[Bug 49402] [snb dp dongle] DP-to-dual-HDMI (link_train issue?)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=49402

--- Comment #24 from Jani Nikula <jani.nikula at intel.com> ---
(In reply to comment #22)
> Kudos for making it work with your hardware - I tried your patch with Linux
> 3.8.0-19-generic / Ubuntu 13.04, but unfortunately it doesn't work for me. I
> can verify that your patch produces the same M/N values as your BIOS, but
> unfortunately my screens (2x Dell U2312) stay blank. 
> 
> Did you change anything else by any chance?

You could try the drm-intel-nightly branch from [1]. It contains Ville's patch,
and many many other changes.

> How did you figure out what values your BIOS uses?

Does the adapter work for you through BIOS? I.e. do you see stuff on screen
before the kernel loads? If yes, you could prevent the i915 driver from loading
(to make sure it doesn't mess with the registers), boot to console, and run
intel_reg_dumper from the intel-gpu-tools [2] package.


[1] git://people.freedesktop.org/~danvet/drm-intel
[2] git://git.freedesktop.org/git/xorg/app/intel-gpu-tools

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