It now became possible to boot a live DVD of the latest development release of ubuntu (64 bit) on my HP ZBook. I installed this system of the machine's HDD. I have applied all available updates via the UpdateManager.
The brightenss problem remains. Afterwards I tested also the latest mainline kernel, i.e. file linux-image-3.13.1-031301-generic_3.13.1-031301.201401291035_amd64.deb (Of course, I rebooted the machine after having the kernel installed.) Even with the newest kernel it remains impossible to controll brightness using the tool in the Control Centre. The other "official" way to control brightness should be the Fn F9 and Fn F10 key combinations. I can see that pressing _either_ of these key pairs has the effect of immediate maximisation of brightness. No way to decrease it. I can still controll brightness (fortunatelly) using the workaround proposed by ebutler (see above). In its essence it is done by variation of the number written in file /sys/class/backlight/intel_backlight/brightness I my opinion this bug should be easy to fix bacause it looks to be only the issue of the desktop environment. BTW, even if I set brightness to an acceptably low value for me, it remains at this value only untill the screensaver is started. Pressing a key (to cancel the screensaver) turns the brighteness to its maximum. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1257766 Title: can not reduce brightness on HP ZBook 15 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1257766/+subscriptions -- ubuntu-bugs mailing list [email protected] https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
