*** This bug is a duplicate of bug 2161309 *** https://bugs.launchpad.net/bugs/2161309 ** This bug has been marked a duplicate of bug 2161309 Backlight regression -- You received this bug notification because you are subscribed to linux in Ubuntu. Matching subscriptions: Bgg, Bmail, Nb https://bugs.launchpad.net/bugs/2164569 Title: Display regression with 7.0.0-28 and newer. Brightness and resume from suspend problems. Status in linux package in Ubuntu: New Bug description: Kernel 7.0.0-28-generic and 7.0.0-30-generic have caused a regression with thinkpad T440s where altering built in display brightness ceases to work and resuming the display after waking from sleep fails. Multiple warnings from display drivers provided via journalctl output. Kernel 7.0.0-27-generic does not present this behavior. ``` $ uname -a Linux T440s 7.0.0-30-generic #30-Ubuntu SMP PREEMPT_DYNAMIC Fri Jul 31 18:22:54 UTC 2026 x86_64 GNU/Linux $ journalctl -b -1 | grep -iE "suspend|resume|drm|i915" | tail -80 Aug 18 19:52:44 T440s kernel: ACPI: bus type drm_connector registered Aug 18 19:52:44 T440s kernel: simple-framebuffer simple-framebuffer.0: [drm] Registered 1 planes with drm panic Aug 18 19:52:44 T440s kernel: [drm] Initialized simpledrm 1.0.0 for simple-framebuffer.0 on minor 0 Aug 18 19:52:44 T440s kernel: simple-framebuffer simple-framebuffer.0: [drm] fb0: simpledrmdrmfb frame buffer device Aug 18 19:52:44 T440s systemd[1]: modprobe@drm.service - Load Kernel Module drm skipped, unmet condition check ConditionKernelModuleLoaded=!drm Aug 18 19:52:46 T440s kernel: i915 0000:00:02.0: [drm] Found haswell/ult (device ID 0a16) integrated display version 7.00 stepping N/A Aug 18 19:52:46 T440s kernel: i915 0000:00:02.0: vgaarb: deactivate vga console Aug 18 19:52:46 T440s kernel: i915 0000:00:02.0: vgaarb: VGA decodes changed: olddecodes=io+mem,decodes=io+mem:owns=io+mem Aug 18 19:52:46 T440s kernel: i915 0000:00:02.0: [drm] Registered 3 planes with drm panic Aug 18 19:52:46 T440s kernel: [drm] Initialized i915 1.6.0 for 0000:00:02.0 on minor 1 Aug 18 19:52:47 T440s kernel: fbcon: i915drmfb (fb0) is primary device Aug 18 19:52:47 T440s kernel: i915 0000:00:02.0: [drm] fb0: i915drmfb frame buffer device Aug 18 19:52:47 T440s kernel: snd_hda_intel 0000:00:03.0: bound 0000:00:02.0 (ops intel_audio_component_bind_ops [i915]) Aug 18 19:52:50 T440s rtkit-daemon[1423]: Handling system-suspend using logind. Aug 18 19:52:51 T440s kwin_wayland_wrapper[1573]: No backend specified, automatically choosing drm Aug 18 20:03:58 T440s systemd-logind[1009]: The system will suspend now! Aug 18 20:03:58 T440s ModemManager[1189]: <msg> [sleep-monitor-systemd] system is about to suspend Aug 18 20:03:58 T440s systemd[1]: Starting systemd-suspend.service - System Suspend... Aug 18 20:03:58 T440s systemd-sleep[4653]: Performing sleep operation 'suspend'... Aug 18 20:03:58 T440s kernel: PM: suspend entry (deep) Aug 18 20:04:15 T440s kernel: printk: Suspending console(s) (use no_console_suspend to debug) Aug 18 20:04:15 T440s kernel: i915 0000:00:02.0: [drm] CPU PWM1 enabled Aug 18 20:04:15 T440s kernel: WARNING: drivers/gpu/drm/i915/display/intel_display_power.c:1225 