[Bug 2148725] Re: Green screen after KMS on Intel Jasper Lake (Beelink U59) – Kubuntu 26.04 daily

Same model, same firmeware. -- You received this bug notification because you are subscribed to linux in Ubuntu. Matching subscriptions: Bgg, Bmail, Nb https://bugs.launchpad.net/bugs/2148725 Title: Green screen after KMS on Intel Jasper Lake (Beelink U59) – Kubuntu 26.04 daily Status in kwin package in Ubuntu: New Status in linux package in Ubuntu: New Status in plasma-desktop package in Ubuntu: New Bug description: Collected from Kubuntu 26.04 daily live session (booted with nomodeset due to graphics issue). System: Beelink U59 mini PC (Intel Jasper Lake, Intel UHD Graphics) Environment: Kubuntu 26.04 daily build (pre-release) Issue: System boots normally through early kernel messages. After the display switches to higher resolution (KMS activation), the screen turns solid green. Behavior: - Splash screen appears normally - Resolution changes (text becomes very small, likely 4K mode) - Several additional lines print - Screen turns completely green Workarounds tested: - nomodeset → boots successfully (no acceleration) - i915.enable_psr=0 → no change - i915.enable_dc=0 → no change - i915.enable_fbc=0 → no change - combinations of the above → no change This suggests a failure in i915 during KMS initialization. Reproducible: Yes, occurs consistently on every boot without nomodeset. Additional notes: The same Kubuntu 26.04 daily ISO boots and operates normally on another system at 1080p, indicating the issue is specific to this hardware (Beelink U59 / Intel Jasper Lake). System is stable in Windows 11 with 4K video playback, indicating hardware is functioning correctly. Ubuntu 7.0.0-14.14-generic 7.0.0 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/kwin/+bug/2148725/+subscriptions