https://bugzilla.kernel.org/show_bug.cgi?id=43231
Summary: black screen on sonyvaio vpccw1
Product: ACPI
Version: 2.5
Kernel Version: 3.4
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: black_painkil...@yahoo.it
Regression: Yes
https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-nouveau/+bug/984866
I though it was a nouveau problem but they told me it's from ACPI.
Also, on 3.3 backlight is reported as software , on 3.4 kernel thinks it is
hardware and so nouveau does not enable control over it
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