Ubuntu
nvidia-graphics-drivers package

  1. Bug #562005
  2. Comment #6

Comment 6 for bug 562005

Revision history for this message
Tom Gelinas (tomgelinas) wrote : Re: Backlight controls on ThinkPad T510 no longer function when using proprietary drivers

Also, dmesg reports that thinkpad_acpi's backlight controls are not enabled, so it is certainly not controlling the backlight in the VT:

thinkpad_acpi: This ThinkPad has standard ACPI backlight brightness control, supported by the ACPI video driver
thinkpad_acpi: Standard ACPI backlight interface available, not loading native one.