[Bug 276482] New: brightness setting via Fn+brightness key limited to half of possible levels

[Arkadiusz Miskiewicz]

https://bugs.kde.org/show_bug.cgi?id=276482

           Summary: brightness setting via Fn+brightness key limited to
                    half of possible levels
           Product: kde
           Version: unspecified
          Platform: Unlisted Binaries
        OS/Version: Linux
            Status: UNCONFIRMED
          Severity: normal
          Priority: NOR
         Component: general
        AssignedTo: unassigned-bugs at kde.org
        ReportedBy: arekm at maven.pl


Version:           unspecified (using KDE 4.6.4) 
OS:                Linux

When pressing Fn+brightness keys the brightness does change but it skips some
levels

Reproducible: Always

Steps to Reproduce:
[arekm at t400 ~]$ cat /sys/class/backlight/acpi_video0/brightness
15
press Fn+backlight down
[arekm at t400 ~]$ cat /sys/class/backlight/acpi_video0/brightness
13
press Fn+backlight down
[arekm at t400 ~]$ cat /sys/class/backlight/acpi_video0/brightness
11
press Fn+backlight down
[arekm at t400 ~]$ cat /sys/class/backlight/acpi_video0/brightness
8
press Fn+backlight down
[arekm at t400 ~]$ cat /sys/class/backlight/acpi_video0/brightness
6

and so on.

Actual Results:  
See above.

Expected Results:  
I expect it to change by "1" level, not by "2" or "3" steps.

[root at t400 ~]# echo 14 > /sys/class/backlight/acpi_video0/brightness
[root at t400 ~]# echo 13 > /sys/class/backlight/acpi_video0/brightness
[root at t400 ~]# echo 12 > /sys/class/backlight/acpi_video0/brightness
[root at t400 ~]#

and so one allows me to change by "1" level, so kde should also be able to
control that.

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