Peter Clifton wrote: > On Thu, 2007-08-16 at 18:34 -0500, Ryan May wrote: >> Hi, >> >> I recently updated the BIOS on my HP Pavilion dv2125nr laptop to F.34 >> (to enable the virtualization instructions). Since I did this, the Fn >> keys to control brightness have failed to work properly under Linux, >> though they work fine before booting (ie. at Grub). Hitting the Fn keys >> caused the brightness to change to the minimum possible. In fact, >> /proc/acpi/video/VGA/LCD/brightness would show that the level was set to >> 0 (though 20 was the lowest available). I was still able to control the >> brightness manually via /proc interface however. >> >> My investigations seem to indicate that HP, in their wisdom, seem to >> have removed the _BQC method from their BIOS code. It seems that the >> ACPI code in Linux that handles the key events to change the brightness >> use the _BQC method without checking for success, which explains why the >> level being set was garbage. However, the /proc interface for >> brightness seems to only use device->brightness->curr to get the current >> level. > > Do you happen to see a _BCQ method in the DSDT instead? My HP nc6320 has > that, and last time I looked, it seemed like it could plausibly be a > Microsoft induced rename / typo, as this method is mentioned for getting > brightness on a Windows Vista compatible box. I didn't see it, but I'm new to trying to track down things in the DSDT, so it's quite possible I missed it. I've attached a gzipped acpidump. > Did the bios update also mention any fixes for Vista compatibility? None of the versions between my old BIOS and the one I have now mention Vista. Ryan -- Ryan May Graduate Research Assistant School of Meteorology University of Oklahoma
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acpi.dump.gz
Description: GNU Zip compressed data
