[Bug 2152145] [NEW] Regression: i915 GPU hang/freeze on Intel Kaby Lake during Remmina RDP session in Ubuntu 26.04

Public bug reported: Hardware: ASUS UX331UA, Intel Core (Kaby Lake), i915 graphics. OS: Ubuntu 26.04 (Kernel 7.x) Issue Description: The system completely freezes (cursor hangs, deadlock, requires a hard hardware reboot) when using Remmina (RDP protocol). The crash consistently happens during sudden GUI updates inside the RDP session (e.g., printing to PDF from a remote Windows application and closing the dialog window). Troubleshooting done: Tried kernel parameters: i915.enable_psr=0, intel_idle.max_cstate=1, i915.enable_guc=0, i915.enable_dc=0 – None of these prevented the crash. Switching to an external FHD monitor (via direct HDMI) instead of a 2K display did not resolve the issue. The Regresion Proof: When I boot into the older kernel (the one carried over from Ubuntu 25.10), the system is 100% stable. The RDP session works flawlessly, and printing to PDF does not crash the system. Conclusion: This is a severe regression in the newer kernel provided in Ubuntu 26.04, likely related to the i915 driver's memory management (TTM) or rendering instructions during large screen redraws on Kaby Lake architecture. ProblemType: Bug DistroRelease: Ubuntu 26.04 Package: linux-image-7.0.0-15-generic 7.0.0-15.15 ProcVersionSignature: Ubuntu 7.0.0-15.15-generic 7.0.0 Uname: Linux 7.0.0-15-generic x86_64 ApportVersion: 2.34.0-0ubuntu2 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: milan-bouda 3944 F.... wireplumber /dev/snd/seq: milan-bouda 3922 F.... pipewire CasperMD5CheckResult: pass CurrentDesktop: i3 Date: Sun May 10 22:33:37 2026 InstallationDate: Installed on 2025-05-25 (350 days ago) InstallationMedia: Ubuntu 25.04 "Plucky Puffin" - Release amd64 (20250415.3) MachineType: ASUSTeK COMPUTER INC. UX331UA ProcEnviron: LANG=cs_CZ.UTF-8 PATH=(custom, no user) SHELL=/bin/bash TERM=xterm-256color XDG_RUNTIME_DIR=<set> ProcFB: 0 i915drmfb ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-7.0.0-15-generic root=/dev/mapper/ubuntu--vg-ubuntu--lv ro quiet splash intel_iommu=off i915.enable_psr=0 crashkernel=2G-4G:320M,4G-32G:512M,32G-64G:1024M,64G-128G:2048M,128G-:4096M SourcePackage: linux UpgradeStatus: Upgraded to resolute on 2026-05-10 (1 days ago) dmi.bios.date: 10/27/2021 dmi.bios.release: 5.12 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: UX331UA.314 dmi.board.asset.tag: ATN12345678901234567 dmi.board.name: UX331UA dmi.board.vendor: ASUSTeK COMPUTER INC. dmi.board.version: 1.0 dmi.chassis.asset.tag: No Asset Tag dmi.chassis.type: 10 dmi.chassis.vendor: ASUSTeK COMPUTER INC. dmi.chassis.version: 1.0 dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrUX331UA.314:bd10/27/2021:br5.12:svnASUSTeKCOMPUTERINC.:pnUX331UA:pvr1.0:rvnASUSTeKCOMPUTERINC.:rnUX331UA:rvr1.0:cvnASUSTeKCOMPUTERINC.:ct10:cvr1.0:sku:pfaZenBook: dmi.product.family: ZenBook dmi.product.name: UX331UA dmi.product.version: 1.0 dmi.sys.vendor: ASUSTeK COMPUTER INC. ** Affects: linux (Ubuntu) Importance: Undecided Status: New ** Tags: amd64 apport-bug resolute -- You received this bug notification because you are subscribed to linux in Ubuntu. Matching subscriptions: Bgg, Bmail, Nb https://bugs.launchpad.net/bugs/2152145 Title: Regression: i915 GPU hang/freeze on Intel Kaby Lake during Remmina RDP session in Ubuntu 26.04 Status in linux package in Ubuntu: New Bug description: Hardware: ASUS UX331UA, Intel Core (Kaby Lake), i915 graphics. OS: Ubuntu 26.04 (Kernel 7.x) Issue Description: The system completely freezes (cursor hangs, deadlock, requires a hard hardware reboot) when using Remmina (RDP protocol). The crash consistently happens during sudden GUI updates inside the RDP session (e.g., printing to PDF from a remote Windows application and closing the dialog window). Troubleshooting done: Tried kernel parameters: i915.enable_psr=0, intel_idle.max_cstate=1, i915.enable_guc=0, i915.enable_dc=0 – None of these prevented the crash. Switching to an external FHD monitor (via direct HDMI) instead of a 2K display did not resolve the issue. The Regresion Proof: When I boot into the older kernel (the one carried over from Ubuntu 25.10), the system is 100% stable. The RDP session works flawlessly, and printing to PDF does not crash the system. Conclusion: This is a severe regression in the newer kernel provided in Ubuntu 26.04, likely related to the i915 driver's memory management (TTM) or rendering instructions during large screen redraws on Kaby Lake architecture. ProblemType: Bug DistroRelease: Ubuntu 26.04 Package: linux-image-7.0.0-15-generic 7.0.0-15.15 ProcVersionSignature: Ubuntu 7.0.0-15.15-generic 7.0.0 Uname: Linux 7.0.0-15-generic x86_64 ApportVersion: 2.34.0-0ubuntu2 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: milan-bouda 3944 F.... wireplumber /dev/snd/seq: milan-bouda 3922 F.... pipewire CasperMD5CheckResult: pass CurrentDesktop: i3 Date: Sun May 10 22:33:37 2026 InstallationDate: Installed on 2025-05-25 (350 days ago) InstallationMedia: Ubuntu 25.04 "Plucky Puffin" - Release amd64 (20250415.3) MachineType: ASUSTeK COMPUTER INC. UX331UA ProcEnviron: LANG=cs_CZ.UTF-8 PATH=(custom, no user) SHELL=/bin/bash TERM=xterm-256color XDG_RUNTIME_DIR=<set> ProcFB: 0 i915drmfb ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-7.0.0-15-generic root=/dev/mapper/ubuntu--vg-ubuntu--lv ro quiet splash intel_iommu=off i915.enable_psr=0 crashkernel=2G-4G:320M,4G-32G:512M,32G-64G:1024M,64G-128G:2048M,128G-:4096M SourcePackage: linux UpgradeStatus: Upgraded to resolute on 2026-05-10 (1 days ago) dmi.bios.date: 10/27/2021 dmi.bios.release: 5.12 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: UX331UA.314 dmi.board.asset.tag: ATN12345678901234567 dmi.board.name: UX331UA dmi.board.vendor: ASUSTeK COMPUTER INC. dmi.board.version: 1.0 dmi.chassis.asset.tag: No Asset Tag dmi.chassis.type: 10 dmi.chassis.vendor: ASUSTeK COMPUTER INC. dmi.chassis.version: 1.0 dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrUX331UA.314:bd10/27/2021:br5.12:svnASUSTeKCOMPUTERINC.:pnUX331UA:pvr1.0:rvnASUSTeKCOMPUTERINC.:rnUX331UA:rvr1.0:cvnASUSTeKCOMPUTERINC.:ct10:cvr1.0:sku:pfaZenBook: dmi.product.family: ZenBook dmi.product.name: UX331UA dmi.product.version: 1.0 dmi.sys.vendor: ASUSTeK COMPUTER INC. 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