Comment 34 for bug 954661

@lrbabe- As has been documented in this bug report, the Sputnik kernel is constructed and tested specifically for the Dell XPS 13. Users have reported that it is also beneficial for some other laptop models, but it is not expected to fix all Intel-graphics laptops with non-functional brightness controls. Given your result, it is not likely that the fixes would be relevant for your Sony Vaio T13 anyway, regardless of the backlight-off-at-boot problem. There is always some risk associated with installing any alternative kernel.