at assert_can_disable_lcpll+0x741/0x760 [i915], CPU#3: kworker/u16:19/4673 Aug 18 20:04:15 T440s kernel: Modules linked in: nls_utf8 cifs nls_ucs2_utils cifs_md4 netfs rfcomm snd_seq_dummy snd_hrtimer snd_seq_midi snd_seq_midi_event snd_rawmidi snd_seq snd_seq_device ccm qrtr cmac algif_hash algif_skcipher af_alg bnep rmi_smbus rmi_core snd_hda_codec_intelhdmi snd_hda_codec_hdmi cmdlinepart spi_nor mtd at24 intel_rapl_msr uvcvideo snd_hda_codec_alc269 videobuf2_vmalloc snd_hda_codec_realtek_lib uvc btusb iwlmvm snd_ctl_led snd_hda_scodec_component videobuf2_memops btmtk snd_hda_codec_generic btrtl videobuf2_v4l2 mac80211 i2c_i801 intel_rapl_common videobuf2_common btbcm x86_pkg_temp_thermal intel_powerclamp videodev btintel snd_hda_intel rapl thinkpad_acpi spi_intel_platform libarc4 think_lmi i2c_smbus mei_pxp mei_hdcp spi_intel binfmt_misc intel_cstate firmware_attributes_class wmi_bmof i2c_mux snd_hda_codec bluetooth iwlwifi nvram mc i915 snd_hda_core snd_intel_dspcfg cfg80211 drm_buddy snd_intel_sdw_acpi ttm mei_me snd_hwdep drm_display_helper intel_smartconnect lpc_ich cec snd_pcm rc_core snd_timer mei Aug 18 20:04:15 T440s kernel: RIP: 0010:assert_can_disable_lcpll+0x747/0x760 [i915] Aug 18 20:04:15 T440s kernel: hsw_disable_lcpll.constprop.0+0x18/0x430 [i915] Aug 18 20:04:15 T440s kernel: hsw_enable_pc8+0x46/0xc0 [i915] Aug 18 20:04:15 T440s kernel: intel_display_power_suspend_late+0x69/0xf0 [i915] Aug 18 20:04:15 T440s kernel: ? intel_uncore_suspend+0x3d/0x50 [i915] Aug 18 20:04:15 T440s kernel: i915_drm_suspend_late+0x7e/0x100 [i915] Aug 18 20:04:15 T440s kernel: i915_pm_suspend_late+0x1d/0x40 [i915] Aug 18 20:04:15 T440s kernel: pm_generic_suspend_late+0x2b/0x40 Aug 18 20:04:15 T440s kernel: pci_pm_suspend_late+0x41/0x60 Aug 18 20:04:15 T440s kernel: ? __pfx_pci_pm_suspend_late+0x10/0x10 Aug 18 20:04:15 T440s kernel: device_suspend_late+0x114/0x2e0 Aug 18 20:04:15 T440s kernel: async_suspend_late+0x21/0x40 Aug 18 20:04:15 T440s kernel: i915 0000:00:02.0: [drm] PCH PWM1 enabled Aug 18 20:04:15 T440s kernel: WARNING: drivers/gpu/drm/i915/display/intel_display_power.c:1232 at assert_can_disable_lcpll+0x5e4/0x760 [i915], CPU#3: kworker/u16:19/4673 Aug 18 20:04:15 T440s kernel: Modules linked in: nls_utf8 cifs nls_ucs2_utils cifs_md4 netfs rfcomm snd_seq_dummy snd_hrtimer snd_seq_midi snd_seq_midi_event snd_rawmidi snd_seq snd_seq_device ccm qrtr cmac algif_hash algif_skcipher af_alg bnep rmi_smbus rmi_core snd_hda_codec_intelhdmi snd_hda_codec_hdmi cmdlinepart spi_nor mtd at24 intel_rapl_msr uvcvideo snd_hda_codec_alc269 videobuf2_vmalloc snd_hda_codec_realtek_lib uvc btusb iwlmvm snd_ctl_led snd_hda_scodec_component videobuf2_memops btmtk snd_hda_codec_generic btrtl videobuf2_v4l2 mac80211 i2c_i801 intel_rapl_common videobuf2_common btbcm x86_pkg_temp_thermal intel_powerclamp videodev btintel snd_hda_intel rapl thinkpad_acpi spi_intel_platform libarc4 think_lmi i2c_smbus mei_pxp mei_hdcp spi_intel binfmt_misc intel_cstate firmware_attributes_class wmi_bmof i2c_mux snd_hda_codec bluetooth iwlwifi nvram mc i915 snd_hda_core snd_intel_dspcfg cfg80211 drm_buddy snd_intel_sdw_acpi