Bug 91108 - [xf86-video-intel] poor performance and stuttering
Summary: [xf86-video-intel] poor performance and stuttering
Status: RESOLVED INVALID
Alias: None
Product: xorg
Classification: Unclassified
Component: Driver/intel (show other bugs)
Version: unspecified
Hardware: x86-64 (AMD64) Linux (All)
: medium normal
Assignee: Chris Wilson
QA Contact: Intel GFX Bugs mailing list
URL:
Whiteboard:
Keywords:
Depends on:
Blocks:
 
Reported: 2015-06-25 10:25 UTC by mohlerm
Modified: 2015-07-29 20:37 UTC (History)
0 users

See Also:
i915 platform:
i915 features:

Attachments
Xorg.0.log (23.21 KB, text/plain)
2015-06-25 10:25 UTC, mohlerm 		no flags Details
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Description mohlerm 2015-06-25 10:25:37 UTC 
Created attachment 116714 [details]
Xorg.0.log

This issue came up after upgrading to the latest version of the intel driver.

My terminal emulator has very poor performance and some programs don't show text.
General system performance is way worse than before.

Using version: 1:2.99.917+364+gb24e758-1, Thinkpad X1 Carbon, Intel Core i7 3667U with an Intel HD Graphics 4000 
Downgrading to 2.99.917-5 fixed the issue.


Might be related to: https://bugs.freedesktop.org/show_bug.cgi?id=91105
Comment 1 Chris Wilson 2015-06-25 10:31:54 UTC 
To start with:

[     9.086] Kernel command line: BOOT_IMAGE=/vmlinuz-linux root=UUID=49a81897-cb3e-471e-9bd8-47caa6367437 rw quiet splash i915.enable_rc6=7 i915.enable_fbc=1 i915.lvds_downclock=1 drm.vblankoffdelay=1 i915.semaphores=1 acpi_osi=Linux acpi_backlight=vendor

is dangerous.

Do not set:
   i915.enable_rc6
   i915.enable_fbc
   i915.lvds_downclock
   i915.semaphores
Comment 2 Chris Wilson 2015-07-29 20:37:12 UTC 
Please reopen if you can disable the overrides on the commandline and can help investigate.

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