OK, then ACPI OSI doesn't matter for the behavior. Hmm... We can at least narrow down the regression kernel. 3.13, 3.14 and 3.15 kernel packages are available at: http://download.opensuse.org/repositories/home:/tiwai:/kernel:/3.13/ http://download.opensuse.org/repositories/home:/tiwai:/kernel:/3.14/ http://download.opensuse.org/repositories/home:/tiwai:/kernel:/3.15/ 3.12 kernel is found in Kernel:SLE12. Check which one starts showing the wrong behavior. I guess it's relatively new.