[Bug 91745] New: Xorg intel driver makes console unsynced

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=91745

            Bug ID: 91745
           Summary: Xorg intel driver makes console unsynced
           Product: xorg
           Version: 7.7 (2012.06)
          Hardware: Other
                OS: All
            Status: NEW
          Severity: normal
          Priority: medium
         Component: Driver/intel
          Assignee: chris at chris-wilson.co.uk
          Reporter: samuel.thibault at ens-lyon.org
        QA Contact: intel-gfx-bugs at lists.freedesktop.org

Hello,

I have installed a brand new HP EliteBook 820 G2 with Debian Stretch, which
includes the Xorg server version 1.17.2 and the Intel driver 2.99.917.

At boot, the Linux console is fine. Then I start Xorg, and when I get back to
the console (either through quitting Xorg or ctrl-alt-f2), the console output
comes back, but the horizontal synchronization seems to be nonfunctional: the
output keeps scrolling horizontally. I can type text, run commands, etc. so
it's really just the output which is buggy.

One very odd thing is that if I consume CPU (e.g. through while true ; do : ;
done), the display becomes perfectly stable and the console is usable again.
This doesn't depend on the CPU which I run that on. I guess this may be related
with CPU sleep modes.

Downgrading the Xorg server to 1.16.4 and the intel driver to 2.21.15 fixes the
issue, I'll probably try to bisect a bit (at least try to use the same Xorg
server)

This is basically making my laptop unusable for my work without a downgrade :)

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