Package: src:linux Version: 6.12.63-1 Severity: normal X-Debbugs-Cc: [email protected]
Dear Maintainers, Screen backlight is not working on my Samsung N150 with Debian 13. After searching for possible solutions, I found a 2022 article from Hans de Goede explaining that he changed a lot of things on the backlight control for 6.1, so I made tests with kernel packages from snapshot.debian.org (see https://web.archive.org/web/20221107140732/https://hansdegoede.livejournal.com/26427.html). Indeed, if I boot with linux-image-6.0.0-5-amd64-unsigned (6.0.10-2), `/sys/class/backlight/intel_backlight/` exists, and I can control screen brightness with `/sys/class/backlight/intel_backlight/brightness`. And, if I boot with a newer kernel, from linux-image-6.1.0-0-amd64-unsigned (6.1~rc3-1~exp1) to linux-image-6.18.3+deb14-amd64-unsigned (6.18.3-1), `/sys/class/backlight/` only contains the directory `samsung`, which does not allow controlling the screen. Do not hesitate to ask if you want me to make some tests or if I can provide more information. Regards, Yvan -- Package-specific info: ** Kernel log: boot messages should be attached ** Model information sys_vendor: SAMSUNG ELECTRONICS CO., LTD. product_name: N150/N210/N220 product_version: Not Applicable chassis_vendor: SAMSUNG ELECTRONICS CO., LTD. chassis_version: N/A bios_vendor: Phoenix Technologies Ltd. bios_version: 08JI.M073.20100325.JIP board_vendor: SAMSUNG ELECTRONICS CO., LTD. board_name: N150/N210/N220 board_version: Not Applicable ** Configuration for modprobe: blacklist arkfb blacklist aty128fb blacklist atyfb blacklist radeonfb blacklist cirrusfb blacklist cyber2000fb blacklist kyrofb blacklist matroxfb_base blacklist mb862xxfb blacklist neofb blacklist pm2fb blacklist pm3fb blacklist s3fb blacklist savagefb blacklist sisfb blacklist tdfxfb blacklist tridentfb blacklist vt8623fb blacklist microcode options snd_pcsp index=-2 options cx88_alsa index=-2 options snd_atiixp_modem index=-2 options snd_intel8x0m index=-2 options snd_via82xx_modem index=-2 options bonding max_bonds=0 options dummy numdummies=0 options ifb numifbs=0 ** PCI devices: 00:00.0 Host bridge [0600]: Intel Corporation Atom Processor D4xx/D5xx/N4xx/N5xx DMI Bridge [8086:a010] Subsystem: Samsung Electronics Co Ltd Notebook N150P [144d:c072] Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx- Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort+ >SERR- <PERR- INTx- Latency: 0 Capabilities: <access denied> 00:02.0 VGA compatible controller [0300]: Intel Corporation Atom Processor D4xx/D5xx/N4xx/N5xx Integrated Graphics Controller [8086:a011] (prog-if 00 [VGA controller]) Subsystem: Samsung Electronics Co Ltd Notebook N150P [144d:c072] Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx- Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx- Latency: 0 Interrupt: pin A routed to IRQ 16 Region 0: Memory at f0300000 (32-bit, non-prefetchable) [size=512K] Region 1: I/O ports at 18d0 [size=8] Region 2: Memory at d0000000 (32-bit, prefetchable) [size=256M] Region 3: Memory at f0000000 (32-bit, non-prefetchable) [size=1M] Expansion ROM at 000c0000 [virtual] [disabled] [size=128K] Capabilities: <access denied> Kernel driver in use: i915 Kernel modules: i915 00:02.1 Display controller [0380]: Intel Corporation Atom Processor D4xx/D5xx/N4xx/N5xx Integrated Graphics Controller [8086:a012] Subsystem: Samsung Electronics Co Ltd Notebook N150P [144d:c072] Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx- Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx- Latency: 0 Region 0: Memory at f0380000 (32-bit, non-prefetchable) [size=512K] Capabilities: <access denied> 00:1b.0 Audio device [0403]: Intel Corporation NM10/ICH7 Family High Definition Audio Controller [8086:27d8] (rev 02) Subsystem: Samsung Electronics Co Ltd Notebook N150P [144d:c072] Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx+ Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx- Latency: 