*** This bug is a duplicate of bug 745112 ***
https://bugs.launchpad.net/bugs/745112
I just realized that on my Thinkpad T410 if I keep the external monitor
(connected via display port) off and then turn it on after my laptop is
on the ubuntu login screen, then log in, the external monitor
*** This bug is a duplicate of bug 745112 ***
https://bugs.launchpad.net/bugs/745112
Affects me on Toshiba m700 (w touchscreen) and Benq secondary monitor
results of sudo lshw -C display; cat /etc/lsb-release
*-display:0
description: VGA compatible controller
*** This bug is a duplicate of bug 745112 ***
https://bugs.launchpad.net/bugs/745112
same on TP T400
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https://bugs.launchpad.net/bugs/749817
Title:
natty regression: screen goes
*** This bug is a duplicate of bug 745112 ***
https://bugs.launchpad.net/bugs/745112
Affects me on Thinkpad T410 w/ Intel integrated graphics. External
screen connected via display port. Screen set to span both displays.
When I start the computer, external display is blank. Then I need to
*** This bug is a duplicate of bug 745112 ***
https://bugs.launchpad.net/bugs/745112
I have the same problem with sirovsky (#55). I have a Sony Vaio with
Intel on-board video card.
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*** This bug is a duplicate of bug 745112 ***
https://bugs.launchpad.net/bugs/745112
I have the exact same issue on my Thinkpad Edge 14 (Natty 32bit),
when working in the Classic session.
Upon plugging in an external monitor [via HDMI], (or when booting with
it plugged, after entering the
*** This bug is a duplicate of bug 745112 ***
https://bugs.launchpad.net/bugs/745112
I have a Samsung qx310 and I have been affected by the exact same behaviour -
always a black screen in the dock and while connecting the monitor directly
with the laptop.
I installed the kernel suggested in
This kernel seem to have another regression that about one time in
three, when suspending, it will hang with the 'suspend' and capslock
lights flashing.
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*** This bug is a duplicate of bug 745112 ***
https://bugs.launchpad.net/bugs/745112
Alright, well it is an experimental kernel and likely has its own new
bugs it brings, but we should stay focused on the original black screen
issue. (If you feel motivated, upstream would probably like to
Dear Martin,
regarding problem 1:
Using the notebook display as my left and the monitor as my right screen, I
observe this artifacts, that you describe:
- Context menus leave a rectangle painted with background behind (Gnome).
- Auto-hiding panels do not reappear when moving the mouse to the
OK, there are three problems related to external screens, with these
packages installed. Let me know if you want them to be filed
separately:
1- after connecting the external monitor (even if it's not turned on or
active) some windows are painted incorrectly, with bits of the desktop
background
actually 2 and 3 might have been due to the 'displays' control panel
being moved off screen when I switched monitors, and the fallback
timeout going off.
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Will just confirm this as well. Thinkpad L412 (could this be a thinkpad
specific problem?). Screen attached through VGA directly or through dock
results in black screen after logging in. GDM and terminals work fine on
both screens.
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Ah, the blank screen issues are apparently DPMS breakage in the kernel
specific to Arrandale graphics chips. Arrandale gfx appears to be used
in many recent thinkpad models, but aside from that it seems not to be a
thinkpad-specific issue.
I did up an X driver patch to try and work around the
Btw, there are getting to be a lot of differing bugs and issues
accumulating here in this report; let's please focus just on the black
screen issue with ext. monitor, since that's the title of the report.
Other various side issues like kernel BUGs or so on would be easier to
manage filed as new
2011-04-21 11:24:54 configure xserver-xorg-video-intel
2:2.14.0-4ubuntu8~lp747205~2 none
2011-04-21 11:24:54 status unpacked xserver-xorg-video-intel
2:2.14.0-4ubuntu8~lp747205~2
2011-04-21 11:24:54 status half-configured xserver-xorg-video-intel
2:2.14.0-4ubuntu8~lp747205~2
2011-04-21 11:24:54
I'm happy to say with that kernel installed this is fixed (at least in
my test). I can switch between internal, external, mirror and side-by-
side using fn-f7 both at the gdm prompt and in gnome classic. Thanks!
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I confirm this bug, too.
My setup:
Thinkpad X201 in Ultrabase connected to external monitor via hdmi-DVI (using
the original Lenovo hdmi to DVI converter).
All worked as expected in Ubuntu 10.10.
