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
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https://bugs.launchpad.net/bugs/2152145
Title:
Regression: i915 GPU hang/freeze on Intel Kaby Lake during Remmina RDP
session in Ubuntu 26.04
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