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

[Marc MERLIN]

Hi Chris, thanks for the answer,

On Thu, Apr 23, 2015 at 11:49:24PM +0100, Chris Wilson wrote:
> 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.
 
Ok, which ones specifically? :)
Without some of those, battery use from the driver has been bad in the past,
but I don't know which one does what exactly :)

- pcie_aspm=force
- i915.i915_enable_rc6=7
- i915.i915_enable_fbc=1
- i915.semaphores=1
- i915.lvds_downclock=1

> > 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.

On debian testing and unstable, it's the latest:
legolas:~# apt-get install xserver-xorg-video-intel/unstable
Reading package lists... Done
Building dependency tree       
Reading state information... Done
xserver-xorg-video-intel is already the newest version.
Selected version '2:2.21.15-2+b2' (Debian:testing [amd64]) for 'xserver-xorg-video-intel'

But now that you mention it, I just found this, so I'll try this out:
legolas:~# apt-get install xserver-xorg-video-intel/experimental
Reading package lists... Done
Building dependency tree       
Reading state information... Done
Selected version '2:2.99.917-1~exp1' (Debian:experimental [amd64]) for 'xserver-xorg-video-intel'

On top of being bleeding edge enoug not to be in debian unstable, does it have 
performance enhancements that you are hopeful will help my situation?

Thanks,
Marc
-- 
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Microsoft is to operating systems ....
                                      .... what McDonalds is to gourmet cooking
Home page: http://marc.merlins.org/