[Bug 93774] New: Can't set interlaced resolution on TV connected to DP

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=93774

            Bug ID: 93774
           Summary: Can't set interlaced resolution on TV connected to DP
           Product: DRI
           Version: DRI git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: major
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: macieksitarz at wp.pl
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 121134
  --> https://bugs.freedesktop.org/attachment.cgi?id=121134&action=edit
xrandr --verbose

Description:
I can't set the proper resolution on my TV connected via DisplayPort. The TV
needs 1920x1080i. After setting "1920x1080i" mode I get "No signal" on the TV,
with "1920x1080" the X shows on TV (I don't want to use it as I get random red
lines on the screen).

The problem appears since some time now, probably after some kernel updated.
When I use kernel 4.1.15 (linux-lts) it works fine.

Steps to reproduce the issue:
1. Connect the TV via DP (DP to DVI to HDMI adapter to be exact)
2. Set the mode with xrandr:
xrandr --output LVDS1 --primary --auto  --output HDMI1  --above LVDS1 --mode
1920x1080i
3. The TV screen shows "No signal"

How often does the steps listed above trigger the issue?
always

The following information about your system:


System environment:
-- chipset: i915
-- system architecture: Linux mcxT 4.4.0-1-drm-intel-nightly #1 SMP PREEMPT Sun
Jan 17 16:53:12 CET 2016 x86_64 GNU/Linux
-- xf86-video-intel: 1:2.99.917+519+g8229390-1
-- xserver: xorg-server 1.18.0-4
-- mesa: 11.1.1-1
-- libdrm: 2.4.66-1
-- kernel version: 4.4.0-1-drm-intel-nightly
-- Linux distribution: Arch Linux
-- Machine or mother board model: Lenovo T410
-- Display connector: DP (DP to DVI adapter, then DVI to HDMI adapter, then
HDMI cable plugged to TV)

Additional info:

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