http://bugzilla.kernel.org/show_bug.cgi?id=13048
Summary: /sys/class/backlight/acpi_video0/* is gone on vaio
laptop with Intel GM45.
Product: ACPI
Version: 2.5
Kernel Version: 2.6.30-rc1
Platform: All
OS/Version: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: Power-Video
AssignedTo: [email protected]
ReportedBy: [email protected]
Regression: Yes
Laptop: Sony Vaio VGN-FW235J
Graphics: Intel GM45 - 4500MHD
The commit 74a365b3f354fafc537efa5867deb7a9fadbfe27 broken my
/sys/class/backlight/acpi_video0/*
commit 74a365b3f354fafc537efa5867deb7a9fadbfe27
Author: Matthew Garrett <[email protected]>
Date: Thu Mar 19 21:35:39 2009 +0000
ACPI: Populate DIDL before registering ACPI video device on Intel
Intel graphics hardware that implements the ACPI IGD OpRegion spec
requires that the list of display devices be populated before any ACPI
video methods are called. Detect when this is the case and defer
registration until the opregion code calls it. Fixes crashes on HP
laptops.
http://bugzilla.kernel.org/show_bug.cgi?id=11259
Signed-off-by: Matthew Garrett <[email protected]>
Acked-by: Eric Anholt <[email protected]>
Signed-off-by: Len Brown <[email protected]>
Reverting the patch I see the files again (actual_brightness, brightness,
max_brightness..)
Note: On boot, I see:
[Firmware Bug]: ACPI: ACPI brightness control misses _BQC function
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