https://bugzilla.kernel.org/show_bug.cgi?id=221580
Bug ID: 221580
Summary: [REGRESSION] Fn brightness keys stopped working on HP
Elitebook 840 G3 (sysfs brightness works)
Product: ACPI
Version: 2.5
Hardware: All
OS: Linux
Status: NEW
Severity: normal
Priority: P3
Component: Power-Video
Assignee: [email protected]
Reporter: [email protected]
Regression: No
Fn brightness keys used to work on my HP Elitebook 840 G3, until kernel version
4.19.208. Then from version 5.4.150 on they stopped working. Recently tested
with 6.18.33, still not working, same ACPI errors.
I can still change brightness through sysfs...
In older kernels where it stopped working I get these ACPI errors:
$ dmesg | grep -i error
[ 3.341400] ACPI Error: AE_ERROR, Returned by Handler for [PCI_Config]
(20210604/evregion-281)
[ 3.341411] ACPI Error: Aborting method \_SB.PCI0.RP02.PXP._ON due to
previous error (AE_ERROR) (20210604/psparse-529)
[ 3.398393] ACPI Error: AE_ERROR, Returned by Handler for [PCI_Config]
(20210604/evregion-281)
[ 3.398401] ACPI Error: Aborting method \_SB.PCI0.RP02.PXP._OFF due to
previous error (AE_ERROR) (20210604/psparse-529)
Newer non-working kernel:
# dmesg | grep -i error
[ 3.131025] ACPI Error: AE_ERROR, Returned by Handler for [PCI_Config]
(20250807/evregion-303)
[ 3.131037] ACPI Error: Aborting method \_SB.PCI0.RP02.PXP._ON due to
previous error (AE_ERROR) (20250807/psparse-529)
[ 4963.022642] ACPI Error: AE_ERROR, Returned by Handler for [PCI_Config]
(20250807/evregion-303)
[ 4963.022669] ACPI Error: Aborting method \_SB.PCI0.RP02.PXP._OFF due to
previous error (AE_ERROR) (20250807/psparse-529)
$ lspci -k
00:00.0 Host bridge: Intel Corporation Xeon E3-1200 v5/E3-1500 v5/6th Gen Core
Processor Host Bridge/DRAM Registers (rev 08)
Subsystem: Hewlett-Packard Company EliteBook 840 G3
Kernel driver in use: skl_uncore
lspci: Unable to load libkmod resources: error -2
00:02.0 VGA compatible controller: Intel Corporation Skylake GT2 [HD Graphics
520] (rev 07)
DeviceName: Onboard IGD
Subsystem: Hewlett-Packard Company EliteBook 840 G3
Kernel driver in use: i915
00:14.0 USB controller: Intel Corporation Sunrise Point-LP USB 3.0 xHCI
Controller (rev 21)
Subsystem: Hewlett-Packard Company EliteBook 840 G3
Kernel driver in use: xhci_hcd
00:14.2 Signal processing controller: Intel Corporation Sunrise Point-LP
Thermal subsystem (rev 21)
Subsystem: Hewlett-Packard Company EliteBook 840 G3
00:15.0 Signal processing controller: Intel Corporation Sunrise Point-LP Serial
IO I2C Controller #0 (rev 21)
Subsystem: Hewlett-Packard Company EliteBook 840 G3
00:16.0 Communication controller: Intel Corporation Sunrise Point-LP CSME HECI
#1 (rev 21)
Subsystem: Hewlett-Packard Company EliteBook 840 G3
00:17.0 SATA controller: Intel Corporation Sunrise Point-LP SATA Controller
[AHCI mode] (rev 21)
Subsystem: Hewlett-Packard Company EliteBook 840 G3
Kernel driver in use: ahci
00:1c.0 PCI bridge: Intel Corporation Sunrise Point-LP PCI Express Root Port #2
(rev f1)
Kernel driver in use: pcieport
00:1c.3 PCI bridge: Intel Corporation Sunrise Point-LP PCI Express Root Port #4
(rev f1)
Kernel driver in use: pcieport
00:1f.0 ISA bridge: Intel Corporation Sunrise Point-LP LPC Controller (rev 21)
Subsystem: Hewlett-Packard Company EliteBook 840 G3
00:1f.2 Memory controller: Intel Corporation Sunrise Point-LP PMC (rev 21)
Subsystem: Hewlett-Packard Company EliteBook 840 G3
00:1f.3 Audio device: Intel Corporation Sunrise Point-LP HD Audio (rev 21)
Subsystem: Hewlett-Packard Company EliteBook 840 G3
Kernel driver in use: snd_hda_intel
00:1f.4 SMBus: Intel Corporation Sunrise Point-LP SMBus (rev 21)
Subsystem: Hewlett-Packard Company EliteBook 840 G3
Kernel driver in use: i801_smbus
00:1f.6 Ethernet controller: Intel Corporation Ethernet Connection I219-V (rev
21)
Subsystem: Hewlett-Packard Company Ethernet Connection I219-V
Kernel driver in use: e1000e
01:00.0 Unassigned class [ff00]: Realtek Semiconductor Co., Ltd. RTS522A PCI
Express Card Reader (rev ff)
02:00.0 Network controller: Intel Corporation Wireless 8260 (rev 3a)
Subsystem: Intel Corporation Dual Band Wireless-AC 8260
Kernel driver in use: iwlwifi
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