0, Cache Line Size: 32 bytes Interrupt: pin A routed to IRQ 26 Region 0: Memory at f0400000 (64-bit, non-prefetchable) [size=16K] Capabilities: <access denied> Kernel driver in use: snd_hda_intel Kernel modules: snd_hda_intel 00:1c.0 PCI bridge [0604]: Intel Corporation NM10/ICH7 Family PCI Express Port 1 [8086:27d0] (rev 02) (prog-if 00 [Normal decode]) Subsystem: Samsung Electronics Co Ltd Notebook N150P [144d:c072] Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx- Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx- Latency: 0, Cache Line Size: 32 bytes Interrupt: pin A routed to IRQ 16 Bus: primary=00, secondary=05, subordinate=05, sec-latency=0 I/O behind bridge: 3000-3fff [size=4K] [16-bit] Memory behind bridge: f0100000-f01fffff [size=1M] [32-bit] Prefetchable memory behind bridge: 80000000-801fffff [size=2M] [32-bit] Secondary status: 66MHz- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort+ <SERR- <PERR- BridgeCtl: Parity- SERR+ NoISA+ VGA- VGA16- MAbort- >Reset- FastB2B- PriDiscTmr- SecDiscTmr- DiscTmrStat- DiscTmrSERREn- Capabilities: <access denied> Kernel driver in use: pcieport 00:1c.1 PCI bridge [0604]: Intel Corporation NM10/ICH7 Family PCI Express Port 2 [8086:27d2] (rev 02) (prog-if 00 [Normal decode]) Subsystem: Samsung Electronics Co Ltd Notebook N150P [144d:c072] Control: I/O+ Mem+ BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx- Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx- Interrupt: pin B routed to IRQ 17 Bus: primary=00, secondary=07, subordinate=07, sec-latency=0 I/O behind bridge: 4000-4fff [size=4K] [16-bit] Memory behind bridge: 80200000-803fffff [size=2M] [32-bit] Prefetchable memory behind bridge: 80400000-805fffff [size=2M] [32-bit] Secondary status: 66MHz- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort+ <SERR- <PERR- BridgeCtl: Parity- SERR+ NoISA- VGA- VGA16- MAbort- >Reset- FastB2B- PriDiscTmr- SecDiscTmr- DiscTmrStat- DiscTmrSERREn- Capabilities: <access denied> Kernel driver in use: pcieport 00:1c.2 PCI bridge [0604]: Intel Corporation NM10/ICH7 Family PCI Express Port 3 [8086:27d4] (rev 02) (prog-if 00 [Normal decode]) Subsystem: Samsung Electronics Co Ltd Notebook N150P [144d:c072] Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx- Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx- Latency: 0, Cache Line Size: 32 bytes Interrupt: pin C routed to IRQ 18 Bus: primary=00, secondary=09, subordinate=09, sec-latency=0 I/O behind bridge: 2000-2fff [size=4K] [16-bit] Memory behind bridge: f0200000-f02fffff [size=1M] [32-bit] Prefetchable memory behind bridge: 80600000-807fffff [size=2M] [32-bit] Secondary status: 66MHz- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort+ <SERR- <PERR- BridgeCtl: Parity- SERR+ NoISA+ VGA- VGA16- MAbort- >Reset- FastB2B- PriDiscTmr- SecDiscTmr- DiscTmrStat- DiscTmrSERREn- Capabilities: <access denied> Kernel driver in use: pcieport 00:1c.3 PCI bridge [0604]: Intel Corporation NM10/ICH7 Family PCI Express Port 4 [8086:27d6] (rev 02) (prog-if 00 [Normal decode]) Subsystem: Samsung Electronics Co Ltd Notebook N150P [144d:c072] Control: I/O+ Mem+ BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx- Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx- Interrupt: pin D routed to IRQ 19 Bus: primary=00, secondary=0b, subordinate=0b, sec-latency=0 I/O behind bridge: 5000-5fff [size=4K] [16-bit] Memory behind bridge: 80800000-809fffff [size=2M] [32-bit] Prefetchable memory behind bridge: 80a00000-80bfffff [size=2M] [32-bit] Secondary status: 66MHz- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort+ <SERR- <PERR- BridgeCtl: Parity- SERR+ NoISA- VGA- VGA16- MAbort- >Reset- FastB2B- PriDiscTmr- SecDiscTmr- DiscTmrStat- DiscTmrSERREn- Capabilities: <access denied> Kernel driver in use: pcieport 00:1d.0 USB controller [0c03]: Intel Corporation NM10/ICH7 Family USB UHCI Controller #1 [8086:27c8] (rev 02) (prog-if 00 [UHCI]) Subsystem: Samsung Electronics Co Ltd Notebook N150P [144d:c072] Control: I/O+ Mem- BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx- Status: Cap- 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx- Latency: 0 Interrupt: pin A routed to IRQ 23 Region 4: I/O ports at 1820 [size=32] Kernel driver in use: uhci_hcd Kernel modules: uhci_hcd 00:1d.1 USB controller [0c03]: Intel Corporation NM10/ICH7 Family USB UHCI Controller #2 [8086:27c9] (rev 02) (prog-if 00 [UHCI]) Subsystem: Samsung Electronics Co Ltd Notebook N150P [144d:c072] Control: I/O+ Mem- BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx- Status: Cap- 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx- Latency: 0 Interrupt: pin B routed to IRQ 19 Region 4: I/O ports at 1840 [size=32] Kernel driver in use: uhci_hcd Kernel modules: uhci_hcd 00:1d.2 USB controller [0c03]: Intel Corporation NM10/ICH7 Family USB UHCI Controller #3 [8086:27ca] (rev 02) (prog-if 00 [UHCI]) Subsystem: Samsung Electronics Co Ltd Notebook N150P [144d:c072] Control: I/O+ Mem- BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx- Status: Cap- 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx- Latency: 0 Interrupt: pin C routed to IRQ 18 Region 4: I/O ports at 1860 [size=32] Kernel driver in use: uhci_hcd Kernel modules: uhci_hcd 00:1d.3 USB controller [0c03]: Intel Corporation NM10/ICH7 Family USB UHCI Controller #4 [8086:27cb] (rev 02) (prog-if 00 [UHCI]) Subsystem: Samsung Electronics Co Ltd Notebook N150P [144d:c072] Control: I/O+ Mem- BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx- Status: Cap- 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx- Latency: 0 Interrupt: pin D routed to IRQ 16 Region 4: I/O ports at 1880 [size=32] Kernel driver in use: uhci_hcd Kernel modules: uhci_hcd 00:1d.7 USB controller [0c03]: Intel Corporation NM10/ICH7 Family USB2 EHCI Controller [8086:27cc] (rev 02) (prog-if 20 [EHCI]) Subsystem: Samsung Electronics Co Ltd Notebook N150P [144d:c072] Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx- Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx- Latency: 0 Interrupt: pin A routed to IRQ 23 Region 0: Memory at f0604000 (32-bit, non-prefetchable) [size=1K] Capabilities: <access denied> Kernel driver in use: ehci-pci Kernel modules: ehci_pci 00:1e.0 PCI bridge [0604]: Intel Corporation 82801 Mobile PCI Bridge [8086:2448] (rev e2) (prog-if 01 [Subtractive decode]) Subsystem: Samsung Electronics Co Ltd Notebook N150P [144d:c072] Control: I/O+ Mem- BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx- Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx- Latency: 0 Bus: primary=00, secondary=11, subordinate=11, sec-latency=32 I/O behind bridge: [disabled] [16-bit] Memory behind bridge: [disabled] [32-bit] Prefetchable memory behind bridge: [disabled] [64-bit] Secondary status: 66MHz- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort+ <SERR- <PERR- BridgeCtl: Parity- SERR+ NoISA- VGA- VGA16- MAbort- >Reset- FastB2B- PriDiscTmr- SecDiscTmr- DiscTmrStat- DiscTmrSERREn- Capabilities: <access denied> 00:1f.0 ISA bridge [0601]: Intel Corporation NM10 Family LPC Controller [8086:27bc] (rev 02) Subsystem: Samsung Electronics Co Ltd Notebook N150P [144d:c072] Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx- Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx- Latency: 0 Capabilities: <access denied> Kernel driver in use: lpc_ich Kernel modules: lpc_ich 00:1f.2 SATA controller [0106]: Intel Corporation NM10/ICH7 Family SATA Controller [AHCI mode] [8086:27c1] (rev 02) (prog-if 01 [AHCI 1.0]) Subsystem: Samsung Electronics Co Ltd Notebook N150P [144d:c072] Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+ Status: Cap+ 66MHz+ UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx- Latency: 0 Interrupt: pin B routed to IRQ 25 Region 0: I/O ports at 18e8 [size=8] Region 1: I/O ports at 18dc [size=4] Region 2: I/O ports at 18e0 [size=8] Region 3: I/O ports at 18d8 [size=4] Region 4: I/O ports at 18c0 [size=16] Region 5: Memory at f0604400 (32-bit, non-prefetchable) [size=1K] Capabilities: <access denied> Kernel driver in use: ahci Kernel modules: ahci 00:1f.3 SMBus [0c05]: Intel Corporation NM10/ICH7 Family SMBus Controller [8086:27da] (rev 02) Subsystem: Samsung Electronics Co Ltd Notebook N150P [144d:c072] Control: I/O+ Mem- BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx- Status: Cap- 66MHz- UDF- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx- Interrupt: pin B routed to IRQ 19 Region 4: I/O ports at 18a0 [size=32] Kernel driver in use: i801_smbus Kernel modules: i2c_i801 05:00.0 Network controller [0280]: Qualcomm Atheros AR9285 Wireless Network Adapter (PCI-Express) [168c:002b] (rev 01) Subsystem: Askey Computer Corp. Device [144f:7167] Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx- Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx- Latency: 0, Cache Line Size: 32 bytes Interrupt: pin A routed to IRQ 16 Region 0: Memory at f0100000 (64-bit, non-prefetchable) [size=64K] Capabilities: <access denied> Kernel driver in use: ath9k Kernel modules: ath9k 09:00.0 Ethernet controller [0200]: Marvell Technology Group Ltd. 88E8040 PCI-E Fast Ethernet Controller [11ab:4354] Subsystem: Samsung Electronics Co Ltd Notebook N150P [144d:c072] Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B- DisINTx+ Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx- Latency: 0, Cache Line Size: 32 bytes Interrupt: pin A routed to IRQ 24 Region 0: Memory at f0200000 (64-bit, non-prefetchable) [size=16K] Region 2: I/O ports at 2000 [size=256] Capabilities: <access denied> Kernel driver in use: sky2 Kernel modules: sky2 ** USB devices: Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub Bus 001 Device 002: ID 0ac8:c33f Z-Star Microelectronics Corp. Webcam Bus 002 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 003 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 004 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub Bus 005 Device 001: ID 1d6b:0001 Linux Foundation 1.1 root hub -- System Information: Debian Release: 13.3 APT prefers stable-updates APT policy: (500, 'stable-updates'), (500, 'stable-security'), (500, 'stable') Architecture: amd64 (x86_64) Kernel: Linux 6.0.0-5-amd64 (SMP w/2 CPU threads; PREEMPT) Kernel taint flags: TAINT_UNSIGNED_MODULE Locale: LANG=fr_FR.UTF-8, LC_CTYPE=fr_FR.UTF-8 (charmap=UTF-8), LANGUAGE not set Shell: /bin/sh linked to /usr/bin/dash Init: systemd (via /run/systemd/system) LSM: AppArmor: enabled Versions of packages linux-image-6.12.63+deb13-amd64 depends on: ii initramfs-tools [linux-initramfs-tool] 0.148.3 ii kmod 34.2-2 ii linux-base 4.12 Versions of packages linux-image-6.12.63+deb13-amd64 recommends: ii apparmor 4.1.0-1 Versions of packages linux-image-6.12.63+deb13-amd64 suggests: pn debian-kernel-handbook <none> pn firmware-linux-free <none> ii grub-pc 2.12-9 pn linux-doc-6.12 <none> Versions of packages linux-image-6.12.63+deb13-amd64 is related to: pn firmware-amd-graphics <none> pn firmware-atheros <none> pn firmware-bnx2 <none> pn firmware-bnx2x <none> pn firmware-brcm80211 <none> pn firmware-cavium <none> pn firmware-cirrus <none> ii firmware-intel-graphics 20250410-2 pn firmware-intel-misc <none> pn firmware-intel-sound <none> pn firmware-ipw2x00 <none> pn firmware-ivtv <none> pn firmware-iwlwifi <none> pn firmware-libertas <none> pn firmware-marvell-prestera <none> pn firmware-mediatek <none> pn firmware-misc-nonfree <none> pn firmware-myricom <none> pn firmware-netronome <none> pn firmware-netxen <none> pn firmware-nvidia-graphics <none> pn firmware-qcom-soc <none> pn firmware-qlogic <none> pn firmware-realtek <none> pn firmware-samsung <none> pn firmware-siano <none> pn firmware-ti-connectivity <none> pn xen-hypervisor <none> -- no debconf information
