Bug#702188: src:linux: [3.6 -> 3.7 regression] : Brightness control became ineffective
Package: src:linux
Version: 3.8-1~experimental.1
Severity: important
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Hi,
In kernel prior to 3.7 I used to control the brightness through
gnome-control-center (or writing a value in /sys/class/acpi_video0), but since
3.7 this is broken (ditto for the brightness function keys which are supported
since this version), unless I boot with the '!Windows 2012' kernel
parameter. I guess commit a57f7f9175b8 is the culprit, however I didn't
try to boot with it reverted yet.
Apart booting with the above kernel parameter, I guess it would be
possible to blacklist the "video" module in order to make the backlight
control fallback to intel_backlight.
Anyway, I don't know if this issue is exclusively the kernel fault or if
the firmware is at fault too. Also I didn't check if there was a
possibility to add a quirk for this system to avoid it to boot with
the Windows 2012 _OSI deleted.
Thanks and have a nice day,
Vincent
- -- System Information:
Debian Release: 7.0
APT prefers testing
APT policy: (990, 'testing'), (500, 'testing-updates'), (500, 'unstable'), (1, 'experimental')
Architecture: amd64 (x86_64)
Kernel: Linux 3.8-trunk-amd64 (SMP w/4 CPU cores)
Locale: LANG=fr_FR.utf8, LC_CTYPE=fr_FR.utf8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
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