Dear Maintainer,

*** Reporter, please consider answering these questions, where appropriate ***

   * What led up to the situation?
        normal use of the system
   * What exactly did you do (or not do) that was effective (or
     ineffective)?
        no modificion
   * What was the outcome of this action?
        slow render
   * What outcome did you expect instead?
        a fast displayed window
*** End of the template - remove these template lines ***

Hi,

I observed exactly the same problem. It seems that it was caused by X.org using
modesetting driver instead of intel (that it must have been using until
recently). Adding

Section "Device"
        Identifier  "Intel Graphics"
        Driver      "intel"
EndSection

to Xorg.conf has solved the problem.

notfound 834431 1:1.1.11-3
thanks

On Mon, 15 Aug 2016 18:07:16 +0200 Daniel Materka <daniel.materka@gmail.com> wrote:
 > Package: xdm
 > Version: 1:1.1.11-3
 > Severity: minor
 >
 > Dear Maintainer,
 >
 > *** Reporter, please consider answering these questions, where appropriate ***
 >
 > * What led up to the situation?
 > normal use of the system
 > * What exactly did you do (or not do) that was effective (or
 > ineffective)?
 > no modificion
 > * What was the outcome of this action?
 > slow render
 > * What outcome did you expect instead?
 > a fast displayed window
 > *** End of the template - remove these template lines ***

Hi,

In the follow-up to this report, Yegor observed the same slow painting and reported that switching from the modesetting
driver to the intel driver resolved it on his system. This points to a problem in the Xorg graphics stack at the time,
although the cause on the original reporter's system was not confirmed.

With no further information since 2016 and no identified xdm defect in this report, I am closing it. If the problem is
still reproducible with current Debian packages, please reopen the report and include the xdm and X server versions,
graphics hardware, and Xorg log.

Thanks,
Boyuan