[Bug 2152139] Re: [amdgpu] DMUB/DMCUB freeze on ASUS TUF A16 during XFCE redraw activity

** Description changed: System intermittently freezes due to AMD GPU DMUB/DC errors on an ASUS A16 laptop running Xubuntu 26.04. Hardware: ASUS TUF Gaming A16 Advantage Edition laptop CPU: AMD Ryzen 7 7735HS (16) @ 4.83 GHz GPU 1: AMD Radeon RX 7700S [Discrete] GPU 2: AMD Radeon 680M [Integrated] Software: Xubuntu 26.04 Kernel: 7.0.0-15-generic Mesa: 26.0.3-1ubuntu1 Observed behavior: The system occasionally hard-freezes during desktop/compositor redraw activity. The mouse and display stop responding and the session becomes unusable. One deterministic reproducer was found which worked in at least 3 separate sessions, although it is not always reproducible in exactly the same way and is not always reliable: Open "LightDM GTK Greeter Settings" Press "Reload Settings" Close the window Press the Super key to open the XFCE Whisker menu System freezes Relevant kernel logs collected during the freeze: amdgpu 0000:78:00.0: [drm [amdgpu]] [PLANE:202] PSR FFU dirty rect size (1920, 1200) amdgpu 0000:78:00.0: [drm [amdgpu]] No reply for DMUB command: status=3 amdgpu 0000:78:00.0: [drm] ERROR dc_dmub_srv_log_diagnostic_data: DMCUB error - collecting diagnostic data This appears related to AMD Display Core / DMUB behavior, possibly involving PSR (Panel Self Refresh) and/or compositor redraws. + Additional observation: + + Testing with the kernel parameter: + amdgpu.dcdebugmask=0x400 + + appears to reduce or prevent the freezes so far, although more testing + is needed as the issue is intermittent before adding this kernel + parameter. + 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/controlC2: javier 3789 F.... wireplumber - /dev/snd/controlC1: javier 3789 F.... wireplumber - /dev/snd/controlC0: javier 3789 F.... wireplumber - /dev/snd/seq: javier 3778 F.... pipewire +  USER PID ACCESS COMMAND +  /dev/snd/controlC2: javier 3789 F.... wireplumber +  /dev/snd/controlC1: javier 3789 F.... wireplumber +  /dev/snd/controlC0: javier 3789 F.... wireplumber +  /dev/snd/seq: javier 3778 F.... pipewire CasperMD5CheckResult: pass CurrentDesktop: XFCE Date: Sun May 10 14:59:05 2026 InstallationDate: Installed on 2026-05-08 (2 days ago) InstallationMedia: Xubuntu 26.04 "Resolute Raccoon" - Release amd64 (20260423.1) MachineType: ASUSTeK COMPUTER INC. ASUS TUF Gaming A16 FA617NT_FA617NT ProcEnviron: - LANG=en_US.UTF-8 - PATH=(custom, no user) - SHELL=/bin/bash - TERM=xterm-256color - XDG_RUNTIME_DIR=<set> +  LANG=en_US.UTF-8 +  PATH=(custom, no user) +  SHELL=/bin/bash +  TERM=xterm-256color +  XDG_RUNTIME_DIR=<set> ProcFB: 0 amdgpudrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-7.0.0-15-generic root=UUID=5fc9515c-5f12-48fa-973f-0f5f53de1813 ro quiet splash SourcePackage: linux UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 01/22/2025 dmi.bios.release: 5.24 dmi.bios.vendor: American Megatrends International, LLC. dmi.bios.version: FA617NT.422 dmi.board.asset.tag: ATN12345678901234567 dmi.board.name: FA617NT 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.ec.firmware.release: 0.255 dmi.modalias: dmi:bvnAmericanMegatrendsInternational,LLC.:bvrFA617NT.422:bd01/22/2025:br5.24:efr0.255:svnASUSTeKCOMPUTERINC.:pnASUSTUFGamingA16FA617NT_FA617NT:pvr1.0:rvnASUSTeKCOMPUTERINC.:rnFA617NT:rvr1.0:cvnASUSTeKCOMPUTERINC.:ct10:cvr1.0:sku:pfaASUSTUFGamingA16: dmi.product.family: ASUS TUF Gaming A16 dmi.product.name: ASUS TUF Gaming A16 FA617NT_FA617NT