An additional remark:
Using only the external monitor doesn't work with the screen setup tool
When I rebooted with today's updates, I did not see the crash mentioned
in comment #39 and #40. I get mirrored screens on the text console and
at the gdm greeter screen. After logging in to Ubuntu Classic I
initially get a black screen, but pressing Fn-F7 does flip between
modes. Strangely
It's a bit more complicated: when I reconnected and tried to use the
external monitor, it was back to the original behaviour of showing just
black on both panels. With the monitor connected by vga over either the
ultrabase or built in vga port, I get the flickering red/black display.
Unplugging
With today's natty updates, if the external monitor is connected, the
machine crashes while booting, with this oops recorded:
Apr 10 17:47:45 joy kernel: [5.913652] BUG: unable to handle kernel NULL
pointer dereference at 0230
Apr 10 17:47:45 joy kernel: [5.913701] IP:
screenshot of crash
** Attachment added: IMG_0947.JPG
https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/749817/+attachment/2008997/+files/IMG_0947.JPG
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** Tags added: dual-head
** Tags added: black-screen
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Title:
natty regression: screen goes black when external monitor is connected
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** Package changed: xorg (Ubuntu) = xserver-xorg-video-intel (Ubuntu)
** Changed in: xserver-xorg-video-intel (Ubuntu)
Status: Incomplete = Confirmed
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bradm apparently saw problems with his external monitor go away when he
upgraded to kernel 2.6.38-8.40, so I wanted to confirm that has not
fixed this problem for me.
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I have an Thinkpad x201i and I can confirm the exact same behaviour -
always a black screen in the dock and while connecting the monitor
directly with the laptop.
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I can confirm this behaviour on a Thinkpad x201s. This is VERY annoing.
Btw. under certain circumstances I can get the second monitor to work,
but yet this is unreprocuable.
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RAOF So something's setting strangeness.
I don't suppose a guest mode login works?
Also, could you set the drm.debug=0x04 kernel parameter (either from the
command line, or via /sys/modules/drm/parameters/debug) and reproduce, then
attach dmesg and Xorg.0.log to the bug?
Attached is me
** Attachment added: Xorg.0.log
https://bugs.edge.launchpad.net/ubuntu/+source/xorg/+bug/749817/+attachment/1980553/+files/Xorg.0.log
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Title:
** Attachment added: Xorg.0.log.old
https://bugs.edge.launchpad.net/ubuntu/+source/xorg/+bug/749817/+attachment/1980554/+files/Xorg.0.log.old
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penguin42 suggested running intel_reg_dumper
** Attachment added: working-reg-dump
https://bugs.edge.launchpad.net/ubuntu/+source/xorg/+bug/749817/+attachment/1980572/+files/working-reg-dump
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I don't know if it's connected to the drm debug setting, but my mouse
now seems really jerky and unresponsive. I have to click several times
to make it respond. I did install other updates before rebooting so it
may be caused by something else.
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** Attachment added: black-regs
https://bugs.edge.launchpad.net/ubuntu/+source/xorg/+bug/749817/+attachment/1980670/+files/black-regs
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Title:
I don't have an option in gdm for a guest session. When I logged in to
a test account with little history, I get similar behaviour: it did
actually come up at first with only the internal monitor working.
Through the monitor control panel I could see the external monitor. It
thought it was in
(both samples were the same: once when running in my test account and
then again under my own account.)
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Title:
natty regression: screen goes
@Martin, alright I've fixed bug 749809, try running this to attach the
log files and such:
apport-collect 749817
** Changed in: xorg (Ubuntu)
Status: New = Incomplete
** Changed in: xorg (Ubuntu)
Importance: Undecided = High
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apport information
** Tags added: apport-collected compiz-0.9
** Description changed:
Binary package hint: xorg
I have a Thinkpad X201 connected through it's docking station/ultrabase
to a Dell 2709W monitor. This was working fine under Maverick; normally
with the internal monitor
** Attachment added: lspci-vvnn.txt
https://bugs.launchpad.net/bugs/749817/+attachment/1975274/+files/lspci-vvnn.txt
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Title:
natty
With the external monitor turned off, the laptop works ok in the base
station. I should also mention the monitor's connected to the base's
displayport port.
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Ok, and, very interesting, if I unplug the displayport cable and connect
across vga instead, then everything seems to work well (aside from being
a bit blurry.)
** Summary changed:
- natty regression: screen goes black when external monitor is connected
+ natty regression: screen goes black when
Actually, I'm not sure if this is correlated with the choice of display
connecter. It worked once over vga, but when I tried it again I just
got the black screen with white cursor, on another attempt the screen
just showed auto adjustment in progress, and one more time it just
showed flickering
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