[Bug 1054298] Re: xbacklight doesn't work, but xrandr does and so does /sys/class/backlight
for ubuntu 16.04 on HP pavilion dv6 and Nvidia Graphic driver, the problem is the same. xbacklight -set 100 > NOT WORKS xrandr --output LVDS-0 --set Backlight 100> NOT WORKS xrandr --output LVDS-0 --brightness 1 > WORKS(IT HAS A DIFFERENT EFFECT!) echo 1 |sudo tee /sys/class/backlight/acpi_video0/brightness > WORKS -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1054298 Title: xbacklight doesn't work, but xrandr does and so does /sys/class/backlight To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1054298/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1054298] Re: xbacklight doesn't work, but xrandr does and so does /sys/class/backlight
Everything I wrote above is still true for me in 14.04, Trusty, 64 bit version, with pretty much the same setup, plain Openbox (no LXDE, no Lubuntu, no other DE) and lxterminal. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1054298 Title: xbacklight doesn't work, but xrandr does and so does /sys/class/backlight To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1054298/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1054298] Re: xbacklight doesn't work, but xrandr does and so does /sys/class/backlight
Still doesn't work in Saucy. For me, none of the following, cause any change in screen appearance, nor to they bring any response in lxterminal other than a new prompt: xbacklight -get xbacklight -set 100 -time 0 xbacklight -set 20 -time 0 xbacklight -set 2 -time 0 Running Saucy in plain openbox, no lxde other than lxterminal. Also, as an aside, I think #4 may be misleading in saying "The xrandr program also works fine." These commands work fine: [code] # Sets the "brightness" (i.e., thev transparency) of the LCD layer very dark: xrandr --output VGA-0 --brightness 0.1 # Legitimate values are 0 to 1 # Sets the "brightness" (i.e., thev transparency) of the LCD layer all the way up: xrandr --output VGA-0 --brightness 1 [/code] but, unless I've misunderstood man xrandr they DO NOT affect the actual brightness of the backlight. In a well lit room, the effect looks very similar, but in a dark room the difference should be apparent. It may be I haven't figured out the syntax correctly, but for me in Saucy, none of these do anything: [code] xrandr --output VGA-0 --set backlight 50 xrandr --output LVDS-0 --set backlight 50 xrandr --output --auto --set backlight 50 xrandr --output auto --set backlight 50 [/code] -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1054298 Title: xbacklight doesn't work, but xrandr does and so does /sys/class/backlight To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1054298/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1054298] Re: xbacklight doesn't work, but xrandr does and so does /sys/class/backlight
[Expired for linux (Ubuntu) because there has been no activity for 60 days.] ** Changed in: linux (Ubuntu) Status: Incomplete => Expired -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1054298 Title: xbacklight doesn't work, but xrandr does and so does /sys/class/backlight To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1054298/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1054298] Re: xbacklight doesn't work, but xrandr does and so does /sys/class/backlight
/sys/class/backlight/psb-bl/brightness works fine. The xrandr program also works fine. This script, which uses either of those, works fine. http://code.google.com/p/bltool/ Only xbacklight doesn't, and at least some other things, such as the backlight module in enlightenment 17. -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1054298 Title: xbacklight doesn't work, but xrandr does and so does /sys/class/backlight To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1054298/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1054298] Re: xbacklight doesn't work, but xrandr does and so does /sys/class/backlight
Would it be possible for you to test the latest upstream kernel? Refer to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest v3.6 kernel[0] (Not a kernel in the daily directory) and install both the linux-image and linux-image-extra .deb packages. Once you've tested the upstream kernel, please remove the 'needs- upstream-testing' tag. Please only remove that one tag and leave the other tags. This can be done by clicking on the yellow pencil icon next to the tag located at the bottom of the bug description and deleting the 'needs-upstream-testing' text. If this bug is fixed in the mainline kernel, please add the following tag 'kernel-fixed-upstream'. If the mainline kernel does not fix this bug, please add the tag: 'kernel-bug-exists-upstream'. If you are unable to test the mainline kernel, for example it will not boot, please add the tag: 'kernel-unable-to-test-upstream'. Once testing of the upstream kernel is complete, please mark this bug as "Confirmed". Thanks in advance. [0] http://kernel.ubuntu.com/~kernel-ppa/mainline/v3.6-rc7-quantal/ ** Changed in: linux (Ubuntu) Importance: Undecided => Medium ** Tags added: needs-upstream-testing -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1054298 Title: xbacklight doesn't work, but xrandr does and so does /sys/class/backlight To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1054298/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
[Bug 1054298] Re: xbacklight doesn't work, but xrandr does and so does /sys/class/backlight
Thank you for taking the time to report this bug and helping to make Ubuntu better. Please execute the following command, as it will automatically gather debugging information, in a terminal: apport-collect 1054298 When reporting bugs in the future please use apport by using 'ubuntu- bug' and the name of the package affected. Please include the information requested at https://wiki.ubuntu.com/Kernel/Debugging/Backlight as separate attachments. You can learn more about this functionality at https://wiki.ubuntu.com/ReportingBugs. ** Package changed: ubuntu => linux (Ubuntu) ** Changed in: linux (Ubuntu) Status: New => Incomplete -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1054298 Title: xbacklight doesn't work, but xrandr does and so does /sys/class/backlight To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1054298/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs
