https://bugzilla.kernel.org/show_bug.cgi?id=29882
Summary: LCD backlight brightness too low to be useable, though
changeable
Product: ACPI
Version: 2.5
Kernel Version: 2.6.38-c6
Platform: All
OS/Version: Linux
Tree: Mainline
Status: NEW
Severity: high
Priority: P1
Component: Power-Video
AssignedTo: [email protected]
ReportedBy: [email protected]
CC: [email protected]
Regression: Yes
When running 2.6.38-rc6 from mainline my Dell Inspiron 13" boots up fine but
the brightness level is too low to be useable, its barely readable at indoor
conditions. However I can change the the value with /sys/class.. and with the
hotkeys still it's in the range between nearly off (value 0) to barely readable
(value 15 which is reported as maximum)
This seems to be a regression as it works with bot 2.6.37 and 2.6.37.1
Here is what lspci says about my video related hardware
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 43
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: <access denied>
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-prefetch
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