Bug 109021

Screen often flickers when using CR key or up-down cursor key to scroll the
xterm, especially when in auto repeat doing a fast scroll.

Was OK in 4.3.0 - first appears in 4.4-rc1 and still present in 4.4-rc3 and
4.4-rc4.

I found a more reliable/repeatable test is (with auto-repeat enabled) to
press any keyboard key (eg CR or hash) continuously and move mouse around
within the same xterm (or vte). The whole screen area below the mouse
flickers and is slightly darker than the top of the screen.

Using "xset r off" to turn off auto-repeat and then typing hash rapidly while
moving the mouse in the window also produced flicker.

I get the flicker problem with xterm and vte -- but all is ok with rxvt and
xfce4-terminal.

I tried to see what "xwd" would capture of the screen - but while xwd is
waiting for the mouse button to be pressed the screen is always stable - the
flicker appearing again only after the mouse button is pressed.

There are no errors logged during the flicker.

I normally use icewm but get the same results with twm.

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Hardware:
  Asus P7H55-M SI with Intel Core i5 processor
  and Integrated Graphics [i915 driver].

Currently using a keyboard connected to a PS/2 keyboard port and using a
USB connected mouse.

Distro: Slackware-14.1, but with newer kernel.

xterm -version  gives :-  X.Org 7.6.0(297)

twm version 1.0.8