dmi.product.version: 1.0 dmi.sys.vendor: ASUSTeK COMPUTER INC. -- You received this bug notification because you are subscribed to linux in Ubuntu. Matching subscriptions: Bgg, Bmail, Nb https://bugs.launchpad.net/bugs/2152139 Title: [amdgpu] DMUB/DMCUB freeze on ASUS TUF A16 during XFCE redraw activity Status in linux package in Ubuntu: New Bug description: System intermittently freezes due to AMD GPU DMUB/DC errors on an ASUS A16 laptop running Xubuntu 26.04. Hardware: ASUS TUF Gaming A16 Advantage Edition laptop CPU: AMD Ryzen 7 7735HS (16) @ 4.83 GHz GPU 1: AMD Radeon RX 7700S [Discrete] GPU 2: AMD Radeon 680M [Integrated] Software: Xubuntu 26.04 Kernel: 7.0.0-15-generic Mesa: 26.0.3-1ubuntu1 Observed behavior: The system occasionally hard-freezes during desktop/compositor redraw activity. The mouse and display stop responding and the session becomes unusable. One deterministic reproducer was found which worked in at least 3 separate sessions, although it is not always reproducible in exactly the same way and is not always reliable: Open "LightDM GTK Greeter Settings" Press "Reload Settings" Close the window Press the Super key to open the XFCE Whisker menu System freezes Relevant kernel logs collected during the freeze: amdgpu 0000:78:00.0: [drm [amdgpu]] [PLANE:202] PSR FFU dirty rect size (1920, 1200) amdgpu 0000:78:00.0: [drm [amdgpu]] No reply for DMUB command: status=3 amdgpu 0000:78:00.0: [drm] ERROR dc_dmub_srv_log_diagnostic_data: DMCUB error - collecting diagnostic data This appears related to AMD Display Core / DMUB behavior, possibly involving PSR (Panel Self Refresh) and/or compositor redraws. Additional observation: Testing with the kernel parameter: amdgpu.dcdebugmask=0x400 appears to reduce or prevent the freezes so far, although more testing is needed as the issue is intermittent before adding this kernel parameter. 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/controlC2: javier 3789 F.... wireplumber  /dev/snd/controlC1: javier 3789 F.... wireplumber  /dev/snd/controlC0: javier 3789 F.... wireplumber  /dev/snd/seq: javier 3778 F.... pipewire CasperMD5CheckResult: pass CurrentDesktop: XFCE Date: Sun May 10 14:59:05 2026 InstallationDate: Installed on 2026-05-08 (2 days ago) InstallationMedia: Xubuntu 26.04 "Resolute Raccoon" - Release amd64 (20260423.1) MachineType: ASUSTeK COMPUTER INC. ASUS TUF Gaming A16 FA617NT_FA617NT ProcEnviron:  LANG=en_US.UTF-8  PATH=(custom, no user)  SHELL=/bin/bash  TERM=xterm-256color  XDG_RUNTIME_DIR=<set> ProcFB: 0 amdgpudrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-7.0.0-15-generic root=UUID=5fc9515c-5f12-48fa-973f-0f5f53de1813 ro quiet splash SourcePackage: linux UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 01/22/2025 dmi.bios.release: 5.24 dmi.bios.vendor: American Megatrends International, LLC. dmi.bios.version: FA617NT.422 dmi.board.asset.tag: ATN12345678901234567 dmi.board.name: FA617NT 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.ec.firmware.release: 0.255 dmi.modalias: dmi:bvnAmericanMegatrendsInternational,LLC.:bvrFA617NT.422:bd01/22/2025:br5.24:efr0.255:svnASUSTeKCOMPUTERINC.:pnASUSTUFGamingA16FA617NT_FA617NT:pvr1.0:rvnASUSTeKCOMPUTERINC.:rnFA617NT:rvr1.0:cvnASUSTeKCOMPUTERINC.:ct10:cvr1.0:sku:pfaASUSTUFGamingA16: dmi.product.family: ASUS TUF Gaming A16 dmi.product.name: ASUS TUF Gaming A16 FA617NT_FA617NT dmi.product.version: 1.0 dmi.sys.vendor: ASUSTeK COMPUTER INC. 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