On Thu, May 02, 2013 at 05:23:42AM -0400, giri wrote:
> Package: general
> Severity: normal
>
> Dear Maintainer,
> *** Please consider answering these questions, where appropriate ***
>
> * What led up to the situation?
> while adjusting screen brightness
>
> * What exactly did you do (or not do) that was effective (or
> ineffective)?
> used laptop dedicated buttons to adjust screen brightness
>
> * What was the outcome of this action?
> system freeze
>
> * What outcome did you expect instead?
> screen brightness to be adjusted without problems
I had the same problem a while ago on a Dell Inspiron N5010, and I was able to
work around it by using the following configuration in /etc/default/grub
GRUB_CMDLINE_LINUX="acpi_backlight=vendor"
There is actually an open kernel bug report regarding this issue in
bugzilla.kernel.org:
[1] https://bugzilla.kernel.org/show_bug.cgi?id=15895
Based on the discussions on that thread, you may also want to try the following
kernel boot parameter, if the one above is not effective:
pcie_aspm=force
For me, the second one was irrelevant, and the issue has gone by only including
acpi_backlight=vendor. Note, however, that this workarounds are not reliable
across all systems with intel graphics. They might fix the issue on some
systems, but are completely useless on others, so I hope this helps in your
case.
--
Marwan
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