I can see sonypi: error messages in the dmesg output. There really seems
to be a problem.
Could you please post the output of this command line:
---
grep . -r /var/lib/acpi-support/*-*
---
** Changed in: acpi-support (Ubuntu)
Status: Unconfirmed => Needs Info
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no brightness control in sony vaio vgn-fe31b
https://bugs.launchpad.net/bugs/115525
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