On 23 Apr 2011, Camaleón wrote: > > > This is a laptop (6735s) and is over a year old so not very new. I don't > > think it has that "feature". > > > > It uses the radeon driver. > > You will find out in the BIOS screen. If the feature is there, there > should be an option to toggle it on/off under "system configuration menu/ > buit-in options" > > Also, check for a BIOS update, most of these "ACPI things" are usually > fixed after updating to the latest BIOS. >
Thanks, Camaleon. I found a lot of people using the same laptop with Windows who have the same problem. In some cases a bios upgrade fixed it, in others not. I tried to do this but it requires using an .exe file, and though I could do this with both wine and dosemu I couldn't obtain a suitable iso file to do the upgrade. (Also, I was a little afraid of ending up with an unbootable machine, which a few people report as happening.) BUT I have found that by unloading and reloading the video module (and/or the radeon module) I can sometimes obtain the requisite backlight file in /sys/devices/virtual .., after which the screen either becomes bright automatically or I can do it manually. So it seems to be something to do with the order in which the modules are loaded, though I can't figure out what. The effect is unpredictable - sometimes it works, sometimes not. Anthony -- Anthony Campbell - a...@acampbell.org.uk Microsoft-free zone - Using Debian GNU/Linux http://www.acampbell.org.uk - sample my ebooks at http://www.smashwords.com/profile/view/acampbell -- To UNSUBSCRIBE, email to debian-user-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org Archive: http://lists.debian.org/20110424094926.ga2...@acampbell.org.uk
