[Virtual-pkg-base-maintainers] Bug#642805: base: kernel modesetting bug in wheezy. Blackscreen after init starts and udev runs

[Edward]

Package: base
Severity: important


Wheezy kernel modesetting bug.

I found a workaround for this bug and I am now convinced the bug has nothing to do with modesetting. It is rather a bug that is caused by a failure of the kernel to turn on the back light of the laptop (Acer Aspire 7715z).

The workarounds:
a) use acpi_osi=Linux as a kernel parameter and press Fn + Left Arrow to turn the back light on when it is incorrectly turned off by the kernel.

b) use the command as root: setpci -s 00:02.0 F4.B=00 The above command can be 
included in a startup script.

Thanks.

-- System Information:
Debian Release: 6.0.2
  APT prefers stable
  APT policy: (500, 'stable')
Architecture: i386 (i686)

Kernel: Linux 2.6.32-5-686 (SMP w/2 CPU cores)
Locale: LANG=en_GB.UTF-8, LC_CTYPE=en_GB.UTF-8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash