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2009/10/12 Stefan Bader <stefan.ba...@canonical.com> > @Pablo, looking at your dmesg it seems you got the option correctly set and > it > is using the less restrictive mode for the brightness control. So acer-wmi > leaves that untouched. Now, when running exactly that mode, can you do a > "sudo > grep -r . /proc/acpi/video" and attach that output as well? > > -- > Acer: Cannot change brightness with 2.6.27-11+ kernel > https://bugs.launchpad.net/bugs/333386 > You received this bug notification because you are a direct subscriber > of a duplicate bug. > > Status in “linux” package in Ubuntu: Fix Released > Status in linux in Ubuntu Intrepid: Fix Released > Status in linux in Ubuntu Jaunty: Fix Released > Status in linux in Ubuntu Karmic: Fix Released > > Bug description: > SRU justification: > > Impact: After I carelessly pulled in some updates to the ACPI video code, > we were faced with some regressions. One was (at least) a certain Acer > laptop model that suddenly had no backlight control. > > Fix: As the ACPI BIOS is broken on a way that only the *wrong* graphics > definition will be accepted by acpi-video as the right definition lacks an > attribute to be considered, the fix is to have less strict requirements to > that check, so the definition for the right graphics device gets accepted (a > patch doing that unconditionally, has been submitted upstream and has been > acked, but might not make it until 2.6.32). For the stable tree I created > more code which makes sure the less strict tests only take effect on that > laptop or when the user really wants to. > > Testcase: Booting on another laptop will not activate the code (which > prints a "Using less strict video detection..." message) but will do with > "acpi_video_strict_detect=0". In both cases nothing bad happened. The > affected laptop boots and selects the new check which gives back the > backlight control. > > --- > > Since the 2.6.27-11 generic kernel (also in 2.6.27-12) I cannot change the > backlight brightness anymore. In the latest kernel, it seems there's no more > file in /proc/acpi/video, but GFX0 still apears in 2.6.27-9 where I can > still change brightness. I'm new to linux so if you need information give me > the command to run. It's an acer 6920G laptop. > ** Attachment added: "grep" http://launchpadlibrarian.net/33588369/grep -- Acer: Cannot change brightness with 2.6.27-11+ kernel https://bugs.launchpad.net/bugs/333386 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs