[Bug 98091] New: 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

            Bug ID: 98091
           Summary: DisplayPort config working for Win7/64 but not Linux
                    on same H/W
           Product: DRI
           Version: XOrg git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: sad_bunny at hotmail.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

First-time poster, inexperienced with bug reporting. Apologies in advance, etc. 

Running a dual-booting system based on an Intel 6700T Skylake on top of an Asus
Z170i Pro Motherboard (16Gb RAM, 1Tb Samsung SSD). 

3 Monitors, all Dell U2415W (24", 1920x1200, 60Hz). 

Configure monitors using DisplayPort cables, daisy-chained with single output
from PC to each monitor in turn (following Dell DP setup guide) and with
Windows 7/64, this configuration works flawlessly, with excellent screen
response and flicker-free stability.

Reboot machine into Mint Linux 17.3 (Rosa) 64-Bit and all 3 screens will remain
dark. 

Current Mint setup detailed below... Entirely happy to provide more
information, experiment, etc, if required. 

inxi -c5 -Fxxz
System: Host: SkyLake Kernel: 3.19.0-32-generic x86_64 (64 bit gcc: 4.8.2)
Desktop: Cinnamon 2.8.8 (Gtk 3.10.8~8+qiana) dm: mdm
Distro: Linux Mint 17.3 Rosa
Machine: Mobo: ASUSTeK model: Z170I PRO GAMING v: Rev X.0x
Bios: American Megatrends v: 0701 date: 11/16/2015
CPU: Quad core Intel Core i7-6700T (-HT-MCP-) cache: 8192 KB
flags: (lm nx sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx) bmips: 22464
clock speeds: min/max: 800/2801 MHz 1: 800 MHz 2: 800 MHz
3: 800 MHz 4: 800 MHz 5: 1900 MHz 6: 1100 MHz 7: 900 MHz
8: 1200 MHz
Graphics: Card: Intel Sky Lake Integrated Graphics
bus-ID: 00:02.0 chip-ID: 8086:1912
Display Server: X.Org 1.17.1 drivers: intel (unloaded: fbdev,vesa)
Resolution: 1920x1200 at 60.0hz, 1920x1200 at 60.0hz
GLX Renderer: Mesa DRI Intel Skylake DT GT2
GLX Version: 3.0 Mesa 10.5.9 Direct Rendering: Yes
Audio: Card Intel Sunrise Point-H HD Audio
driver: snd_hda_intel bus-ID: 00:1f.3 chip-ID: 8086:a170
Sound: Advanced Linux Sound Architecture v: k3.19.0-32-generic
Network: Card-1: Intel Ethernet Connection (2) I219-V
driver: e1000e v: 2.3.2-k bus-ID: 00:1f.6 chip-ID: 8086:15b8
IF: eth0 state: up speed: 1000 Mbps duplex: full mac: <filter>
Card-2: Qualcomm Atheros QCA6174 802.11ac Wireless Network Adapter
bus-ID: 04:00.0 chip-ID: 168c:003e
IF: N/A state: N/A mac: N/A
Drives: HDD Total Size: 1000.2GB (3.5% used)
ID-1: /dev/sda model: Samsung_SSD_850 size: 1000.2GB serial: {###############}
Partition: ID-1: / size: 16G used: 719M (5%) fs: ext4 dev: /dev/sda5
ID-2: /tmp size: 7.4G used: 18M (1%) fs: ext4 dev: /dev/sda10
ID-3: /usr size: 16G used: 5.8G (41%) fs: ext4 dev: /dev/sda7
ID-4: /var size: 16G used: 1.1G (8%) fs: ext4 dev: /dev/sda9
ID-5: /home size: 16G used: 4.9G (35%) fs: ext4 dev: /dev/sda8
ID-6: swap-1 size: 16.53GB used: 0.00GB (0%) fs: swap dev: /dev/sda6
RAID: System: supported: N/A
No RAID devices: /proc/mdstat, md_mod kernel module present
Unused Devices: none
Sensors: System Temperatures: cpu: 29.8C mobo: 27.8C
Fan Speeds (in rpm): cpu: N/A
Info: Processes: 236 Uptime: 2:14 Memory: 918.2/15932.9MB
Init: Upstart v: 1.12.1 runlevel: 2 default: 2 Gcc sys: 4.8.4
Client: Shell (bash 4.3.111 running in gnome-terminal) inxi: 2.2.28

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