[Bug 95176] New: LCD flickering on Thinkpad T440p (Haswell) with kernel 4.6-rc4 (PSR enabled)

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=95176

            Bug ID: 95176
           Summary: LCD flickering on Thinkpad T440p (Haswell) with kernel
                    4.6-rc4 (PSR enabled)
           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: calvin.walton at kepstin.ca
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

Hi,

Following updating to 4.6-rc kernels (with psr enabled by default), the screen
on my ThinkPad T440p (Intel i5-4330M, igpu) has started to flicker
occasionally. The screen will go black for around 1-2 frames during times of
low activity (it immediately returns to showing the screen again afterwards).

Using the i915.enable_psr=2 or i915.enable_psr=3 makes no difference; the
screen flickers occur with both settings. Only setting enable_psr=0 stops the
issue completely.

I'm running GNOME 3.20 on Wayland; haven't tried X11.

i915_edp_psr_status: (with enable_psr=-1)
Sink_Support: yes
Source_OK: yes
Enabled: yes
Active: yes
Busy frontbuffer bits: 0x000
Re-enable work scheduled: no
Main link in standby mode: no
HW Enabled & Active bit: yes
Performance_Counter: 2397286

PCI ids:
00:02.0 VGA compatible controller [0300]: Intel Corporation 4th Gen Core
Processor Integrated Graphics Controller [8086:0416] (rev 06) (prog-if 00 [VGA
controller])
    Subsystem: Lenovo ThinkPad T440p [17aa:220e]

I haven't yet tried getting the drm debug logs or running the intel-gpu-tools
psr test case; I'll do that later today and attach the results here.

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