[Bug 101423] New: Screen mode change corrupts display rendering

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=101423

            Bug ID: 101423
           Summary: Screen mode change corrupts display rendering
           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: victor.jesusx.lopez.carrillo at intel.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 131954
  --> https://bugs.freedesktop.org/attachment.cgi?id=131954&action=edit
kernel-log

System Environment
=======
======================================
 Graphic stack
======================================

======================================
      Software
======================================
kernel version              : 4.12.0-rc3-drm-tip-ww22-commit-187376e+
architecture                : x86_64
os version                  : Ubuntu 17.04
os codename                 : zesty
kernel driver               : i915
bios revision               : 4.6
bios release date           : 03/02/2017
hardware acceleration       : enabled
swap partition              : enabled on (/dev/sda2)

======================================
 Graphic drivers
======================================
mesa                        : 17.2.0-devel (git-18efb404cf
modesetting                 : enabled
modesetting compiled for    : 1.19.3 X.Org Video Driver
xorg-xserver                : 1.19.3
libdrm                      : 2.4.81
vaapi (intel-driver)        : Intel i965 driver for Intel(R) Haswell Mobile -
1.7.3
cairo                       : 1.14.8
intel-gpu-tools (tag)       : intel-gpu-tools-1.18-211-g00ce341b
intel-gpu-tools (commit)    : 00ce341b

======================================
      Hardware
======================================
platform                   : Haswell-Nuc
motherboard id             : D54250WYK
form factor                : Desktop
cpu family                 : Core i5
cpu family id              : 6
cpu information            : Intel(R) Core(TM) i5-4250U CPU @ 1.30GHz
gpu card                   : Intel Corporation Haswell-ULT Integrated Graphics
Controller (rev 09) (prog-if 00 [VGA controller])
memory ram                 : 7.72 GB
max memory ram             : 16 GB
display resolution         : 4864x2160
cpu thread                 : 4
cpu core                   : 2
cpu model                  : 69
cpu stepping               : 1
socket                     : Socket LGA1150
signature                  : Type 0, Family 6, Model 69, Stepping 1
hard drive                 : 223GiB (240GB)
current cd clock frequency : 450000 kHz
maximum cd clock frequency : 450000 kHz
displays connected         : DP-2 DP-6

======================================
      Firmware
======================================

======================================
      kernel parameters
======================================
quiet splash fastboot drm.debug=0xe

Regression?
=======
Unknown 

Bug detailed description
=====
==
The display renders incorrectly, a segment of it displays scrolled as if it
would render the first half in the second half or the bottom two quarters of
the screen instead of the first two quarters, or sometimes the screen gets
rendered 3 or 4 times though at a lower resolution scale, multiple times inside
the display.

Reproduce Steps
==============
Use xrandr to list the resolution and frequencies and manually change
resolutions from highest to lowest (including frequency changes), the error
will start happening at resolutions lower than 1440x900.

Expected Result
=============
Resolution and frequency should change correctly.

Actual Result
===========
Screen corruption.

Analysis & Root Cause
===================
Unknown, probably a misaligned buffer due to some exception.

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