[Karmic] SRU: Enable backlight control on certain laptops
tim.gardner at canonical.com
Mon Aug 31 14:12:05 UTC 2009
Stefan Bader wrote:
> SRU justification:
> Impact: Same problem as for current Jaunty: acpi checks for video
> devices by looking for certain methods but some broken BIOSes only
> define a subset of this. Some even do this only for a few of the
> multiple definitions (one is there for each potential hardware
> variation), so those machines had backlight control before Linux
> verified the PCI ID to be present.
> Fix: The following patch was sent upstream and ACKed, but not yet pulled
> into the kernel. Likely this takes until 2.6.32.
> Testcase: Tested by the reporters against a patched Jaunty kernel.
> Without the changes there is no backlight control. With it there is.
> When all other means of communication fail, try words!
Tim Gardner tim.gardner at canonical.com
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