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[Bug 297155] New: Brightness control /proc/acpi/ibm/brightness: not using full range
  • From: bugzilla_noreply@xxxxxxxxxx
  • Date: Fri, 3 Aug 2007 03:49:33 -0600 (MDT)
  • Message-id: <bug-297155-21960@xxxxxxxxxxxxxxxxxxxxxxxxx/>
https://bugzilla.novell.com/show_bug.cgi?id=297155

           Summary: Brightness control /proc/acpi/ibm/brightness: not using
                    full range
           Product: openSUSE 10.3
           Version: Alpha 6
          Platform: Other
        OS/Version: Other
            Status: NEW
          Severity: Minor
          Priority: P5 - None
         Component: Kernel
        AssignedTo: kernel-maintainers@xxxxxxxxxxxxxxxxxxxxxx
        ReportedBy: burnus@xxxxxx
         QAContact: qa@xxxxxxx
          Found By: ---


This is with a few-days old Factory.

I have a Thinpad R61 (should be the same hardware as a T61).
If I change the brightness using kpowersave or directly via
  /proc/acpi/ibm/brightness
I can only reach half of the total range.
Starting from level 0 and minimal brightness using [Fn]+[bright v]:
  echo level 7 > /proc/acpi/ibm/brightness
gives only half of the maximal brightness.

Analogously, starting from level 7 plus [Fn]+[bright ^], going to level 0
reduces also the brightness to half and not to the minimal possible value.

Also, if one presses [Fn]+[bright ^/v], the level jumps from 7 to 1/0
[alternating] to 1 to 0 and from 0 to 6/7 to 7. (Actually, some values in
between are shown, if one outputs /proc/acpi/ibm/brightness every 0.1s: "0 ...
0 1 2 3 4 5 6 7 6 7 6 7 ...).

I don't know which hwinfo --<???> or similar info is needed.


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