Igor: AFAIK, laptop-mode is not enabled by default. You need to tweak /etc/laptop-mode/laptop-mode.conf and switch the ENABLE_LAPTOP_MODE_ON_BATTERY option so that CONTROL_HD_POWERMGMT=1 really takes effect. So the bug does not come from here.
Igor: AFAIK, laptop-mode is not enabled by default. You need to tweak /etc/laptop- mode/laptop- mode.conf and switch the ENABLE_ LAPTOP_ MODE_ON_ BATTERY option so that CONTROL_ HD_POWERMGMT= 1 really takes effect. So the bug does not come from here.