Intel Graphics Power Management and mouse lag on resume after sleep

[SammichPG]

Title says everything, my mouse lags and scrolling performance is awful for up to 30 seconds after resuming from sleep and I think I've found where's the issue since when I disable the power management for the graphics the issue disappears.

-I'm running ubuntu 12.04 but I've experienced the same issue with debian 7, debian testing and mint 13 which is 12.04 based, different kernel versions though.

-my laptop is a thinkpad x200s (core2duo culv with intel igp) which should be supported perfectly

-I installed TLP and that's when the issue showed up, uninstalled it and didn't have any problem

-I installed the laptop-mode-tools package and the stutter is back.

Using powertop I disabled the power management for the Intel driver and after few suspend-resume cycles the lag didn't show up so I'm sure I've pinpointed the root cause of the issue.

Any idea about what can I do to troubleshoot further and hopefully fix my issues? This laptop has good battery life for a 45nm cpu (9 cell battery heh) but it's never enough :biggrin:

 

[Jodell88]

I've never had much luck with laptop-mode-tools after suspend either. I would look at dmesg message before and after to see if everything was restored as it was before the suspend.

 

[SammichPG]

Fixed (hopefully) by adding power management options in a config file for the intel graphics kernel module, maybe laptop-mode-tools was trying to downclock the gpu while the kernel module wanted to run at full speed thus causing trouble.

The file is /etc/modprobe.d/i915.conf (empty in my ubuntu install) and the arguments are:
options i915 i915_enable_rc6=7 i915_enable_fbc=1 lvds_downclock=1

everything is documented in the always useful arch wiki:
https://wiki.archlinux.org/index.php/Intel_Graphics#Module-based_Powersaving_Options

the year of the linux desktop is not near