[Intel-gfx] Very bad performance from intel chipset on Thinkpad T540p (2880x1620)

[Chris Wilson]

On Thu, Apr 23, 2015 at 03:22:44PM -0700, Marc MERLIN wrote:
> I do boot my kernel with these options I found recommended to save
> power, maybe I should remove some of them because they kill performance?
> pcie_aspm=force i915.i915_enable_rc6=7 i915.i915_enable_fbc=1 i915.semaphores=1 i915.lvds_downclock=1 acpi_backlight=vendor

Those options are broken.

> Relevant bits form Xorg.log:
> [    49.114] (II) Loading /usr/lib/xorg/modules/drivers/intel_drv.so
> [    49.122] (II) Module intel: vendor="X.Org Foundation"
> [    49.122] 	compiled for 1.15.99.904, module version = 2.21.15

Start by grabbing an updated xf86-video-intel.
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre