Public bug reported:
• DISTRIB_RELEASE=26.04
• DISTRIB_DESCRIPTION="Ubuntu 26.04 LTS"
• packages: linux-image-7.0.0-30-generic/resolute-updates
• Hardware: ASUS Chromebook CX34 (DMI: Google Marasov/Marasov, BIOS
Google_Marasov.14505.884.0)
• GPU: Intel Alder Lake-P Integrated Graphics ([8086:46b3], driver i915)
Black screen (eDP-1) on boot.
(SDDM/KWin backlight disabled/blanked, though the system boots and responds in
the background).
• Working Kernel: 7.0.0-22-generic (Linux 7.0.0)
• Broken Kernels: 7.0.0-29-generic (Linux 7.0.12), 7.0.0-30-generic (Linux
7.0.12)
Workaround:
Adding i915.enable_dpcd_backlight=0 to boot command line restores the internal
display.
Many Thanks.
ProblemType: Bug
DistroRelease: Ubuntu 26.04
Package: linux-image-7.0.0-30-generic 7.0.0-30.30
ProcVersionSignature: Ubuntu 7.0.0-30.30-generic 7.0.12
Uname: Linux 7.0.0-30-generic x86_64
ApportVersion: 2.34.1-0ubuntu0.1
Architecture: amd64
AudioDevicesInUse:
USER PID ACCESS COMMAND
/dev/snd/controlC0: steve 1671 F.... pipewire
steve 1676 F.... wireplumber
/dev/snd/seq: steve 1671 F.... pipewire
CasperMD5CheckResult: unknown
CurrentDesktop: KDE
Date: Thu Aug 20 11:00:50 2026
InstallationDate: Installed on 2026-02-27 (174 days ago)
InstallationMedia: Kubuntu 25.10 "Questing Quokka" - Release amd64 (20251007)
MachineType: Google Marasov
ProcFB: 0 i915drmfb
ProcKernelCmdLine: root=UUID=2dccf64c-5a3f-4063-ae65-f547a0914899 ro quiet
splash i915.enable_dpcd_backlight=0
PulseList: Error: command ['pacmd', 'list'] failed with exit code 1: No
PulseAudio daemon running, or not running as session daemon.
SourcePackage: linux
UpgradeStatus: Upgraded to resolute on 2026-05-18 (94 days ago)
dmi.bios.date: 07/31/2025
dmi.bios.release: 0.0
dmi.bios.vendor: coreboot
dmi.bios.version: Google_Marasov.14505.884.0
dmi.board.name: Marasov
dmi.board.vendor: Google
dmi.board.version: rev3
dmi.chassis.type: 9
dmi.chassis.vendor: Google
dmi.ec.firmware.release: 0.0
dmi.modalias:
dmi:bvncoreboot:bvrGoogle_Marasov.14505.884.0:bd07/31/2025:br0.0:efr0.0:svnGoogle:pnMarasov:pvrrev3:rvnGoogle:rnMarasov:rvrrev3:cvnGoogle:ct9:cvr:skusku1384460:pfaGoogle_Brya:
dmi.product.family: Google_Brya
dmi.product.name: Marasov
dmi.product.sku: sku1384460
dmi.product.version: rev3
dmi.sys.vendor: Google
** Affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug resolute wayland-session
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https://bugs.launchpad.net/bugs/2164632
Title:
regression - i915 driver - backlight fails on boot
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