I'm running NetBSD 9.3-amd64 GENERIC on a Dell Precision M4600 (Sandy Bridge) mobile workstation, used as a server.
Closing the lid will not turn off the backlight, which conducts and builds up heat inside the case. # wsconsctl -d -w backlight=0 wsconsctl: WSDISPLAYIO_PARAM_BACKLIGHT: Inappropriate ioctl for device # sysctl -a | grep acpi.acpi hw.acpi.acpiout1.brightness = 50 hw.acpi.acpivga0.bios_switch = 1 This works fine but only dims the display: # sysctl -w hw.acpi.acpiout1.brightness=0 No other relevant variable seems available in sysctl. I'm using an i915 chipset: # pcictl pci0 list 000:00:0: Intel Sandy Bridge (mobile) Host Bridge (host bridge, revision 0x09) 000:02:0: Intel Sandy Bridge (mobile) GT2+ Integrated Graphics Device (VGA display, revision 0x09) (...) # dmesg | grep display [ 6.187988] wsdisplay0 at intelfb0 kbdmux 1: console (default, vt100 emulation), using wskbd0 [ 6.208326] wsmux1: connecting to wsdisplay0 [ 18.353375] wsdisplay0: screen 1 added (default, vt100 emulation) [ 18.363376] wsdisplay0: screen 2 added (default, vt100 emulation) # dmesg | grep acpivga [ 1.019042] acpivga0 at acpi0 (VID): ACPI Display Adapter [ 1.019042] acpiout0 at acpivga0 (CRT, 0x0100): ACPI Display Output Device [ 1.019042] acpiout1 at acpivga0 (LCD, 0x0400): ACPI Display Output Device [ 1.019042] acpiout2 at acpivga0 (DVI, 0x0302): ACPI Display Output Device [ 1.019042] acpiout3 at acpivga0 (DVI2, 0x0303): ACPI Display Output Device [ 1.019042] acpiout4 at acpivga0 (DVI3, 0x0304): ACPI Display Output Device [ 1.019042] acpiout5 at acpivga0 (DP, 0x0300): ACPI Display Output Device [ 1.019042] acpiout6 at acpivga0 (DP2, 0x0301): ACPI Display Output Device [ 1.019042] acpiout7 at acpivga0 (DP3, 0x0305): ACPI Display Output Device [ 1.019042] acpivga0: connected output devices: [ 1.019042] acpivga0: 0x0100 (acpiout0): Ext. Monitor, head 0 [ 1.019042] acpivga0: 0x0400 (acpiout1): Unknown Output Device, head 0 [ 1.019042] acpivga0: 0x0302 (acpiout2): Unknown Output Device, head 0 [ 1.019042] acpivga0: 0x0303 (acpiout3): Unknown Output Device, head 0 [ 1.019042] acpivga0: 0x0300 (acpiout5): Unknown Output Device, head 0 [ 1.019042] acpivga0: 0x0301 (acpiout6): Unknown Output Device, head 0 [ 1.019042] acpivga0: 0x0304 (acpiout4): Unknown Output Device, head 0 [ 1.019042] acpivga0: 0x0305 (acpiout7): Unknown Output Device, head 0 # modstat | grep wmi acpiwmi driver builtin - 3 - - wmidell driver builtin - 0 - acpiwmi,sysmon_power wmieeepc driver builtin - 0 - acpiwmi,sysmon_power wmihp driver builtin - -1 - acpiwmi,sysmon_envsys wmimsi driver builtin - 0 - acpiwmi The display turns off fine with Linux 5.10 (Alpine 3.17). I'm not yet sure how to fix this. Any clue is appreciated. D.B.
