[Bug 106494] New: IVB, KBL - Under Gnome, screen won't unblank without VT switch, UXA only

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=106494

            Bug ID: 106494
           Summary: IVB, KBL - Under Gnome, screen won't unblank without
                    VT switch, UXA only
           Product: xorg
           Version: git
          Hardware: x86-64 (AMD64)
                OS: Linux (All)
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/intel
          Assignee: chris at chris-wilson.co.uk
          Reporter: tod.jackson at gmail.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org

Created attachment 139531
  --> https://bugs.freedesktop.org/attachment.cgi?id=139531&action=edit
Xorg log

Hi,

I first noticed this little bug a few months ago on my old Ivybridge laptop,
then saw it again today on my Kabylake laptop. Due to heavy flickering in
Chrome with SNA I still like to use UXA (this bug doesn't happen with SNA or
modesetting).

Unblanking the screen shows a visible cursor but a black screen unless I do a
VT switch, then the unlock window to enter credentials appears.

This seems to be present on the old Gnome and graphics stack from Debian Jessie
as well as an up-to-date Debian Sid.

This doesn't happen when resuming from suspend.

I have the latest xf86-video-intel from git with debugging enabled if anyone
wants to poke at this.

I attached Xorg.0.log and dmesg; some of the noise earlier is me testing
suspend.

The main way to test is just to go to Power in settings and set "Blank screen"
to 1 minute. Further complicating things is that if you do "xset dpms force
off" this issue doesn't happen either, making me think screen locking is
involved.

Thanks!

Tod

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