Bug#833959: xserver-xorg-video-intel: Rendering Performance Impacted

[Michel Dänzer <michel@daenzer.net>]

On 11/08/16 06:34 AM, Leo L. Schwab wrote:
> Package: xserver-xorg-video-intel
> Version: 2:2.99.917+git20160706-1
> Severity: important
> 
> Dear Maintainer,
> 
> 	Since updating to the latest Intel driver, I've noted rendering
> performance has suffered in some applications.

As you can see in the Xorg log file, you're no longer using the intel
driver.


> I've finally identified a program that reliably exhibits the issue --
> 'phosphor' from the xscreensaver package.
> 
> 	To reproduce:
> 	- Run phosphor by hand:
> 	  /usr/lib/xscreensaver/phosphor
> 	- Wait for the cursor to arrive at the bottom of the window.  When
> 	  the "terminal" scrolls, rendering performance tanks immediately.
> 	  This is doubtless due to the full-window fade effect being
> 	  applied, which has now become very slow.  This slowness was not
> 	  present in previous driver versions.

FWIW, https://patchwork.freedesktop.org/patch/105129/ should help with
this particular issue.


-- 
Earthling Michel Dänzer               |               http://www.amd.com
Libre software enthusiast             |             Mesa and X developer