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Bug#734003: linux-image-3.13-rc6-amd64: Display manager fails to start, Intel graphics driver not loaded/used, brightness conrtols reversed



Hi Alex,

On Thu, 02 Jan 2014 19:33:04 -0500, Alex Vanderpol <karashata@gmail.com>
wrote:
> Package: src:linux
> Version: 3.13~rc6-1~exp1
> Severity: important
> 
> Dear Maintainer,
> 
> This package (version 3.13~rc6-1~exp1) is exhibiting some symptoms that
> lead me to believe it's buggy, namely:
> 
> 1: My display manager (GDM) fails to start when the system finishes booting.
> 2: The Intel graphics driver does not appear to be loaded/used (possibly the
> reason for #1). Instead, the driver "Gallium 0.4 on llvmpipe (LLVM 3.3, 128
> bits)" is used.
> 3: For some reason, the brightness controls end up reversed (trying to lower
> the brightness raises it, and vice-versa), causing my display to be turned
> off rather than turned up to full brightness when the system finishes
> booting (possibly also related to #2).

Did you try reproducing this with Linux 3.14?

For your #3, you should try passing i915.invert_brightness=1 to the kernel
when booting (press E in Grub and add this at the end of the "linux" line),
it should solve the problem. I've read somewhere that if your machine requires
this you should report it, but I don't remember where so.

Hope this helps,
  Matteo

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