Red Hat Bugzilla – Bug 436636
killing/switching the intel X server blacks out LCD
Last modified: 2008-03-20 14:50:07 EDT
Description of problem:
When the X server starts switching back to the virtual consoles does not work -
one gets a view of the virtual console for a split second and then a blank
screen. Switching back to X works.
Also killing the server with init 3 doesn't restore the consoles either.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1.simply boot into X
2.try to switch to a virtual console or init 3
access to visible virtual consoles
00:02.0 VGA compatible controller: Intel Corporation Mobile GM965/GL960
Integrated Graphics Controller (rev 03)
00:02.1 Display controller: Intel Corporation Mobile GM965/GL960 Integrated
Graphics Controller (rev 03)
Forgot to add that this is a recent regression, it worked until a couple of days
Thanks for the bug report. We have reviewed the information you have provided
above, and there is some additional information we require that will be helpful
in our diagnosis of this issue.
Please attach your X server config file (/etc/X11/xorg.conf) and X server log
file (/var/log/Xorg.*.log) to the bug report as individual uncompressed file
attachments using the bugzilla file attachment link below.
We will review this issue again once you've had a chance to attach this information.
Thanks in advance.
Created attachment 297521 [details]
xorg.conf for which the backlight stays dark in virtual consoles
It also happens w/o any xorg.conf, e.g. letting the X server using the built in
Created attachment 297524 [details]
Xorg.0.log for the black virtual consoles
starting gdm (through init 5) and then Ctrl-Alt-F1. The latter switch causes
the following output in the log:
--- before-switching/Xorg.0.log 2008-03-10 23:46:23.000000000 +0200
+++ after-switching/Xorg.0.log 2008-03-10 23:49:48.000000000 +0200
@@ -492,3 +492,6 @@
(**) AT Translated Set 2 keyboard: XkbModel: "evdev"
(**) Option "XkbLayout" "us"
(**) AT Translated Set 2 keyboard: XkbLayout: "us"
+(II) AIGLX: Suspending AIGLX clients for VT switch
+(II) intel(0): xf86UnbindGARTMemory: unbind key 0
+(II) intel(0): xf86UnbindGARTMemory: unbind key 1
Unfortunately the latest updates have made things worse. Now if the backlight is
turned off (killing/switching of the X server, be it by logging out, init 3,
swicthing to virtual consoles etc.) it never turns on again, not even when
restarting X or trying to switch back to the X console.
When rebooting via kexec the backlight is turned on *after* the kernel is booted.
Is there a way to manually turn the backlight back on?
Created attachment 298726 [details]
"# XXX rebase me plz"
Created attachment 298727 [details]
Patch tp specfile to apply the rebased patch
While poking around to find a fix I read in the specfile about the
intel-2.1.1-fix-vt-switch.patch that needed a rebase to current sources. Hoping
that this would fix my issue I did the rebase (hopefully correct), but it didn't
solve the issues I described.
Anyway it may be of use so I added them to this report.
Furthermore it looks like this bug may be related to the bug on
There the issues are with X starting into a blank screen, while I only see it
after X is switched to vts or trying to switch back to X/restart X.
Also I verified that at least when the screen *appears* blank in X or vts in
reality it is just the backlight that is turned off (one can see the consoles or
the gdm login screen with a flashlight).
OK, I found bug #436556 and tested the workaround with modprobing video and this
saved my day. Closing as duplicate, although you may want to take a look at the
rebased patch in the attachments.
*** This bug has been marked as a duplicate of 436556 ***