[Bug 90951] [snb] Display connected to displayport doesn't wake up when it's turn off and on or enters power saving mode

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=90951

Tom Yan <tom.ty89 at gmail.com> changed:

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                 CC|                            |tom.ty89 at gmail.com

--- Comment #17 from Tom Yan <tom.ty89 at gmail.com> ---
I used to have a similar problem when I use a Radeon with my DP monitor. I
recall if I remove a whole part of code, everything will works perfectly, while
the dev claimed that it's required by most because hot plug detection of DP is
kind of tricky, and my case is a special case.

Later when I read the manual of my monitor, it seems to me that for some board
it needs to be switched to a special mode so that it would handle dpms
correctly. I cannot test if it's the solution because I no longer have the
radeon board and my monitor works perfectly with the DP onboard (haswell gfx)
and nvidia without going into that mode. Nevertheless you might want to see if
yours got such a mode.

References:
1. The code I removed to make things work:
https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/tree/drivers/gpu/drm/radeon/radeon_connectors.c?id=bfa76d49576599a4b9f9b7a71f23d73d6dcff735#n69

2. Manual of my monitor, see Chapter 5.1 Case 3:
http://www.eizoglobal.com/support/db/files/manuals/03V24733D1/UM-03V24733D1-EN.pdf

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