Summary: | DisplayPort config working for Win7/64 but not Linux on same H/W | ||
---|---|---|---|
Product: | DRI | Reporter: | Clive <sad_bunny> |
Component: | DRM/Intel | Assignee: | Intel GFX Bugs mailing list <intel-gfx-bugs> |
Status: | CLOSED FIXED | QA Contact: | Intel GFX Bugs mailing list <intel-gfx-bugs> |
Severity: | normal | ||
Priority: | medium | CC: | intel-gfx-bugs |
Version: | XOrg git | ||
Hardware: | x86-64 (AMD64) | ||
OS: | Linux (All) | ||
Whiteboard: | |||
i915 platform: | SKL | i915 features: | display/DP |
Description
Clive
2016-10-05 09:23:37 UTC
(In reply to Clive from comment #0) > System: Host: SkyLake Kernel: 3.19.0-32-generic x86_64 (64 bit gcc: 4.8.2) Sorry, that kernel version is *way* too old for Skylake, and you'll likely also need a much newer userspace for DP MST as well. Jani, Firstly, thank you *so much* for such a rapid response. I am sorry for wasting your time with what may be a non-bug... As this is my "main" system, I will take the opportunity to refresh both Windows (to 10) and Mint (to 18.0, Sarah) to see if this addresses the concern. I will gladly report back as soon as I am able to report results. If it is not too much of an imposition, may I ask you if Mint 18.0 Kernel (4.4) will be appropriate to attempt DisplayPort daisy-chaining? Thanks in advance - and sorry for the silly questions... Thanks Clive (In reply to Clive from comment #2) > If it is not too much of an imposition, may I ask you if Mint 18.0 Kernel > (4.4) will be appropriate to attempt DisplayPort daisy-chaining? It might just work... however there are *plenty* of other important fixes for Skylake all the way to the latest 4.8 kernel released a couple of days ago. 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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