Intel GMA 4500M on 15.6" HD LCD
in acer travelmate 5735Z
screen is black after boot screen.
kernel 3.x problem.
see https://bugs.launchpad.net/ubuntu/+source/xserver-xorg-video-intel/+bug/744187 and others.
i keep approx. 10 gnu/linux systems running.
with kernel 3.x, i experienced the black screen problem on laptops for quite a long time now. i could solve the problem with workarounds which worked for some time, then the black screen problem came back again -- probably due to updates (?). so i reinstalled older systems which are outdated by now (no updates). ---- and i waited ...
lastly, i could install without problems newer systems on 6 machines (asus 1215b, lenovo, acer, desktop computers), so i wanted to update the other systems as well.
today i tried once again ubuntu 12.04, kubuntu 12.04, linux mint 13 both in 32 bit and 64 bit versions on the acer travelmate 5735Z -- still the same problem, or worse than before: black after the boot screen even with live-cd (which used to work before).
i cannot live with "workarounds" in such an important feature, especially when they don't seem to fix things once and for all. ---- i need totally robust systems for my users.
THIS problem makes my life really hard SINCE A VERY LONG TIME AND AFTER EVERYTHING WORKED SO WELL. it is very difficult to explain people since 2011 or so that i simply cannot help them -- after i talked them into using gnu/linux; and it costs me too much time.
best wishes, topgyal
Looks like this is a bug of the graphics drm driver issue.
Please try booting with the i915.invert_brightness=1 module parameter. (Many live CDs will allow you to edit the kernel command line before booting too.)
If this helps, please attach output of 'lspci -vmmnn' on your machine.
Ping, please try the suggestion from comment #2 and report back.
(In reply to comment #2)
> Please try booting with the i915.invert_brightness=1 module parameter. (Many
> live CDs will allow you to edit the kernel command line before booting too.)
> If this helps, please attach output of 'lspci -vmmnn' on your machine.
topgyal, please provide the info to make some progress on this bug.
I have the same problem. So I tried it:
> admini@laptop2 ~ $ modprobe -v -a i915.invert_brightness=1
> WARNING: Module i915.invert_brightness=1 not found.
I also tried:
> admini@laptop2 ~ $ insmod -v i915.invert_brightness=1
> insmod: can't read '-v': No such file or directory
> admini@laptop2 ~ $ insmod i915.invert_brightness=1
> insmod: can't read 'i915.invert_brightness=1': No such file or directory
> admini@laptop2 ~ $ insmod i915.invert_brightness
> insmod: can't read 'i915.invert_brightness': No such file or directory
Created attachment 101181 [details]
Output of lspci -vmmnn without loading module
Also I wasn't able to run the module, I tried lspci -vmmnn. Here's the result.
(In reply to comment #5)
> I have the same problem. So I tried it:
What makes you think you have the same problem?
> > admini@laptop2 ~ $ modprobe -v -a i915.invert_brightness=1
> > WARNING: Module i915.invert_brightness=1 not found.
That should be 'modprobe i915 invert_brightness=1'. But are you sure you don't already have i915 loaded at that point? 'lsmod | grep i915' should tell you.
To be on the safe side, you should try adding i915.invert_brightness=1 to the kernel command line in your boot loader instead.
(In reply to comment #7)
> What makes you think you have the same problem?
Because I also have an Acer Travelmate with an Intel GMA 4500mh(I don't know if the letters are true because the laptop doesn't work at the moment) Chip and When I searched on the internet, I found out that this is a problem of the blacklights.
> That should be 'modprobe i915 invert_brightness=1'. But are you sure you
> already have i915 loaded at that point? 'lsmod | grep i915' should tell you.
> To be on the safe side, you should try adding i915.invert_brightness=1 to the
> kernel command line in your boot loader instead.
I will try it, when I set up the laptop with Linux Mint 15 in some days.
Created attachment 106641 [details]
the output of lspci -vmmnn after the modprobe command
Sorry for writing back so late.
I have successfully excuted the modprobe command. Then I've created this new output of lspci -vmmnn.
Thomas131, you say that you have successfully executed the modprobe command. Does that mean having i915.invert_brightness=1 module parameter makes a difference or not? Does the screen light up with the parameter, but not without the parameter? This is the crucial question.
Thanks for writing back. Sorry for my late answer. I have had problems to log in to bugzilla. So I gave up about 5 times.
The modprobe command doesn't seem to work. The boot parameters worked!
Shotgun approach patch sent to use inverted brightness for all gen4 gm45 acers.
Presumed fixed by
Author: Jani Nikula <email@example.com>
Date: Fri Sep 20 15:05:30 2013 +0300
drm/i915: assume all GM45 Acer laptops use inverted backlight PWM
which on its way to 3.13.
This fix broke already working laptop displays (as of 3.12) (Acer Extensa 5635Z)
Looks like we'll have to revert the fix referenced in comment #13 due to regressions, and reopen this bug.
Revert is on its way.
Revert is merged, thanks for reporting this regression.
(In reply to Daniel Vetter from comment #17)
> Revert is merged, thanks for reporting this regression.
Daniel, you got it backwards. This needs to be reopened because the fix was reverted. :)
The fix has been merged to drm-intel-nightly as
Author: Jani Nikula <firstname.lastname@example.org>
Date: Mon Jan 13 17:30:34 2014 +0200
erm/i915: quirk invert brightness for Acer Aspire 5336
It should eventually flow back to stable kernels. Thanks for the report.
(In reply to Jani Nikula from comment #19)
> commit e107db4002a5cb98db1b3e121f47cf5d31d5a704
Make that d2ce50dd1cc9e702428b7fe761aa6e46e758068c