[Bug 88012] [bisected BYT] complete freeze after: drm/i915/vlv: WA for Turbo and RC6 to work together
bugzilla-daemon at freedesktop.org
bugzilla-daemon at freedesktop.org
Fri Oct 30 12:09:39 PDT 2015
https://bugs.freedesktop.org/show_bug.cgi?id=88012
--- Comment #99 from John <jbmacbrodie at yahoo.com> ---
To cap frequency I read the max (779 for mine) from
cat /sys/class/drm/card0/gt_max_freq_mhz
To set pick a lower value (as root)
echo 423 > /sys/kernel/debug/dri/0/i915_max_freq
I tried lower values in 100 Mhz steps until I found stability (to 423 in my
case).
I think you could just put back to the gt_max but this worked for me.
This value resets each boot, and the driver rounds the value to something
close.
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