Hello, I've been thrashing about the internet looking for a solution to this problem but haven't encountered very many places that even agree on what the problem is.
Firstly I'll state the problem as clearly as I can:
When booting into Ubuntu 11.04 Natty Narwhal there is no back light to the laptop display. An image is produced and you can just make out the desktop and some of the brighter windows but there is no light behind the image to make it more visible.
This is NOT the contrast/brightness issue/bug and has nothing to do with the brightness settings or adjusting using the laptops function keys.
OK that's the problem, here's my setup:
I'm on an Acer Aspire 5736Z laptop. It uses an Intel GMA 4500M integrated GPU. I am booting from a liveUSB installation of Natty from todays (28th April) release i386-desktop image. I previously installed the beta2 version to disk (I had formatted the HDD at the time an figured I'd give it a spin) and the same issue occured so I'm relatively sure it doesn't matter that I'm booting from USB.
Here's what I've tried:
There's not a great deal I can do once Natty has started to boot because it's too dark to see very much. I have tried going to the ctrl-alt-f1 f2 f3 etc. consoles but they are also very dark. I am able to get an image with the nosetmode boot option but this isn't a perfect fix. The desktop defaults to gnome2 rather than unity and the resolution seems low and stretched (it's a wide screen laptop). Going to the System> Preferences> Monitors tool doesn't allow any changes to the resolution or refresh rate (which for some reason claims to be 0).
I have checked the Additional Driver installer and it doesn't find any additional drivers. My display works fine under 10.10 out of the box (perhaps a little bad for 3D but then it is Intel so that's expected).
If folks need more details I'm happy to get them if you tell me exactly what it is you're looking for. Bear in mind I'll either need to use nomodeset or sit in a dark cupboard.