FedoraForum.org - Fedora Support Forums and Community
Results 1 to 5 of 5
  1. #1
    Join Date
    Dec 2012
    Location
    santa barbara, CA
    Posts
    882

    installed, upgraded, lost screen backlighting

    Hi guys,

    in Japan at the moment. I just bought a new Vaio for wifey, a large screen one VJS15 I think and after installing FC27 from the Live LXDE spin, (I didn't let Win10 get past the emergency omg omg wth screens lol), I did a dnf upgrade.
    When the comp came back up, the screen lighting turns OFF at the lxdm login screen.
    Tried all the blue buttons to no avail.

    Luckily I had a small led flashlight, which allowed me to sorta see the screen, so I rebooted, and went back to its default install 4.13.9-300 , which works fine.

    Any clues ?
    here is the inxi and Xorg.old files
    inxi.out.txt
    Xorg.0.log.old.txt

    EDIT: actually the screen turns off during the white fedora logo "fillup" procedure already
    "monsters John ... monsters from the ID..."
    "ma vule teva maar gul nol naya"

  2. #2
    Join Date
    Dec 2012
    Location
    santa barbara, CA
    Posts
    882

    Re: installed, upgraded, lost screen backlighting

    Update on this post.

    Back home, reinstalled the box.
    If I install FC27 from a live USB stick, all works fine. But as soon as I upgrade the kernel to the latest, I lose the backlight.
    Installing FC28 beta, screen backlight is off from the getgo.

    I tried also with Manjaro, same thing. Installing from the Live USB works fine, until I go upgrade, after that, backlight is OFF.

    I tried rebooting with kernel parameters: acpi_backlight=native i915.invert_brightness=1 to no avail.

    Luckily I can connect an external Monitor via HDMI, and it mirrors the screen just fine, and works just fine, so I can continue to debug.


    BTW, this is the first Vaio with issues. lolm, just after I made my speeches. typical LOOL
    "monsters John ... monsters from the ID..."
    "ma vule teva maar gul nol naya"

  3. #3
    Join Date
    Dec 2012
    Location
    santa barbara, CA
    Posts
    882

    Re: installed, upgraded, lost screen backlighting

    In the following folder:
    Code:
    [yuko intel_backlight]# pwd
    /sys/class/backlight/intel_backlight
    [yuko intel_backlight]# ls -lsca
    total 0
    0 drwxr-xr-x 3 root root    0 30. Apr 13:17 .
    0 drwxr-xr-x 6 root root    0 30. Apr 13:17 ..
    0 -r--r--r-- 1 root root 4096 30. Apr 13:20 actual_brightness
    0 -rw-r--r-- 1 root root 4096 30. Apr 13:21 bl_power
    0 -rw-r--r-- 1 root root 4096 30. Apr 13:20 brightness
    0 lrwxrwxrwx 1 root root    0 30. Apr 13:20 device -> ../../card0-eDP-1
    0 -r--r--r-- 1 root root 4096 30. Apr 13:20 max_brightness
    0 drwxr-xr-x 2 root root    0 30. Apr 13:20 power
    0 lrwxrwxrwx 1 root root    0 30. Apr 13:17 subsystem -> ../../../../../../../class/backlight
    0 -r--r--r-- 1 root root 4096 30. Apr 13:20 type
    0 -rw-r--r-- 1 root root 4096 30. Apr 13:20 uevent
    I have the following values:
    Code:
    [yuko intel_backlight]# cat actual_brightness 
    7500
    [yuko intel_backlight]# cat bl_power 
    0
    [yuko intel_backlight]# cat brightness 
    7500
    [yuko intel_backlight]# cat max_brightness 
    7500
    [yuko intel_backlight]# cat type
    raw
    [yuko intel_backlight]# cat uevent 
    [yuko intel_backlight]#
    I tried "echo 1 > bl_power" , but it doesn't do anything.
    "monsters John ... monsters from the ID..."
    "ma vule teva maar gul nol naya"

  4. #4
    Join Date
    Dec 2012
    Location
    santa barbara, CA
    Posts
    882

    Re: installed, upgraded, lost screen backlighting

    Update: this thread here is about the exact same issue: (the Intel 591b (rev 04))
    https://bbs.archlinux.org/viewtopic.php?id=230374
    found another thread on this:
    https://bbs.archlinux.org/viewtopic.php?id=230541&p=2

    Apparently it all boils down to:
    full HD laptop-embedded LCD screen. Apparently, the chip driving this monitor is not informing correct values of DPCD to the intel driver (i915) and thus the black screen perceived at boot time. The patch from Jani Nikula, from intel, bypasses some of the eDP spec checks because of this buggy behavior.
    the funky thing is that I would have to modify the kernel to patch it. And I don't really wanna do that, not on wifey's new PC which is supposed to work out of the box. hmmmmmmmmmm

    booting with acpi=off noacpi in the grub.cfg seems to at least have kept the monitor up, but the display manager is not coming up. We shall see, will play with this further. Only other option would be to go back to Centos7.
    Last edited by bobx001; 30th April 2018 at 01:15 PM.
    "monsters John ... monsters from the ID..."
    "ma vule teva maar gul nol naya"

  5. #5
    Join Date
    Dec 2012
    Location
    santa barbara, CA
    Posts
    882

    Re: installed, upgraded, lost screen backlighting

    Booting with acpi=off works though. However, do I then lose automated fan control ?
    The Laptop will always be plugged in, so I don't need any battery optimization power management.

    Will test it like this, and see if I can get sensors to show me cpu speed/temp and fan.
    "monsters John ... monsters from the ID..."
    "ma vule teva maar gul nol naya"

Similar Threads

  1. Upgraded to rawhide, lost touchpad ans touchscreen, mouses work
    By Elv13 in forum Fedora 13 Development Branch
    Replies: 3
    Last Post: 6th February 2010, 01:52 AM
  2. Q: Upgraded FC9->FC10 = booting and after anacron..BOOM! display lost!
    By funksterX in forum Installation, Upgrades and Live Media
    Replies: 0
    Last Post: 7th December 2008, 01:42 AM
  3. Upgraded from FC5 to FC6, lost pretty login screen
    By phorensic in forum Using Fedora
    Replies: 3
    Last Post: 23rd February 2007, 06:27 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •