[Bug 94041] New: 4.4.1 breaks external monitor support in console

bugzilla-daemon at freedesktop.org bugzilla-daemon at freedesktop.org
Mon Feb 8 07:24:14 UTC 2016


https://bugs.freedesktop.org/show_bug.cgi?id=94041

            Bug ID: 94041
           Summary: 4.4.1 breaks external monitor support in console
           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: bror.bellander at gmail.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Previously reported here: https://bugzilla.kernel.org/show_bug.cgi?id=111931
which according to reply was incorrect place and redirected to post here
instead.

Copy of bug report:

Computer: Dell Latitude E6430 (singel graphics card model)
Dist: ArchLinux
Setup: Two external monitors attached via VGA and HDMI.

Problem:
tl;dr-version
Previous to 4.4.1-1 I could get my console to show on my external monitors. Now
I can't.

Long-version:
Lets begin by starting the computer and go from there. Note that I boot into a
TTY and use 'startx' from there to get my graphical environment up as I
sometimes don't use X to conserve battery.

Pre-upgrade; When I booted the computer I would get my login in my laptops
screen and my external monitor attaced to the VGA port. I would login and
(usually) type 'startx'. This, ofc, read my .xinitrc. To this I had added the
line "xrandr --output VIRTUAL1 --off --output DP3 --off --output DP2 --off
--output DP1 --off --output HDMI3 --off --output HDMI2 --off --output HDMI1
--mode 1920x1080 --pos 1080x480 --rotate normal --output LVDS1 --off --output
VGA1 --mode 1920x1080 --pos 0x0 --rotate left" which sets the output to my
external monitors. My computer only supports 2 monitors to be active at the
same time, so the laptops screen is not used.
Anyhow. After the graphical environment had started I could go to a TTY with
Alt+F# or just kill X. The TTY would now display on my external monitors and
the laptop would still be blank. Just like I want it to.

Post-upgrade: When I boot the computer I get my login on the laptop-screen
ONLY. No output to VGA or HDMI. I login with the same steps as before. xrandr
fails to setup the screens correctly on startx.  The external monitors are
activated and the laptop screen goes blank, but the external monitors show the
same image. No rotation or extending is done. I can re-issue the xrandr line
seen above and the settings take affect.
When I now either kill X or switch to a TTY, I get nothing. Laptop monitor is
blank. VGA is blank. And HDMI is blank. Meaning: Once I've started X and set up
my monitors I can't use a TTY unless I tell xrandr to set my laptop-monitor as
active.

I installed 4.1.17-1 (linux-lts) to double check if it really was the kernel.
Sure enough, it works as before there.

Is there any other information that I can provide to help in this issue?
This is my first bug-report regarding the kernel, and I'm unsure if I filed
this in the correct category. Sorry if I did.

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