[Bug 2169960] Re: [i915][CFL] Color inversion on resume/boot with 10-bit primary plane (Sharp 0x149a eDP)

** Tags added: kernel-daily-bug -- You received this bug notification because you are subscribed to linux in Ubuntu. Matching subscriptions: Bgg, Bmail, Nb https://bugs.launchpad.net/bugs/2169960 Title: [i915][CFL] Color inversion on resume/boot with 10-bit primary plane (Sharp 0x149a eDP) Status in linux package in Ubuntu: New Bug description: 1) The release of Ubuntu you are using: Ubuntu 26.04 LTS 2) The version of the package you are using: linux-image-7.0.0-38-generic 3) What you expected to happen: The i915 driver should correctly apply hardware dithering when a 10-bit plane is requested by Mutter on an 8-bit eDP panel. It must also properly restore the hardware Gamma LUT and display pipe state upon waking from ACPI sleep states (both s2idle and S3), displaying normal colors. 4) What happened instead: Upon cold boot and after resuming from sleep, the screen colors are completely inverted or heavily posterized. --- DETAILED ROOT CAUSE & HARDWARE SPECS: * Machine: Dell Precision 5530 * CPU/GPU: Intel Core i7-8850H (Coffee Lake 3e9b) / Intel UHD 630 * Panel: Internal 1080p eDP panel (Sharp 0x149a) * Compositor: GNOME on Wayland (Mutter 50.1) Taking a screenshot (PrtScr) while the screen is physically inverted yields a PERFECT image with normal colors. This isolates the issue to the kernel i915 driver failing to push the correct state to the hardware/panel, while the Wayland compositor renders correctly. Running `drm_info` reveals that Mutter is successfully requesting and scanning out a 10-bit primary plane: Format: XRGB2101010 (0x30335258) The Sharp 1080p panel is an 8-bit (or 6-bit+FRC) display. The i915 driver accepts the 10-bit commit from Mutter but silently fails to configure the pipe's hardware dithering or color space conversion correctly on boot and resume, causing a severe bit-shift that manifests as color inversion. Workarounds tested that failed to persist: - i915.enable_dc=0 and i915.enable_psr=0 (Did not prevent the bug). - mem_sleep_default=deep (Entered S3 successfully, but inversion still happened on wake). - Restricting the connector via `video=eDP-1:bpc=8` in GRUB temporarily forces Mutter to XRGB8888, but the driver state still desyncs across power cycles. ProblemType: Bug DistroRelease: Ubuntu 26.04 Package: linux-image-7.0.0-38-generic 7.0.0-38.38 ProcVersionSignature: Ubuntu 7.0.0-38.38-generic 7.0.14 Uname: Linux 7.0.0-38-generic x86_64 ApportVersion: 2.34.1-0ubuntu0.1 Architecture: amd64 AudioDevicesInUse: USER PID ACCESS COMMAND /dev/snd/controlC0: omar-ashraf 5735 F.... wireplumber /dev/snd/seq: omar-ashraf 5715 F.... pipewire CasperMD5CheckResult: pass CurrentDesktop: ubuntu:GNOME Date: Thu Oct 8 12:54:25 2026 InstallationDate: Installed on 2026-04-09 (182 days ago) InstallationMedia: Ubuntu 24.04.3 LTS "Noble Numbat" - Release amd64 (20250805.1) Lsusb: Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 001 Device 003: ID 27c6:5395 Shenzhen Goodix Technology Co.,Ltd. Fingerprint Reader Bus 001 Device 004: ID 0c45:671d Microdia Integrated_Webcam_HD Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub MachineType: Dell Inc. Precision 5530 ProcEnviron: LANG=en_US.UTF-8 PATH=(custom, no user) SHELL=/bin/bash TERM=xterm-256color XDG_RUNTIME_DIR=<set> ProcFB: 0 i915drmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-7.0.0-38-generic root=UUID=f4aac615-68a0-4be5-b90f-363df54a8e8f ro video=eDP-1:bpc=8 mem_sleep_default=deep i915.enable_dc=0 quiet splash i915.enable_psr=0 i915.enable_psr=0 i915.enable_fbc=0 crashkernel=2G-4G:320M,4G-32G:512M,32G-64G:1024M,64G-128G:2048M,128G-:4096M SourcePackage: linux UpgradeStatus: Upgraded to resolute on 2026-10-02 (6 days ago) dmi.bios.date: 12/11/2024 dmi.bios.release: 1.42 dmi.bios.vendor: Dell Inc. dmi.bios.version: 1.42.0 dmi.board.name: 0NFGCT dmi.board.vendor: Dell Inc. dmi.board.version: A00 dmi.chassis.asset.tag: AI942495 dmi.chassis.type: 10 dmi.chassis.vendor: Dell Inc. dmi.modalias: dmi:bvnDellInc.:bvr1.42.0:bd12/11/2024:br1.42:svnDellInc.:pnPrecision5530:pvr:rvnDellInc.:rn0NFGCT:rvrA00:cvnDellInc.:ct10:cvr:sku087D:pfaPrecision: dmi.product.family: Precision dmi.product.name: Precision 5530 dmi.product.sku: 087D dmi.sys.vendor: Dell Inc. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2169960/+subscriptions