6420 was one of the original eDP machines, it should be fully supported
now.
** Changed in: xserver-xorg-video-intel (Ubuntu)
Status: New = Fix Released
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For your information:
This bug exists obviously on more machines than one, but not on all Dell
Latitude e6420 machines, but on some others.
I guess it has something to do with the video card installed, anyway, I already
filed a bug report back in 3/2011.
Upstream bug:
Actually, SEC appears to be Samsung in the T420s.
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https://bugs.launchpad.net/bugs/794474
Title:
latitude e6420 screen flickering (sandy bridge intel video card)
To manage
SEC stands for Seiko Epson Corp. LGD for LG. I observe the same screen
flicker with the SEC panel in my Lenovo T420s. I'll call to get the
screen replaced, hopefully to a LG panel.
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I can confirm this bug is occurring on 11.04 Dell D6420 Intel Sandybridge Intel
Video chipset.
It seems to occur when you try to user multiple monitors. Looks like it may be
switching to 40 Hz refresh
rate even though xrandr reports it at 60 Hz. Using the latest from edgers/ppa.
There are
OK, I finally made it work : using the GUI offered by unity, setting the
resolutions I wanted, and not caring that the display was mangled when
it asked me if the display was OK after setting the resolutions... I
checked yes even if that was not true, so the config was saved (in
New follow-up : today,
$ xrandr
Screen 0: minimum 320 x 200, current 3520 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*
[...]
HDMI3 connected 1920x1080+1600+0 (normal left inverted right x axis
Dell has replaced the screen. No flicker any more but it is still quite
difficult to set the resolutions (when setting the desired ones, ie
1600x1900 1920x1080) some parts of the screen remain black, and among
this black parts some let the cursor visible (but only the cursor, i.e.
dragging a
On my side I bought the very same laptop with Nvidia VM4200 card and everything
works like a charm (resolution, external display, suspend to ram).
I remastered the Intel based laptop (the one that flickers) with Win7 only and
it works like a charm on Win7 (no flickering at all).
I do believe
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
Oh, I forgot to mention : dmesg contains the following message
(apparently provoked by switching from X mode to console, and vice-
versa) :
[drm:drm_mode_getfb] *ERROR* invalid framebuffer id
If this is a kernel issue, here is mine :
Linux [hostname] 2.6.38-8-generic #42-Ubuntu SMP Mon Apr 11
** Tags added: flicker
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Title:
latitude e6420 screen flickering (sandy bridge intel video card)
To manage notifications about this bug go to:
** Package changed: xorg (Ubuntu) = xserver-xorg-video-intel (Ubuntu)
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Title:
latitude e6420 screen flickering (sandy bridge intel video card)
** Tags added: edgers
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https://bugs.launchpad.net/bugs/794474
Title:
latitude e6420 screen flickering (sandy bridge intel video card)
To manage notifications about this bug go to:
I experience a similar problem : 1600x900 screen, intel video, ubuntu
11.04, dell e6420 received 2 days ago, started flickering after waking
up from a standby mode this afternoon.
Also a HW problem, as it happens also on the Win7 install that is
installed alongside. In fact it flickers as soon as
I forgot to add my follow-up.
It's actually very strange. Here are my results:
* If I boot with nomodeset, there is no flickering but I cannot use any
external display (my monitor appears in X.log but not seen by xrandr)
* If I boot without nomodeset (and with xorg-edgers ppa) with my external
Actually it seems to be a HW related issue as moving the laptop in
another office solves the flickering issue.
Though, the latest xorg-edgers packages broke the external VGA output,
but it's not related to this issue.
** Changed in: xorg (Ubuntu)
Status: New = Invalid
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** Package changed: ubuntu = xorg (Ubuntu)
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Title:
latitude e6420 screen flickering (sandy bridge intel video card)
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