I've also a clean install with Ubuntu 13.04 64bit, and the back-light
control is working with the latest kernel, also I've the latest bios
installed A08.
So lets compare the settings for the bios,
mine are:
Advanced
Intel (R) SpeedStep (tm) Enabled
Virtualization Enabled
USB Emulation Enabled
USB Powershare Enabled
USB Wake Support Disabled
SATA Operation AHCI
Function Key Behavior Function Key
Intel (R) Smart Connect Technology Enabled
Miscekkaneous Devices
External USB Ports Enabled
USB debug Disabled
Security
Secure Boot Configuration
Protected Signatures Enabled (User Mode)
Customized Signatures Disabled (Standard Mode)
CertNames Win8 Certificates
Set Asset Tag Enter
Admin Password is: Cleared
System Password is: Cleared
HDD Password State: Cleared
Set Admin Password Enter
Set System Password Enter
Set HDD Password Enter
Password change: Permitted
Computrace: Deactivated
TPM Security Disabled
TPM Activation Deactivated
Boot
Boot Priority Order
UEFI Boot:
ubuntu
Network boot
Secure Boot Disabled
Load Lagacy Option Rom Disabled
Boot List Option UEFI
I hope for you all to find here a solution.
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https://bugs.launchpad.net/bugs/1169376
Title:
XPS13 backlight stopped working after update 3.8.0-18.28
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