I have found the reason but it is still a bug. My Dell Inspiron 1525 have Bluetooth which isn't needed most of the time. It is possible to to change the function of the wlan switch in the Bios. Since I need WLAN most of the time and it is easily possible to disable it through the Network Manager I have changed the function to only disable Bluetooth. If I do that WLAN is shown as disabled all the time with the Karmic Kernel, even, if I the switch is set on enabled. If I reset the Bios function to the default configuration WLAN works fine with the default kernel but I can't easily disable Bluetooth. Anyway it is a bug and neither Windows nor the Mainline 2.6.31 Kernel nor the old Kernel of Hardy have a problem with this configuration.
-- Dell Inspiron 1525 WLAN (Intel 3945) doesn't work with Ubuntu Kernel in Karmic [regression] https://bugs.launchpad.net/bugs/421662 You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs