[Bug 103223] New: Massive screen corruption on KMS startup under kernel-PAE-4.13.4-200.fc26.i686 in Acer Aspire One ZG5

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=103223

            Bug ID: 103223
           Summary: Massive screen corruption on KMS startup under
                    kernel-PAE-4.13.4-200.fc26.i686 in Acer Aspire One ZG5
           Product: DRI
           Version: DRI git
          Hardware: x86 (IA32)
                OS: Linux (All)
            Status: NEW
          Severity: critical
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: alexvillacislasso at hotmail.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Created attachment 134797
  --> https://bugs.freedesktop.org/attachment.cgi?id=134797&action=edit
journalctl of affected kernel

Kernel: kernel-PAE-core-4.13.4-200.fc26.i686
Machine: Acer Aspire One ZG5
Video outputs: one LCD display 1024x600, one VGA port with no monitor attached.

00:02.0 VGA compatible controller: Intel Corporation Mobile 945GSE Express
Integrated Graphics Controller (rev 03) (prog-if 00 [VGA controller])
        Subsystem: Acer Incorporated [ALI] Device 015b
        Flags: bus master, fast devsel, latency 0, IRQ 16
        Memory at 58480000 (32-bit, non-prefetchable) [size=512K]
        I/O ports at 60c0 [size=8]
        Memory at 40000000 (32-bit, prefetchable) [size=256M]
        Memory at 58500000 (32-bit, non-prefetchable) [size=256K]
        [virtual] Expansion ROM at 000c0000 [disabled] [size=128K]
        Capabilities: <access denied>
        Kernel driver in use: i915
        Kernel modules: i915

This is the same machine affected in bug
https://bugs.freedesktop.org/show_bug.cgi?id=98930 .

After updating to distro kernel 4.13.4 or 4.13.5, and rebooting, boot is normal
until KMS takes over, then the display on the LCD gets garbled in a square area
(800x800) at the left of the screen. The garbled area persists during the rest
of the startup and into the login screen and makes the display unusable.

Previous kernel kernel-PAE-4.12.14-300.fc26.i686 does not garble the display,
although it still shows a backtrace as described in #98930, as this is the
exact same machine.

Version-Release number of selected component (if applicable):
kernel-PAE-4.13.4-200.fc26.i686

How reproducible:
Always

Steps to Reproduce:
1. Acer Aspire One ZG5 32-bit with Fedora 26 and
kernel-PAE-4.13.4-200.fc26.i686
2. Boot with updated kernel
3.

Actual results:
Garbled screen in a square section when KMS takes over.

Expected results:
No screen corruption.

Additional info:
Using journalctl I have captured a dmesg output of the affected kernel. Look
for the string "plane B assertion failure, should be off on pipe B but is still
active".

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