Public bug reported: Hardware: Ninkear laptop (board AB8139, BIOS AB8139_S_2C_V00.01_002) GPU: AMD Barcelo [1002:15e7] rev c2, DCN 2.1, DMUB fw 0x0101002B Panel: BOE NE160QDM-NY2 (EDID product 0x0997), eDP Ubuntu 26.04.1 LTS
Works: 6.17.0-35-generic Broken: 7.0.0-31-generic, 7.0.0-38-generic (7.0.14 base) After the firmware logo the internal screen goes black and stays black. System boots fully (gdm starts), only the eDP output is dead. Not a backlight issue: amdgpu.backlight=0 and amdgpu.dcdebugmask=0x10 change nothing. dmesg on every 7.0 boot (never on 6.17): [drm] *ERROR* dc_dmub_srv_log_diagnostic_data: DMCUB error - collecting diagnostic data [drm] *ERROR* dpcd_set_link_settings:1127: core_link_write_dpcd (DP_LANE_COUNT_SET) failed [drm] *ERROR* dpcd_set_link_settings:1144: core_link_write_dpcd (DP_LINK_BW_SET) failed [drm] *ERROR* dpcd_set_link_settings:1149: core_link_write_dpcd (DP_LINK_RATE_SET) failed [drm] enabling link 0 failed: 15 Same signature as CachyOS 7.0 regression on Renoir/DCN2.1, where the DMUB_CMD__VBIOS_LVTMA_CONTROL (panel power) command timed out early (~183 ms needed): https://github.com/CachyOS/linux-cachyos/issues/832 https://github.com/CachyOS/linux-cachyos/issues/831 Upstream stable v7.0.14 dmub_srv_wait_for_idle() looks unchanged, so the cause in the Ubuntu kernel may be a different patch on the same path. ProblemType: Bug DistroRelease: Ubuntu 26.04 Package: linux-image-7.0.0-38-generic 7.0.0-38.38 ProcVersionSignature: Ubuntu 6.17.0-35.35-generic 6.17.13 Uname: Linux 6.17.0-35-generic x86_64 ApportVersion: 2.34.1-0ubuntu0.1 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC1: muhmuhhum 3752 F.... wireplumber /dev/snd/controlC0: muhmuhhum 3752 F.... wireplumber /dev/snd/seq: muhmuhhum 3730 F.... pipewire CasperMD5CheckResult: pass CurrentDesktop: ubuntu:GNOME Date: Sun Oct 18 18:14:05 2026 InstallationDate: Installed on 2025-09-23 (390 days ago) InstallationMedia: Ubuntu 24.04.2 LTS "Noble Numbat" - Release amd64 (20250215) MachineType: AB8139 AB8139 ProcFB: 0 amdgpudrmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-6.17.0-35-generic root=UUID=264ccfa6-ccfb-4889-a0e2-cc9108881d63 ro quiet splash crashkernel=2G-4G:320M,4G-32G:512M,32G-64G:1024M,64G-128G:2048M,128G-:4096M SourcePackage: linux UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 04/09/2025 dmi.bios.release: 0.2 dmi.bios.vendor: American Megatrends International, LLC. dmi.bios.version: AB8139_S_2C_V00.01_002 dmi.board.asset.tag: Default string dmi.board.name: Default string dmi.board.vendor: Default string dmi.board.version: Default string dmi.chassis.asset.tag: Default string dmi.chassis.type: 10 dmi.chassis.vendor: Default string dmi.chassis.version: Default string dmi.ec.firmware.release: 1.1 dmi.modalias: dmi:bvnAmericanMegatrendsInternational,LLC.:bvrAB8139_S_2C_V00.01_002:bd04/09/2025:br0.2:efr1.1:svnAB8139:pnAB8139:pvrDefaultstring:rvnDefaultstring:rnDefaultstring:rvrDefaultstring:cvnDefaultstring:ct10:cvrDefaultstring:skuDefaultstring: dmi.product.family: NoteBook dmi.product.name: AB8139 dmi.product.sku: Default string dmi.product.version: Default string dmi.sys.vendor: AB8139 ** Affects: linux (Ubuntu) Importance: Undecided Status: New ** Tags: amd64 apport-bug resolute wayland-session -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/2171342 Title: [Renoir/Barcelo] Internal eDP panel black after boot on 7.0 (enabling link 0 failed: 15), works on 6.17 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2171342/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
