Red Hat Bugzilla – Bug 436556
i810 driver darkened as of version 2.2.1
Last modified: 2008-03-26 23:40:43 EDT
Description of problem:
Since version 2.2.1-1 the i810 drives constantly gives me a blacked out screen,
with no or very very little backlight. It still works though, I can reboot if I
can find the cursor in the blackness (GDM greeter is barely visible) or switch
to a console and type in the blind. I tried later versions of 2.2.1-X all have
the same problem.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
GDM is very dark, no backlight. Driver unusable.
Switching back to 2.2.0-4 works flawlessly. Anything backlight-related or DDC
thing got messed up in 2.2.1? Perhaps I need to take this upstream :-/
This is a HP Compaq nc2400
00:02.0 VGA compatible controller: Intel Corporation Mobile 945GM/GMS,
943/940GML Express Integrated Graphics Controller (rev 03)
00:02.1 Display controller: Intel Corporation Mobile 945GM/GMS, 943/940GML
Express Integrated Graphics Controller (rev 03)
Some lspci -n -v figures:
00:02.0 8086:27a2 (rev 03)
00:02.1 8086:27a2 (rev 03)
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.
Could you please also try to run without any /etc/X11/xorg.conf whatsoever and
let X11 autodetect your display and video card? Attach to this bug
/var/log/Xorg.0.log from this attempt as well, please.
We will review this issue again once you've had a chance to attach this information.
Thanks in advance.
If you can manage to log in, can you try to do a `xrandr -o inverted ; xrandr -o
normal` and see if it helps? If so, you're probably hitting
Created attachment 297369 [details]
Same problem here with a Thinkpad T61. Backlight stays off after gdm loads.
Typing "xbacklight -set 100" blind into a gnome-terminal after logging in works
Created attachment 297370 [details]
Here is the Xorg.0.log when using the standard kernel (i.e. not the new
i915.modeset=1 stuff). Interestingly, this problem doesn't happen with
i915.modeset=1 turned on.
Created attachment 297604 [details]
Xorg.0.log without config file
This is a log taken without any xorg.conf file
(as can be verified by the (EE) message).
The bahaviour changed now!
Now the screen come on but whenever you
press Ctrl+Alt+F1 to switch to a console, the
screen backlight dies in the same manner that it
died spontaneously before.
No, wait the behaviour does not change. I should be VERY
clear of how the problem manifests:
The FIRST TIME an X server starts up, backlight is on. If
you stop the X server and then starts another one, it goes
off. If you start an X server and tries to switch to a
console, it goes off.
The reason I thought the behaviour changed was that I booted
the kernel into single-user mode and then started X with
"init 5". This way the initial RHGB X server is never run
(this normally works) so the first X server session started
is the one running GDM and the first login screen.
Fast-user-switch (which opens a secondary X server) also
kills the backlight.
Workaround (tested successfully on thinkpad x61s):
Boot into init 3 by appending '3' to the kernel grub line. Then login as root,
'modprobe video' and 'init 5' and the backlight should work as normal. For some
reason the 2.6.25 rawhide kernels don't autoload the 'video' kernel module like
the fc8 kernels.
*** Bug 437600 has been marked as a duplicate of this bug. ***
*** Bug 437518 has been marked as a duplicate of this bug. ***
I can confirm that the workaround in comment #7 works for me on a T61.
*** Bug 436636 has been marked as a duplicate of this bug. ***
This is probably related to the upstream bug
There are some patches attached to bug 436636
xorg-x11-drv-i810-2.2.1-15.fc9 fixed this on my machine.
xorg-x11-drv-i810-2.2.1-15.fc9 works for me too.
*** Bug 439063 has been marked as a duplicate of this bug. ***