[Bug 94101] System hangs for seconds repeatedly and sometimes crashes

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=94101

--- Comment #13 from Milos Kaurin <milos.kaurin at gmail.com> ---
(In reply to Imre Deak from comment #12)
> (In reply to Milos Kaurin from comment #8)
> > I also confirm what Jani Nikula said: Setting "i915.i915_enable_rc6=0"
> 
> Should be i915.enable_rc6=0 .


Thank you Imre. I stand corrected.

Just tried it - "4.4.9-300.fc23.x86_64" with "i915.enable_rc6=0". No i915 stack
traces (or any other) with kodi and firefox running for several minutes now.

The only thing I see in dmesg regarding rc6 is this line close to boot:

[  +0.088745] Setting dangerous option enable_rc6 - tainting kernel


For those having the issue, and if you want to use the latest kernel:

1. As root, edit /etc/default/grub
2. Find the line that starts with GRUB_CMDLINE_LINUX
   * Append i915.enable_rc6=0
   * Example: GRUB_CMDLINE_LINUX="rhgb quiet i915.enable_rc6=0"
3a. If you have a BIOS system, follow this guide[1]
3b. If you have a UEFI syste, follow this guide[2]
4. Reboot
5. Check  "uname -a" and dmesg to check whether you have set this option
correctly
7. Test

NOTE: The rc6 option for the i915 appears to control power saving settings[3],
so expect higher power consumption.

I hope this helps.


[1] Updating GRUB 2 on BIOS systems:
https://fedoraproject.org/wiki/GRUB_2?rd=Grub2#Updating_GRUB_2_configuration_on_BIOS_systems
[2] Updating GRUB 2 on UEFI systems:
https://fedoraproject.org/wiki/GRUB_2?rd=Grub2#Updating_GRUB_2_configuration_on_UEFI_systems
[3] http://blog.vivi.eng.br/?p=162

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