ttm mei_me snd_hwdep drm_display_helper intel_smartconnect lpc_ich cec snd_pcm rc_core snd_timer mei Aug 18 20:04:15 T440s kernel: RIP: 0010:assert_can_disable_lcpll+0x5ea/0x760 [i915] Aug 18 20:04:15 T440s kernel: hsw_disable_lcpll.constprop.0+0x18/0x430 [i915] Aug 18 20:04:15 T440s kernel: hsw_enable_pc8+0x46/0xc0 [i915] Aug 18 20:04:15 T440s kernel: intel_display_power_suspend_late+0x69/0xf0 [i915] Aug 18 20:04:15 T440s kernel: ? intel_uncore_suspend+0x3d/0x50 [i915] Aug 18 20:04:15 T440s kernel: i915_drm_suspend_late+0x7e/0x100 [i915] Aug 18 20:04:15 T440s kernel: i915_pm_suspend_late+0x1d/0x40 [i915] Aug 18 20:04:15 T440s kernel: pm_generic_suspend_late+0x2b/0x40 Aug 18 20:04:15 T440s kernel: pci_pm_suspend_late+0x41/0x60 Aug 18 20:04:15 T440s kernel: ? __pfx_pci_pm_suspend_late+0x10/0x10 Aug 18 20:04:15 T440s kernel: device_suspend_late+0x114/0x2e0 Aug 18 20:04:15 T440s kernel: async_suspend_late+0x21/0x40 Aug 18 20:04:15 T440s kernel: ACPI: PM: Low-level resume complete Aug 18 20:04:15 T440s kernel: xhci_hcd 0000:00:14.0: xHC error in resume, USBSTS 0x411, Reinit Aug 18 20:04:15 T440s systemd-sleep[4653]: System returned from sleep operation 'suspend'. Aug 18 20:04:15 T440s kernel: PM: suspend exit Aug 18 20:04:16 T440s systemd[1]: systemd-suspend.service: Deactivated successfully. Aug 18 20:04:16 T440s systemd[1]: Finished systemd-suspend.service - System Suspend. Aug 18 20:04:16 T440s systemd[1]: Reached target suspend.target - Suspend. Aug 18 20:04:16 T440s systemd[1]: Stopped target suspend.target - Suspend. Aug 18 20:04:16 T440s systemd-logind[1009]: Operation 'suspend' finished. Aug 18 20:04:16 T440s rtkit-daemon[1423]: Resumed scheduling 7 threads. ``` 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 CasperMD5CheckResult: unknown CurrentDesktop: KDE Date: Wed Aug 19 11:56:25 2026 InstallationDate: Installed on 2025-06-04 (441 days ago) InstallationMedia: Kubuntu 24.04.2 LTS "Noble Numbat" - Release amd64 (20250215) MachineType: LENOVO 20ARS1GX00 ProcFB: 0 i915drmfb ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-7.0.0-30-generic root=UUID=c6b8b31d-7408-4981-8844-9e50585c41a1 ro quiet splash 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 2026-04-28 (114 days ago) dmi.bios.date: 12/10/2013 dmi.bios.release: 2.17 dmi.bios.vendor: LENOVO dmi.bios.version: GJET67WW (2.17 ) dmi.board.asset.tag: Not Available dmi.board.name: 20ARS1GX00 dmi.board.vendor: LENOVO dmi.board.version: 0B98401 PRO dmi.chassis.asset.tag: 0784298 dmi.chassis.type: 10 dmi.chassis.vendor: LENOVO dmi.chassis.version: Not Available dmi.ec.firmware.release: 1.9 dmi.modalias: dmi:bvnLENOVO:bvrGJET67WW(2.17):bd12/10/2013:br2.17:efr1.9:svnLENOVO:pn20ARS1GX00:pvrThinkPadT440s:rvnLENOVO:rn20ARS1GX00:rvr0B98401PRO:cvnLENOVO:ct10:cvrNotAvailable:skuLENOVO_MT_20AR_BU_Think_FM_ThinkPadT440s:pfaThinkPadT440s: dmi.product.family: ThinkPad T440s dmi.product.name: 20ARS1GX00 dmi.product.sku: LENOVO_MT_20AR_BU_Think_FM_ThinkPad T440s dmi.product.version: ThinkPad T440s dmi.sys.vendor: LENOVO To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/2164569/+subscriptions
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