** Tags added: bios-outdated-1301
** Changed in: linux (Ubuntu)
Importance: Medium => Low
** Summary changed:
- Screen brightness cannot be adjusted on ASUS Eeepc 1015PEM
+ [ASUS Eeepc 1015PEM] Screen brightness cannot be adjusted
** Tags added: needs-reverse-bisect
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Tested with mainline kernel (linux-image-3.15.0-031500rc2-generic) -
Both hotkeys and the Brightness slider in the Brightness & Lock settings
dialogue change the screen brightness correctly.
** Tags added: kernel-fixed-upstream
** Changed in: linux (Ubuntu)
Status: Incomplete => Confirmed
** Attachment added: "video"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1311297/+attachment/4095650/+files/video
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Title:
Screen bri
** Attachment added: "ssdt9.dat"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1311297/+attachment/4095645/+files/ssdt9.dat
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Title:
Sc
** Attachment added: "lslabacklight"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1311297/+attachment/4095652/+files/lslabacklight
** Description changed:
This is a regression. Up to 13.10 there was no problem changing screen
- bightness on my Asus Eeepc 1015PEM. This machine has
** Attachment added: "vendorbacklight"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1311297/+attachment/4095651/+files/vendorbacklight
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** Attachment added: "dsdt.dat"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1311297/+attachment/4095602/+files/dsdt.dat
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Title:
Scre
** Attachment added: "ssdt3.dat"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1311297/+attachment/4095615/+files/ssdt3.dat
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Title:
Sc
** Attachment added: "ssdt7.dat"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1311297/+attachment/4095643/+files/ssdt7.dat
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Title:
Sc
** Attachment added: "ssdt8.dat"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1311297/+attachment/4095644/+files/ssdt8.dat
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Title:
Sc
** Attachment added: "fwts"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1311297/+attachment/4095604/+files/fwts
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Title:
Screen brigh
** Attachment added: "ssdt5.dat"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1311297/+attachment/4095617/+files/ssdt5.dat
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Title:
Sc
** Attachment added: "version"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1311297/+attachment/4095646/+files/version
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Title:
Screen
** Attachment added: "ssdt1.dat"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1311297/+attachment/4095609/+files/ssdt1.dat
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Title:
Sc
** Attachment added: "fwts_method"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1311297/+attachment/4095605/+files/fwts_method
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Title:
** Attachment added: "dsdt.dsl"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1311297/+attachment/4095603/+files/dsdt.dsl
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Title:
Scre
** Attachment added: "ssdt6.dat"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1311297/+attachment/4095642/+files/ssdt6.dat
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Title:
Sc
** Attachment added: "backlight"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1311297/+attachment/4095600/+files/backlight
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Title:
Sc
** Attachment added: "results.log"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1311297/+attachment/4095606/+files/results.log
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Title:
** Attachment added: "ssdt2.dat"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1311297/+attachment/4095610/+files/ssdt2.dat
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Title:
Sc
** Attachment added: "ssdt4.dat"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1311297/+attachment/4095616/+files/ssdt4.dat
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Title:
Sc
Backlight debugging as per link supplied by jpds.
Backlight control does not work, but there are entries in
/sys/class/backlight.
Debugging information collected and attached.
Testing for work around:
After reboot with only the kernel parameter acpi_backlight=vendor:
The function keys (hotkeys
** Attachment added: "dmidecode.log"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1311297/+attachment/4095601/+files/dmidecode.log
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Tit
** Attachment added: "acpidump.txt"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1311297/+attachment/4095599/+files/acpidump.txt
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Title
** Summary changed:
- Screen brightness cannot be adjusted
+ Screen brightness cannot be adjusted on ASUS Eeepc 1015PEM
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Title:
Screen brightnes
Also be sure to try the steps at:
https://wiki.ubuntu.com/Kernel/Debugging/Backlight .
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Title:
Screen brightness cannot be adjusted
To manage no
Would it be possible for you to test the latest upstream kernel? Refer
to https://wiki.ubuntu.com/KernelMainlineBuilds . Please test the latest
v3.15 kernel[0].
If this bug is fixed in the mainline kernel, please add the following
tag 'kernel-fixed-upstream'.
If the mainline kernel does not fix t
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