[Bug 98091] DisplayPort config working for Win7/64 but not Linux on same H/W

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=98091

--- Comment #4 from Clive <sad_bunny at hotmail.com> ---
Jani, everyone... 

Please find below an (unsuccessful) status update. 

1. Swapped SSDs on the 6700T in order to be able to perform a clean and
non-destructive installation of Mint 18.0 (Sarah) 64-bit, kernel 4.4. 

2. apt-get update; apt-get upgrade

3. Followed these simple and effective instructions to upgrade Sarah to the 4.8
kernel:-

https://mintguide.org/system/686-install-linux-kernel-4-8-stable-on-linux-mint.html

4. Attempted to implement 3-screen daisy-chaining, observing the following
results... [ using Mint Sarah 18.0/kernel 4.8/Cinnamon desktop ]

4.1. At login, all 3 screens operate successful mirroring mode - output is
clear, flicker-free, with no shadowing, artifacts or vsync issues.

4.2. After login, screen 0 remains active, screens 1 & 2 go dark.

4.3. Using the Cinnamon "Display" applet, observe that parameter for mirroring
is activated and the detected screens shows just a single monitor. 

4.4. Deselect "Mirroring" and the detected screen graphic changes to show all 3
monitors [hardware potentially now recognised].

4.5 Select "Apply"; the Display applet quits, but screens 1 & 2 remain dark.

4.6 After approximately 10 seconds, the display Applet returns to the screen,
once more in mirror mode. 

4.7 Various permutations attempted without success. 

4.8 Quick check of system configuration via "uname -r" and confirmation that
4.8 kernel is running...

5. For a final check, leave the cabling in daisy-chain configuration, swap back
to the Windows 7/64 / Mint 17.3 dual-boot SSD and boot directly in to Windows.
Observe triple-screen, operating flawlessly... 


Observations and conclusions...
There is a visible improvement in the functionality with the 4.8 kernel, with
the display remaining. Trying to "push" a Cinnamon window across from display 0
to displays 1 or 2 results in the application window sliding off-screen, as
though the OS "knows" that there is desktop real estate present, just that it
is not rendering on screen... 

Offer
With the ready availability of a built 4.8 kernel system, I am happy to try
config changes, patches, etc, if that would help. 

Thank you again for the kind advice - you certainly guided me in the right
direction, even if the ultimate destination is still just out of reach...

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