After updating to Kubuntu 13.10 it got worse again, also the workaround
using "acpi_backlight=vendor" does not fully work: It allows controlling
the brightness via KDE's power-applet, but the function-keys (Fn+cursor
left or right) do not work at all (also "xev" does not report and
KeyPress event when pressing the function keys.
Here are some test-results using latest 13.10-Kernel
(3.11.0-15-generic), latest mainline-kernel (), with and without
"acpi_backlight=vendor", using different BIOS-Versions ("BIOS V1.16
11/28/2012" and "BIOS V2.13 04/24/2012"), basically the behaviour is the
same for both Kernel- and BIOS-Versions, it only changes with the
kernel-param.
1: 3.11.0-15-generic, BIOS V1.16, no kernel-options
Fn-Keys recognized (by KDE and also by xev), but brightness does not change,
brightness can't be changed also via applet
2: 3.12.7-031207-generic, BIOS V1.16, no kernel-options
same as with 1
3: 3.11.0-15-generic, BIOS V1.16, "acpi_backlight=vendor"
Fn-Keys not recognized, but brightness can be changed via power-applet
4: 3.12.7-031207-generic, BIOS V1.16, "acpi_backlight=vendor"
same as 3
5. 3.11.0-15-generic, BIOS V2.13, no kernel-options
Fn-Keys recognized by xev (XF86MonBrightnessUp and XF86MonBrightnessDown), but
brightness does not change, brightness can't be changed also via applet
6. 3.12.7-031207-generic, BIOS V2.13, no kernel-options
same as with 5 (and 1)
7. 3.11.0-15-generic, BIOS V2.13, "acpi_backlight=vendor"
Fn-Keys not recognized, but brightness can be changed via power-applet
8. 3.12.7-031207-generic, BIOS V2.13, "acpi_backlight=vendor"
same as 7 (and 3)
Attached you can find the output of dmesg for each test, as well as the
dsdt with both BIOS-versions.
Is there any chance to get both working again? (i.e. recognition of Fn-
keys, as well as the ability to change the brightness)
** Attachment added: "tests.zip"
https://bugs.launchpad.net/ubuntu/+source/linux/+bug/907555/+attachment/3950932/+files/tests.zip
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https://bugs.launchpad.net/bugs/907555
Title:
Brightness-Troubles with Acer Travelmate 8481TG
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