[Bug 101620] New: Corrupted display in graphical Emacs with HEAD intel and SNA

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=101620

            Bug ID: 101620
           Summary: Corrupted display in graphical Emacs with HEAD intel
                    and SNA
           Product: xorg
           Version: git
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/intel
          Assignee: chris at chris-wilson.co.uk
          Reporter: wingo at igalia.com
        QA Contact: intel-gfx-bugs at lists.freedesktop.org

Hello,

Since updating to intel xorg driver b57abe20e81f4b8e4dd203b6a9eda7ff441bc8ce
and still the case with git master, graphical-mode Emacs shows corruption when
using SNA (the default).  I am on a thinkpad x1 carbon 3rd gen, but many other
people see this on other machines:

  https://lists.gnu.org/archive/html/guix-devel/2017-06/msg00263.html

I see corruption ranging from what appears to be tiles not updating but also
small issues like certain letters not rendering.  I work around it, very sadly,
with M-x redraw-display, which always fixes the display.  I guess there is some
incremental update path that graphical Emacs hits that I don't see usually.  I
run in Gnome Shell FWIW so there is a compositor in the middle.

I don't know when this started, as I don't update very frequently.  It only
happens in graphical Emacs; no other program.  Although Emacs had updated when
I upgraded Xorg, I tried running the older, known-working copy as well and had
the same issues with run under the new Xorg driver.  Setting the system to use
UXA instead of SNA fixes the issue.

We have many people that would be happy to test any proposed fixes :)  Thanks
for all your work over the years and thanks in advance for having a look!

Andy

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