[Bug 110303] New: [regression, bisected] vt console display doesn't update with psr

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=110303

            Bug ID: 110303
           Summary: [regression, bisected] vt console  display doesn't
                    update with psr
           Product: DRI
           Version: XOrg git
          Hardware: Other
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: DRM/Intel
          Assignee: intel-gfx-bugs at lists.freedesktop.org
          Reporter: michal at physics.ubc.ca
        QA Contact: intel-gfx-bugs at lists.freedesktop.org
                CC: intel-gfx-bugs at lists.freedesktop.org

On a Dell XPS13 9343, with kernels newer than 4.17, a vt switch (CTRL-ALT-Fn)
to a console vt has become unusable if psr is enabled. Any console output only
appears after a long delay (or in more recent kernels only after a vt switch
away and back).

I bisected to this commit:
75cbec033c08f6d41c4775784f66ab860d02a6b5

In current drm-tip the problem is still there. If I comment out setting
EDP_PSR_DEBUG_MASK_DISP_REG_WRITE in intel_psr.c
then the vt behaves as expected.

This is a Broadwell machine:
#lspci:
00:02.0 VGA compatible controller: Intel Corporation HD Graphics 5500 (rev 09)

I realize that psr isn't exactly supported on BDW - though I've been using it
for years and have never seen the lockups that people complained about that led
to its being turned off by default.

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