Comment 44 for bug 935778

Created an attachment (id=445026)
dmesg

User-Agent: Opera/9.80 (X11; Linux x86_64; U; de) Presto/2.9.168 Version/11.50

After a fresh restart the adjustment of the lcd brightness works correctly. After putting the system to suspend this won't work. Also after a second time putting to suspend it won't work.

Reproducible: Always

Steps to Reproduce:
1. Restart if you've done a suspend recently.
2. Try Adjusting brightness (on my Notebook using Fn+F6/F7), this should work.
3. Put the system to suspend mode.
4. Wake up the system from suspend and try the steps named in 2 again
Actual Results:
In both cases (before and after suspend) the KDE brightness widget is shown correctly but brightness won't change after suspend.

Expected Results:
Adjusting brightness should work like after a fresh restart.

System:
Toshiba Tecra R850-11M
openSuse 11.4 / 2.6.37.6-0.7-desktop / KDE 4.7

The actual state is also after a suspend shown correctly in the following file:

cat /proc/acpi/toshiba/lcd
brightness: 5
brightness_levels: 8

When adjusting the brightness using the keys the value in the file above is actualized corrctly.

In /var/log/messages and dmesg (also as attachment) the following line appears:
Aug 9 20:38:02 linux-h81p kernel: [ 899.913018] ACPI: Failed to switch the brightness