On Thu, May 7, 2015, at 14:19, Henrique de Moraes Holschuh wrote:
On Tue, Apr 21, 2015, at 16:04, Andrew Wienecke wrote:This was working previously, was working during the netboot install, is no longer working. Fixes online didn't. I'm going to try a few more things, but this is about all the useful stuff I'm aware that I should provide, let me know if you need more.[ 3.470352] thinkpad_acpi: ThinkPad ACPI Extras v0.25[ 3.470360] thinkpad_acpi: http://ibm-acpi.sf.net/[ 3.470363] thinkpad_acpi: ThinkPad BIOS GSET60WW (2.05 ), EC unknown[ 3.470366] thinkpad_acpi: Lenovo ThinkPad X140e, model 20BLS00400[ 3.476142] thinkpad_acpi: Unsupported brightness interface, please contact ibm-acpi-devel@xxxxxxxxxxxxxxxxxxxxx[ 3.483092] thinkpad_acpi: radio switch found; radios are enabled[ 3.483124] thinkpad_acpi: possible tablet mode switch found; ThinkPad in laptop mode[ 3.483148] thinkpad_acpi: This ThinkPad has standard ACPI backlight brightness control, supported by the ACPI video driver[ 3.483151] thinkpad_acpi: Disabling thinkpad-acpi brightness events by default...Well, brightness control for the X140e goes through the GPU drivers, and not thinkpad-acpi. Check the ATI Radeon driver stack, etc.IOW, the issue is unlikely (but not impossible) to be related to thinkpad-acpi.
I replied too soon. This is either an Ubuntu or Debian with a 3.16 kernel, correct? Apparently there is some sort of change (and a regression) in the 3.16-ckt longterm kernel series which both distros use for their kernels.
It is still very weird that it caused an user-visible change in brightness handling, but I need to know what changed in that kernel to understand what is happening.
--
"One disk to rule them all, One disk to find them. One disk to bring
them all and in the darkness grind them. In the Land of Redmond
where the shadows lie." -- The Silicon Valley Tarot
Henrique Holschuh
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