Public bug reported:
Running 14.04, just upgraded. I can no longer adjust my backlight on my
ThinkPad T530. I am attaching a number of files as requested in
https://wiki.ubuntu.com/Kernel/Debugging/Backlight. See also:
http://askubuntu.com/questions/473660/brightness-keys-no-longer-work
Note that
apport information
** Attachment added: "CRDA.txt"
https://bugs.launchpad.net/bugs/1324529/+attachment/4122250/+files/CRDA.txt
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Title:
Backli
apport information
** Attachment added: "Lspci.txt"
https://bugs.launchpad.net/bugs/1324529/+attachment/4122254/+files/Lspci.txt
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Title:
Back
apport information
** Tags added: apport-collected third-party-packages
** Description changed:
Running 14.04, just upgraded. I can no longer adjust my backlight on my
ThinkPad T530. I am attaching a number of files as requested in
https://wiki.ubuntu.com/Kernel/Debugging/Backlight. See al
apport information
** Attachment added: "Dependencies.txt"
https://bugs.launchpad.net/bugs/1324529/+attachment/4122251/+files/Dependencies.txt
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apport information
** Attachment added: "HookError_source_linux_meta.txt"
https://bugs.launchpad.net/bugs/1324529/+attachment/4122252/+files/HookError_source_linux_meta.txt
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apport information
** Attachment added: "Lsusb.txt"
https://bugs.launchpad.net/bugs/1324529/+attachment/4122255/+files/Lsusb.txt
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Title:
Back
apport information
** Attachment added: "IwConfig.txt"
https://bugs.launchpad.net/bugs/1324529/+attachment/4122253/+files/IwConfig.txt
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Title:
apport information
** Attachment added: "ProcEnviron.txt"
https://bugs.launchpad.net/bugs/1324529/+attachment/4122257/+files/ProcEnviron.txt
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apport information
** Attachment added: "PulseList.txt"
https://bugs.launchpad.net/bugs/1324529/+attachment/4122260/+files/PulseList.txt
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Titl
apport information
** Attachment added: "ProcCpuinfo.txt"
https://bugs.launchpad.net/bugs/1324529/+attachment/4122256/+files/ProcCpuinfo.txt
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apport information
** Attachment added: "ProcInterrupts.txt"
https://bugs.launchpad.net/bugs/1324529/+attachment/4122258/+files/ProcInterrupts.txt
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https://bugs.launchpad.net/bugs/132
apport information
** Attachment added: "UdevLog.txt"
https://bugs.launchpad.net/bugs/1324529/+attachment/4122262/+files/UdevLog.txt
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Title:
apport information
** Attachment added: "UdevDb.txt"
https://bugs.launchpad.net/bugs/1324529/+attachment/4122261/+files/UdevDb.txt
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Title:
Ba
apport information
** Attachment added: "ProcModules.txt"
https://bugs.launchpad.net/bugs/1324529/+attachment/4122259/+files/ProcModules.txt
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Since the bug report failed to get dmesg for some permissions issues,
here it is.
** Attachment added: "dmesg"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1324529/+attachment/4122263/+files/dmesg
** Changed in: linux (Ubuntu)
Status: Incomplete => Confirmed
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Hi Joseph, I don't really feel comfortable installing a new kernel. I'm
adding the 'kernel-unable-to-test-upstream' tag.
** Tags added: kernel-unable-to-test-upstream
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This might be related to bug 1324529. On my Lenovo T530, there is only
thinkpad_screen in /sys/class/backlight. The fixes suggested here (the
acpi_backlight=vendor and 80-backlight.conf) do not fix the issue for me
and echoing numbers into /sys/class/backlight/thinkpad_screen/brightness
does nothin
Hi Christopher, some combination of removing all of the kernel boot
parameters and installing the nvidia drivers in ppa:xorg-edgers has
fixed the brightness issue. The hotkeys now correctly adjust it. Now,
there are 3 entries in /sys/class/backlight and echoing a number into
any of their ./brightne
Hi Christopher,
Sorry for the delays, I've been traveling. Do you want me to uninstall
nvidia-304 nvidia-current bumblebee-nvidia and see what happens?
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