[Bug 91900] New: Unable to correctly set 3 monitor outputs with different resolution/clock on newer kernel/intel driver

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=91900

            Bug ID: 91900
           Summary: Unable to correctly set 3 monitor outputs with
                    different resolution/clock on newer kernel/intel
                    driver
           Product: DRI
           Version: unspecified
          Hardware: x86 (IA32)
                OS: Linux (All)
            Status: NEW
          Severity: major
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: maurizio.berti at gmail.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 118113
  --> https://bugs.freedesktop.org/attachment.cgi?id=118113&action=edit
Xorg.0.log (separated with marks)

This setup used to work with xf86-video-intel version 2.21.15 and kernel
3.10.7:
VGA1: analog output to 1280x1024 - VGA connector
HDMI1: digital output to 1440x900 - DVI connector
HDMI2: digital output to 1280x1024 - HDMI connector
from left to right, total screen size: 4000x1024

Using the same kernel with driver 2.99.917 it is possible by manually and
respectively setting the resolution of HDMI1 to 1280x960, 1280x1024 and finally
1440x900 like this:

xrandr --output HDMI1 --off
xrandr --output HDMI2 --off
xrandr --output VGA1 --mode 1280x1024 --primary --output HDMI2 --mode 1280x1024
--right-of VGA1
xrandr --output HDMI1 --mode 1280x960
xrandr --output HDMI1 --mode 1280x1024
xrandr --output HDMI1 --mode 1440x900 --primary --right-of VGA1 --output HDMI2
--mode 1280x1024 --right-of HDMI1

With kernel 4.0.5 (latest stable for my distribution) it's not possible even
with this "workaround".

After talking on #intel-gfx I came up with some test outputs, this is the
sequence of what happens (with intel-2.99.917 and kernel-4.0.5) for the logs
I'll attach later, they are numbered according to the file name suffix:

00 - boot:
 outputs of boot after login shell

0 - startup, no xrandr commands:
 VGA1 ok (1280x1024)
 HDMI1 clone of VGA1 - correct resolution (1440x900)
 HDMI2 off
 actual screen size: 1440x1024

1 - run working xrandr script (sequence reported above)
 VGA1 ok
 HDMI1 clone of VGA1 (1280x1024)
 HDMI2 right of VGA1/HDMI1 (1280x1024)

2 - noscreen: disabling everything
 nothing

3 - vga1 only
 VGA1 ok
 HDMI1/2 off

4 - resetting
 VGA1 ok
 HDMI1 clone of VGA1
 HDMI2 ok (1280x1024) but at right of "ghost" HDMI1, x offset
1280(VGA1)+1440(HDMI1)

The command for "resetting" was:
xrandr --output VGA1 --crtc 2 --mode 1280x1024 --refresh 60 --left-of HDMI1
--output HDMI1 --crtc 0 --mode 1440x900 --refresh 60 --output HDMI2 --crtc 1
--mode 1280x1024 --refresh 60 --right-of HDMI1


System info:
i686 architecture
kernels 3.10.7-gentoo-r1 (working with workaround) and 4.0.5-gentoo
Gentoo Linux
i5-3570K CPU @ 3.40GHz
ASUS P8Z77-V LX

Attaching the Xorg log (for kernel 4) with 3 separation asterisks and
description to mark the different points.

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