU resets M +18 -24 src/plugins/magnifier/magnifier.cpp https://invent.kde.org/plasma/kwin/-/commit/de0394cf9c2ac149b3d8e6140d6e340ae6afb521 2442466 5 xaver.hugl 2025-07-23 13:44:24 +0000 Git commit 4e1e1d65f488d764e1ddbb18888b2c6509fd4642 by Xaver Hugl. Committed on 23/07/2025 at 12:56. Pushed by zamundaaa into branch 'Plasma/6.4'. plugins/magnifier: actually set the initial zoom properly toggle() doesn't actually do anything if the current zoom level is 1.0 and target zoom is not 1.0 (cherry picked from commit 407fa6ee9367e8f00488b83d0be8b18261391c59) M +1 -4 src/plugins/magnifier/magnifier.cpp https://invent.kde.org/plasma/kwin/-/commit/4e1e1d65f488d764e1ddbb18888b2c6509fd4642 2442467 6 xaver.hugl 2025-07-23 13:44:33 +0000 Git commit e1c80aed50288255c14a55a71b9759dcef2bd4da by Xaver Hugl. Committed on 23/07/2025 at 12:57. Pushed by zamundaaa into branch 'Plasma/6.4'. plugins/magnifier: allocate an fbo when rendering, and don't crash if it fails This is less error prone and can actually handle GPU resets (cherry picked from commit de0394cf9c2ac149b3d8e6140d6e340ae6afb521) M +18 -24 src/plugins/magnifier/magnifier.cpp https://invent.kde.org/plasma/kwin/-/commit/e1c80aed50288255c14a55a71b9759dcef2bd4da 183361 2025-07-19 22:17:00 +0000 2025-07-19 22:17:00 +0000 Kwin_wayland backtrace backtrace.txt text/plain 5701 jacobryanham IzAgIF9fcHRocmVhZF9raWxsX2ltcGxlbWVudGF0aW9uICh0aHJlYWRpZD08b3B0aW1pemVkIG91 dD4sIHNpZ25vPXNpZ25vQGVudHJ5PTExLCBub190aWQ9bm9fdGlkQGVudHJ5PTApIGF0IHB0aHJl YWRfa2lsbC5jOjQ0CiMxICAweDAwMDA3ZjMyMjUyYTc4MTMgaW4gX19wdGhyZWFkX2tpbGxfaW50 ZXJuYWwgKHRocmVhZGlkPTxvcHRpbWl6ZWQgb3V0Piwgc2lnbm89MTEpIGF0IHB0aHJlYWRfa2ls bC5jOjg5CiMyICAweDAwMDA3ZjMyMjUyNGRkYzAgaW4gX19HSV9yYWlzZSAoc2lnPTExKSBhdCAu Li9zeXNkZXBzL3Bvc2l4L3JhaXNlLmM6MjYKIzMgIDB4MDAwMDdmMzIyOGNkNGU5NyBpbiBLQ3Jh 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