Ubuntu
linux package

  1. Bug #1098216
  2. Comment #36

Comment 36 for bug 1098216

Revision history for this message
Seth Forshee (sforshee) wrote : Re: Regression in brightness control on Lenovo Thinkpad X230 and X1 Carbon

Nathaniel: You need to boot to a kernel where your backlight doesn't work, i.e. no special kernel patches and no passing acpi_osi="!Windows 2012". Then try to adjust the backlight several times. After that run "dmesg > dmesg.txt" in a terminal and attach dmesg.txt.