4.6 DRM/i915 update CFT (Sandy Bridge?)/IvyBridge/Haswell/Broadwell/SkyLake/KabyLake supported

[Matthew Macy]

 ---- On Mon, 23 May 2016 01:44:17 -0700 Juan Ramón Molina Menor <listjm at club.fr> wrote ---- 
 > Hi! 
 >  
 > Your commits overnight have restored and even improved the performance  
 > with my Haswell (HD 4400) GPU: Lower CPU usage and snappier resize /  
 > full-screen changes. 
 >  
 > But on the other hand, loading the i915kms module through startx  
 > (non-root) panics, I have to use kldload i915kms. 
 >  
 > Also, changing the power mode (plugging or unplugging the power cord)  
 > leads to instant panic, while with the drm-next-3.9 branch, switching  
 > AC/battery modifies backlight value up and down without issues. I have  
 > replaced the screenshot: 
 >  
 > https://wiki.freebsd.org/Laptops/ThinkPad_S440?action=AttachFile&do=get&target=panic-DRM-46.jpg 

I'll need the backtrace from both panics. Neither of them occurs on my hardware. If you have a problem recovering a core dump try loading drm2 first and then setting dev.drm.skip_ddb=1. That will bypass much of the work that panic tries to do to quiesce the CPU before dumping core.

-M