Public bug reported:
Today I noticed the brightness hotkeys (Fn-F11, Fn-F12) on my Dell
Latitude E7470 are not changing the brightness (contrast) in the screen.
The keys are detected, the feedback bar appears and changes, but the
brightness stays the same (full bright).
$ sudo evtest
No device specified, trying to scan all of /dev/input/event*
Available devices:
/dev/input/event0: Lid Switch
/dev/input/event1: Power Button
/dev/input/event10: HDA Intel PCH Headphone Mic
/dev/input/event11: HDA Intel PCH Dock Mic
/dev/input/event12: HDA Intel PCH Dock Line Out
/dev/input/event13: HDA Intel PCH HDMI/DP,pcm=3
/dev/input/event14: HDA Intel PCH HDMI/DP,pcm=7
/dev/input/event15: HDA Intel PCH HDMI/DP,pcm=8
/dev/input/event2: Sleep Button
/dev/input/event3: Power Button
/dev/input/event4: AT Translated Set 2 keyboard
/dev/input/event5: AlpsPS/2 ALPS DualPoint Stick
/dev/input/event6: AlpsPS/2 ALPS DualPoint TouchPad
/dev/input/event7: DELL Wireless hotkeys
/dev/input/event8: Dell WMI hotkeys
/dev/input/event9: Video Bus
Select the device event number [0-15]: 9
Input driver version is 1.0.1
Input device ID: bus 0x19 vendor 0x0 product 0x6 version 0x0
Input device name: "Video Bus"
Supported events:
Event type 0 (EV_SYN)
Event type 1 (EV_KEY)
Event code 224 (KEY_BRIGHTNESSDOWN)
Event code 225 (KEY_BRIGHTNESSUP)
Event code 227 (KEY_SWITCHVIDEOMODE)
Event code 241 (KEY_VIDEO_NEXT)
Event code 242 (KEY_VIDEO_PREV)
Event code 243 (KEY_BRIGHTNESS_CYCLE)
Event code 244 (KEY_BRIGHTNESS_ZERO)
Event code 245 (KEY_DISPLAY_OFF)
Properties:
Testing ... (interrupt to exit)
Event: time 1784612936.841528, type 1 (EV_KEY), code 224 (KEY_BRIGHTNESSDOWN),
value 1
Event: time 1784612936.841528, -------------- SYN_REPORT ------------
Event: time 1784612936.841542, type 1 (EV_KEY), code 224 (KEY_BRIGHTNESSDOWN),
value 0
Event: time 1784612936.841542, -------------- SYN_REPORT ------------
Event: time 1784612938.629528, type 1 (EV_KEY), code 225 (KEY_BRIGHTNESSUP),
value 1
Event: time 1784612938.629528, -------------- SYN_REPORT ------------
Event: time 1784612938.629539, type 1 (EV_KEY), code 225 (KEY_BRIGHTNESSUP),
value 0
Event: time 1784612938.629539, -------------- SYN_REPORT ------------
ProblemType: Bug
DistroRelease: Ubuntu 24.04
Package: udev 255.4-1ubuntu8.16
ProcVersionSignature: Ubuntu 7.0.0-28.28~24.04.1-generic 7.0.12
Uname: Linux 7.0.0-28-generic x86_64
ApportVersion: 2.28.2-0ubuntu0.1
Architecture: amd64
CasperMD5CheckResult: pass
CurrentDesktop: ubuntu:GNOME
CustomUdevRuleFiles: 70-snap.snapd.rules 70-snap.firmware-updater.rules
70-snap.snapd-desktop-integration.rules 70-snap.cups.rules
70-snap.snap-store.rules 70-snap.pinta.rules 70-snap.firefox.rules
70-snap.chromium.rules 70-snap.brave.rules
Date: Tue Jul 21 06:26:27 2026
InstallationDate: Installed on 2024-06-04 (776 days ago)
InstallationMedia: Ubuntu 24.04 LTS "Noble Numbat" - Release amd64 (20240424)
Lsusb:
Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
Bus 001 Device 002: ID 1bcf:2b91 Sunplus Innovation Technology Inc. Dell E5570
integrated webcam
Bus 001 Device 003: ID 0a5c:5834 Broadcom Corp. 5880
Bus 001 Device 004: ID 8087:0a2b Intel Corp. Bluetooth wireless interface
Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
MachineType: Dell Inc. Latitude E7470
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-7.0.0-28-generic
root=UUID=ed45d078-bbc4-4daa-acc7-5e1648d0ee0d ro quiet splash vt.handoff=7
SourcePackage: systemd
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 09/18/2022
dmi.bios.release: 1.36
dmi.bios.vendor: Dell Inc.
dmi.bios.version: 1.36.3
dmi.board.name: 0T6HHJ
dmi.board.vendor: Dell Inc.
dmi.board.version: A00
dmi.chassis.type: 9
dmi.chassis.vendor: Dell Inc.
dmi.modalias:
dmi:bvnDellInc.:bvr1.36.3:bd09/18/2022:br1.36:svnDellInc.:pnLatitudeE7470:pvr:rvnDellInc.:rn0T6HHJ:rvrA00:cvnDellInc.:ct9:cvr:sku06DC:pfaLatitude:
dmi.product.family: Latitude
dmi.product.name: Latitude E7470
dmi.product.sku: 06DC
dmi.sys.vendor: Dell Inc.
** Affects: systemd (Ubuntu)
Importance: Undecided
Status: New
** Tags: amd64 apport-bug noble wayland-session
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https://bugs.launchpad.net/bugs/2161394
Title:
Brightness hotkeys have no effect in Dell Laptop
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