[Kernel-packages] [Bug 1377436] [NEW] Brightness to minimum and controls disabled when undocking X220

Public bug reported: To reproduce, remove the X220 from the dock. The brightness is set to minimum (the screen is nearly unreadable) and the brightness control is broken, you can't adjust it by hardware keys. The symptom is fixed by docking and undocking again. This is the same problem as

[Kernel-packages] [Bug 1308674] Re: [Lenovo ThinkPad X220] kernel 3.13 i915 brightness settings broken when going from docked - undocked

I can add that docking and undocking again re-enables brightness adjustment. -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1308674 Title: [Lenovo ThinkPad X220] kernel 3.13 i915

[Kernel-packages] [Bug 1308674] Re: [Lenovo ThinkPad X220] kernel 3.13 i915 brightness settings broken when going from docked - undocked

I just tried this with kernel 3.13.0-34.60 and I'm still experiencing the problem. Brightness set to minimum and not adjustable after undocking. I originally encountered another (duplicate?) bug post which suggested to upgrade the x220's BIOS, so I'm also running the latest BIOS version (8DET69WW

[Kernel-packages] [Bug 1348550] Re: When undocking the laptop panel brightness goes to minimum and cannot be increased

*** This bug is a duplicate of bug 1308674 *** https://bugs.launchpad.net/bugs/1308674 This looks like a duplicate of https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1308674 ? FWIW: I have upgraded my BIOS to the latest version (8DET69WW / 1.39) and I'm still seeing the same problem.