https://bugs.freedesktop.org/show_bug.cgi?id=87886
--- Comment #27 from Stéphane Travostino <stephane.travost...@gmail.com> --- (In reply to Eero Tamminen from comment #26) > as root, mount debugfs and monitor CAGF (actual GPU frequency) value from > "/sys/kernel/debug/dri/0/i915_frequency_info", or if you have older kernel > from "/sys/kernel/debug/dri/0/i915_cur_delayinfo" Does it keep up, or go > down when you get FPS drop? > > (If it goes down, this seems like kernel power management issue.) Good call! Watching i915_frequency_info while running glxgears on Intel, I see it starts at 1100 MHz and after a few seconds it starts to drop to 650 MHz and up again, repeatedly. Frequency changes collerate with FPS changes in glxgears, so yeah, it seems it is a kernel pm issue. I tried booting up with i915.powersave=0 i915.enable_rc6=0, also tried disabling Runtime PM on the Intel card via powertop but I can't find a way to force the frequency to max values to be 100% sure it's frequency switching related. Any idea where to go from there? -- You are receiving this mail because: You are the assignee for the bug.
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