ubuntu-x-swat team mailing list archive

[Frédéric Meynadier <794474@xxxxxxxxxxxxxxxxxx>]

Follow up : the flicker lowered in intensity during the week end. It
came back after the first stand-by mode.

I found that bug #761065 maybe somewhat related, but I'm not sure.

I just tried the proposed workaround, i.e. set
/sys/module/i915/parameters/semaphores to "1", using the following
kernel option in /etc/default/grub

GRUB_CMDLINE_LINUX_DEFAULT="quiet splash i915.semaphores=1"

(again, I suspect i915 is the correct module for sandy bridge HD 3000,
but I'm not sure).

After running update-grub and rebooting, I still had flickering but the
amplitude of the flicker is different depending on the screen zone
(roughly 2/3 left : lower flicker, 1/3 right : same amplitude flicker).

Also there is a problem in  the screen size calculation (part of my
external monitor is duplicated on the laptop's screen) :

$ xrandr -q
Screen 0: minimum 320 x 200, current 3280 x 1080, maximum 8192 x 8192
LVDS1 connected 1600x900+0+0 (normal left inverted right x axis y axis) 310mm x 174mm
   1600x900       60.0*+   40.0  
   1440x900       59.9  
   1360x768       59.8     60.0  
   1152x864       60.0  
   1024x768       60.0  
   800x600        60.3     56.2  
   640x480        59.9  
VGA1 disconnected (normal left inverted right x axis y axis)
HDMI1 disconnected (normal left inverted right x axis y axis)
DP1 disconnected (normal left inverted right x axis y axis)
HDMI2 disconnected (normal left inverted right x axis y axis)
HDMI3 connected 1920x1080+1360+0 (normal left inverted right x axis y axis) 531mm x 298mm
   1920x1080      59.9*+
   1600x1200      60.0  
   1680x1050      60.0  
   1280x1024      60.0  
   1440x900       59.9  
   1280x960       60.0  
   1280x800       59.8  
   1024x768       60.0  
   800x600        60.3     56.2  
   640x480        60.0  
DP2 disconnected (normal left inverted right x axis y axis)
DP3 disconnected (normal left inverted right x axis y axis)

Screen has 3280 pixel width, where I should have 1600 + 1920 = 3520
pixels.... Looks like the driver thinks I have a 1360x768 laptop screen.
.config/monitors.xml has the correct size
(<width>1600</width><height>900</height>).

Weird...

-- 
You received this bug notification because you are a member of Ubuntu-X,
which is subscribed to xserver-xorg-video-intel in Ubuntu.
https://bugs.launchpad.net/bugs/794474

Title:
  latitude e6420 screen flickering (sandy bridge intel video card)

To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/794474/+subscriptions