https://bugzilla.kernel.org/show_bug.cgi?id=29812
Summary: Brightness levels too low on Dell Inspiron 13" Intel
HD 4 Series
Product: ACPI
Version: 2.5
Kernel Version: 2.6.38-rc6
Platform: All
OS/Version: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: Power-Video
AssignedTo: acpi_power-vi...@kernel-bugs.osdl.org
ReportedBy: nik...@komani.de
Regression: Yes
My Brightness levels when running 2.6.38-rc6 are much to low, I can change them
with the fn keys and /sys/devices/virtual/backlight/acpi_video0 but even the
highest setting 15 is far to low and barely readable indoors.
I've been running 2.6.37.1 where it works this is the first rc I tested.
My video adapter is reported by lspci as
00:02.0 VGA compatible controller: Intel Corporation Mobile 4 Series Chipset
Integrated Graphics Controller (rev 07) (prog-if 00 [VGA controller])
Subsystem: Dell Device 0418
Flags: bus master, fast devsel, latency 0, IRQ 46
Memory at f0000000 (64-bit, non-prefetchable) [size=4M]
Memory at d0000000 (64-bit, prefetchable) [size=256M]
I/O ports at 1800 [size=8]
Expansion ROM at <unassigned> [disabled]
Capabilities: [90] MSI: Enable+ Count=1/1 Maskable- 64bit-
Capabilities: [d0] Power Management version 3
Kernel driver in use: i915
Kernel modules: i915
00:02.1 Display controller: Intel Corporation Mobile 4 Series Chipset
Integrated Graphics Controller (rev 07)
Subsystem: Dell Device 0418
Flags: bus master, fast devsel, latency 0
Memory at f0400000 (64-bit, non-prefetchable) [size=1M]
Capabilities: [d0] Power Management version 3
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