[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 #16 from Ville Syrjala <ville.syrjala at linux.intel.com> ---
Assuming the watermarks get computed correctly, the only issue i can think of
is that the WM latency values provided by the BIOS might be too optimistic. My
SNB machine has the same SSKPD though (not that I've ever tried dual 25x14
displays on it).

Does the problem occur with just one of the displays plugged in?

Or with two displays and lower resolution on both. 1920x1080 at 60 should be OK.

Can you take some register dumps (for the original dual 2560x1440 case)? I'd
like to check it things look OK. As root run this:

intel_reg_read 0xc6014 0xc6040 0xc6044 0xc6018 0xc6048 0xc604c 0x45100 0x45104 
0x45108 0x4510c 0x45110 0x45120 0x145d10 0x42000 0x42004 0x42020 0x70180
0x71180

intel_reg_read is part of intel-gpu-tools.

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