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Actually I wanted to correct the well known Ubuntu brightness issue as addressed in this YouTubeVideo

In essence, the guy says to change the Nvidia driver from open source to any other proprietary one.

But I did a mistake of cancelling the change before it could successfully do it, thus not properly assigning the new one and not even going back to the old one.

It looked somewhat like this:

Software & Updates

And now I am stuck in the console mode. I have tried installing Nvidia-304 from there, but no luck.

I believe I need to reset some internal settings, but have no idea How To?.

Relevant log and configuration files:

Akshay Madan
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  • I think it is `50-synaptics.conf` only as it says in the log, that error in line 10 of `50-synaptics.conf`. Moreover the file before it does not even have a line 10. – Akshay Madan Feb 26 '15 at 14:39

2 Answers2

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You can try to boot ubuntu in recovery mode. (For how to boot in recovery-mode see this: How can I start in safe mode?).

When booting in recovery mode you will get a low resolution X, so you can log into your desktop and do changes.

From there you can open System Settings and the Additional Drivers and try again. After this you can boot again like normal to try your new configuration.

Community
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stalet
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Your /usr/share/X11/xorg.conf.d/20-intel.conf is malformed: it misses EndSection at its end. That's why Xorg complains that

[    23.187] Parse error on line 10 of section Device in file /usr/share/X11/xorg.conf.d/50-synaptics.conf
    "Section" is not a valid keyword in this section.

With EndSection missing, Xorg thinks, it's still inside the Section from 20-intel.conf when encountering the first non-empty, non-comment line 10 of the subsequent 50-synaptics.conf, and it doesn't like to start a new Section inside another Section.

Here's how it should look:

Section "Device"
    Identifier "card0"
    Driver "intel"
    Option "Backlight" "intel_backlight"
    BusID "PCI:0:2:0"
EndSection

You can safely delete /usr/share/X11/xorg.conf.d/20-intel.conf~.

David Foerster
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  • I did this but now, I think the file was not complete (as there was a missing EndSection) and now it shows [this](https://drive.google.com/file/d/0B84YXWltDOv-M1NyWkJhZEs2b1U/view?usp=sharing). And after I press okay it shows [this](https://drive.google.com/file/d/0B84YXWltDOv-ajV5UGttTGQzVTg/view?usp=sharing). I tried to reconfigure it and reset the generic settings(there was another option of backed up settings). And now the same above things appear but without mouse and little keyboard control. Though console mode still works, so if I could somehow complete the file then all this would end. – Akshay Madan Feb 27 '15 at 08:47
  • The issue you describe in your question (no running Xorg server at all) was caused by the syntax error in the Xorg configuration. Low graphics mode means, that Xorg is running, but it cannot load a graphics driver with hardware acceleration. This is a new issue, likely caused (as well?) by the driver installation you describe in your question. Please [open a new question](/questions/ask) and include your newly `/var/log/Xorg.0.log`. If you want, shoot me a message with a link to it and I'll see, what I can do. – David Foerster Feb 27 '15 at 11:41
  • [NikTh's](http://askubuntu.com/users/95393/nikth) answer to the question [How to fix “The system is running in low-graphics mode” error?](http://askubuntu.com/questions/141606/how-to-fix-the-system-is-running-in-low-graphics-mode-error) did it. Thanks to him and you too David. – Akshay Madan Feb 28 '15 at 03:30
  • Please don't forget to accept and/or upvote answers that you find useful (see [What should I do when someone answers my question?](/help/someone-answers)). – David Foerster Feb 28 '15 at 09:09