https://bugzilla.kernel.org/show_bug.cgi?id=28942
Summary: no more brightness control on Fujitsu-Siemens SI 2636
laptop with 2.6.38-RC4 kernel
Product: ACPI
Version: 2.5
Kernel Version: 2.6.38-RC4
Platform: All
OS/Version: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: Power-Video
AssignedTo: [email protected]
ReportedBy: [email protected]
Regression: Yes
Created an attachment (id=47512)
--> (https://bugzilla.kernel.org/attachment.cgi?id=47512)
dmidecode Fujitsu-Siemens SI2636
Hello devs,
First thank you for your great work on linux an make all this possible.
After compiling a 2.6.38-RC4 kernel i found that the brightness control
off my laptop Fujitsu-Siemens SI 2636 don't work anymore.
The brightness control work with the fn+F8 an fn+F9 keys with all
previous version off the kernel i tried from 2.6.24 to 2.6.37 .
My system is Kubuntu 10.04 LTS with the kernel mode-settings and the
intel video driver.
In the dmesg output off the 2.6.37 kernel i found 2 related lines :
[Firmware Bug]: ACPI: No _BQC method, cannot determine initial brightness
[drm:intel_panel_get_max_backlight] *ERROR* fixme: max PWM is zero.
But even with those errors the brightness control work fine with the
2.6.37 kernel.
When using the 2.6.38-RC4 kernel i found that the directory
/sys/class/backlight is empty.
Attached is dmidecode.
If you need more info just tell me
Tasev Nikola
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