[Bug 70254] [snb dp hotplug] Pipe B, PCH transcoder B FIFO underrun

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=70254

--- Comment #37 from Ville Syrjala <ville.syrjala at linux.intel.com> ---
(In reply to comment #36)
> I'm not noticing a change in the register values when I change the latencies:
> 
> root at rnavarro-thinkpad:~# cat /sys/kernel/debug/dri/0/i915_pri_wm_latency
> WM0 7 (0.7 usec)
> WM1 3 (1.5 usec)
> WM2 4 (2.0 usec)
> WM3 22 (11.0 usec)
> 
> root at rnavarro-thinkpad:~# intel_reg_read 0x45100 0x45104
> 0x45100 : 0xD0006
> 0x45104 : 0xD0006
> 
> root at rnavarro-thinkpad:~# echo '14 6 8 44' >
> /sys/kernel/debug/dri/0/i915_pri_wm_latency
> 
> root at rnavarro-thinkpad:~# cat /sys/kernel/debug/dri/0/i915_pri_wm_latency
> WM0 14 (1.4 usec)
> WM1 6 (3.0 usec)
> WM2 8 (4.0 usec)
> WM3 44 (22.0 usec)
> 
> root at rnavarro-thinkpad:~# intel_reg_read 0x45100 0x45104
> 0x45100 : 0xD0006
> 0x45104 : 0xD0006
> 
> Is that unexpected?

Did you do the "xset dpms force off; xset dpms force on" commands in between?

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