[Bug 635339] [NEW] [Maverick] Configuring displays leads to flickering screen on HP Elitebook 8440p with kernel 2.6.35-20

[Jan Nekvasil]

Public bug reported:

In current Maverick with kernel 2.6.35-20 on a HP Elitebook 8440p,
configuring displays with with xrandr or gnome-display-properties leads
to heavy flickering screen, regardless whether on the laptop display or
on an external monitor connected trough D-sub cable. The mouse cursor is
however still visible and responding. The result looks like the good old
out-of-sync problem known from old CRT's - indeed, one of the LCD
monitors which I have tested reports that with OSD text.

Xrandr detects both displays normally as DP1 (laptop) and VGA1 with
correct refresh rates. Before the 2.6.35-20 (which finally fixed bug
#570604) gnome-display-properties didn't work either (resulting in black
screen), but I was able to use xrandr.

** Affects: linux (Ubuntu)
     Importance: Undecided
         Status: New

** Summary changed:

- [Maverick] Managing displays leads to flickering screen on HP Elitebook 8440p with kernel 2.6.35-20
+ [Maverick] Configuring displays leads to flickering screen on HP Elitebook 8440p with kernel 2.6.35-20

** Description changed:

- In current Maverick with kernel 2.6.35-20 on a HP Elitebook 8440p, configuring displays with with xrandr
- or gnome-display-properties leads to heavy flickering screen, regardless whether on the laptop display or on an external monitor connected trough D-sub cable. The mouse cursor is however still visible and responding. The result looks like the good old out-of-sync problem known from old CRT's - indeed, one of the LCD monitors which I have tested reports that with OSD text. 
+ In current Maverick with kernel 2.6.35-20 on a HP Elitebook 8440p,
+ configuring displays with with xrandr or gnome-display-properties leads
+ to heavy flickering screen, regardless whether on the laptop display or
+ on an external monitor connected trough D-sub cable. The mouse cursor is
+ however still visible and responding. The result looks like the good old
+ out-of-sync problem known from old CRT's - indeed, one of the LCD
+ monitors which I have tested reports that with OSD text.
  
  Xrandr detects both displays normally as DP1 (laptop) and VGA1 with
  correct refresh rates. Before the 2.6.35-20 (which finally fixed bug
  #570604) gnome-display-properties didn't work either (resulting in black
  screen), but I was able to use xrandr.

-- 
[Maverick] Configuring displays leads to flickering screen on HP Elitebook 8440p with kernel 2.6.35-20
https://bugs.launchpad.net/bugs/635339
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