Page 3 of 5 FirstFirst 12345 LastLast
Results 21 to 30 of 50

Thread: I've lost the ability to change the brightness of my monitor

  1. #21
    Join Date
    May 2008
    Location
    United Kingdom
    Beans
    5,288
    Distro
    Ubuntu

    Re: I've lost the ability to change the brightness of my monitor

    Quote Originally Posted by MAFoElffen View Post
    Here is what I have with that (and I don't even have Dell)…
    Ah… Your first post had underscores instead of hyphens. Mine's the same as yours!

    And I have:
    Code:
    $ lspci -nnnk | grep -A3 -E 'Display|VGA|3D'00:02.0 VGA compatible controller [0300]: Intel Corporation CometLake-S GT2 [UHD Graphics 630] [8086:9bc5] (rev 05)
        DeviceName: Onboard - Video
        Subsystem: Dell CometLake-S GT2 [UHD Graphics 630] [1028:0988]
        Kernel driver in use: i915
    This looks like the same as yours.

    So, as you suggest, this seems to be to do with the Intel GPU rather than with Dell.

    I'll update my bug report, and maybe you can vote for it?
    Always make regular backups of your data (and test them).
    Visit Full Circle Magazine for beginners and seasoned Linux enthusiasts.

  2. #22
    Join Date
    Mar 2010
    Location
    USA
    Beans
    Hidden!
    Distro
    Ubuntu Development Release

    Re: I've lost the ability to change the brightness of my monitor

    I think the problem may be the combination of Intel GPU, source packages 'linux' & 'linux-oem-6.5', kernel series 6.5.0, and kernel module:
    Code:
    /lib/modules/6.5.0-14-generic/kernel/drivers/platform/x86/dell/dell-uart-backlight.ko
    I have that same combination of hardware, although mine is a Gigabyte board. (Not Dell)
    Code:
    mafoelffen@Mikes-B460M:~$ sudo dmidecode -t 1
    # dmidecode 3.3
    Getting SMBIOS data from sysfs.
    SMBIOS 3.2.0 present.
    
    Handle 0x0001, DMI type 1, 27 bytes
    System Information
        Manufacturer: Gigabyte Technology Co., Ltd.
        Product Name: B460M DS3H AC-Y1
        Version: Default string
        Serial Number: Default string
        UUID: 03c00218-044d-053f-4d06-d50700080009
        Wake-up Type: Power Switch
        SKU Number: Default string
        Family: B460 MB
    And in the doc's, yes, it has underscores between the words, but on the machine, in the filesystem, it has hyphons between the word in the module name. I don't know why.
    Last edited by MAFoElffen; January 15th, 2024 at 02:09 PM.

    "Concurrent coexistence of Windows, Linux and UNIX..." || Ubuntu user # 33563, Linux user # 533637
    Sticky: Graphics Resolution | UbuntuForums 'system-info' Script | Posting Guidelines | Code Tags

  3. #23
    Join Date
    Mar 2010
    Location
    USA
    Beans
    Hidden!
    Distro
    Ubuntu Development Release

    Re: I've lost the ability to change the brightness of my monitor

    I inserted that module into my kernel:
    Code:
    mafoelffen@Mikes-B460M:~$ sudo modprobe dell-uart-backlight
    mafoelffen@Mikes-B460M:~$ lsmod | grep dell
    dell_uart_backlight    20480  0
    Notice the difference in the undescores and/or hyphons there?

    I logged out, and back in, to restart the desktop... No backlight brightness control.

    So I do not have a backlight control. I can vote on it if you file it at LaunchPad and post the link... My tip is to include the link I posted to the previous Bug report, saying it is similar, but to that one, but though not crashing, it is resulting in no "Brightness Control".

    *** But now that I know that setting exists, there is a control for it (which I though only exists before on laptops), and that I have similar hardware... I can play around with this and see what is possible.
    Last edited by MAFoElffen; January 15th, 2024 at 02:57 PM.

    "Concurrent coexistence of Windows, Linux and UNIX..." || Ubuntu user # 33563, Linux user # 533637
    Sticky: Graphics Resolution | UbuntuForums 'system-info' Script | Posting Guidelines | Code Tags

  4. #24
    Join Date
    Mar 2010
    Location
    USA
    Beans
    Hidden!
    Distro
    Ubuntu Development Release

    Re: I've lost the ability to change the brightness of my monitor

    Notice how I said, in my last post, where I thought only laptops and notebooks had controllable brightness controls?

    I installed brightnessctl on it to see what was controllable:
    Code:
    mafoelffen@Mikes-B460M:~$ brightnessctl --list
    Available devices:
    Device 'phy0-led' of class 'leds':
        Current brightness: 1 (100%)
        Max brightness: 1
    
    Device 'input5::capslock' of class 'leds':
        Current brightness: 0 (0%)
        Max brightness: 1
    
    Device 'input5::scrolllock' of class 'leds':
        Current brightness: 0 (0%)
        Max brightness: 1
    
    Device 'input5::numlock' of class 'leds':
        Current brightness: 0 (0%)
        Max brightness: 1
    I don't have a brightness controllable display... Hmmm. Let me try a few other things.

    "Concurrent coexistence of Windows, Linux and UNIX..." || Ubuntu user # 33563, Linux user # 533637
    Sticky: Graphics Resolution | UbuntuForums 'system-info' Script | Posting Guidelines | Code Tags

  5. #25
    Join Date
    Mar 2010
    Location
    USA
    Beans
    Hidden!
    Distro
    Ubuntu Development Release

    Re: I've lost the ability to change the brightness of my monitor

    I found a way...
    Code:
    sudo add-apt-repository ppa:apandada1/brightness-controller
    sudo apt update
    sudo apt install --yes brightness-controller
    See attached screenshot. The first slider will control the brightness.
    Attached Images Attached Images
    Last edited by MAFoElffen; January 15th, 2024 at 03:18 PM.

    "Concurrent coexistence of Windows, Linux and UNIX..." || Ubuntu user # 33563, Linux user # 533637
    Sticky: Graphics Resolution | UbuntuForums 'system-info' Script | Posting Guidelines | Code Tags

  6. #26
    Join Date
    Mar 2011
    Location
    U.K.
    Beans
    Hidden!
    Distro
    Ubuntu 22.04 Jammy Jellyfish

    Re: I've lost the ability to change the brightness of my monitor

    Responding to the earlier difficulty (post #15) in using suggested xcalib (although the main issue discussed now seems to be resolved) I think if you search for discussions with "xcalib NEAR gamma" the usage becomes clearer.

    And here is a link I just found to experiment with.

    https://askubuntu.com/questions/9248...tness-contrast

    might fill in some gaps.

  7. #27
    Join Date
    May 2008
    Location
    United Kingdom
    Beans
    5,288
    Distro
    Ubuntu

    Re: I've lost the ability to change the brightness of my monitor

    Quote Originally Posted by MAFoElffen View Post
    Notice the difference in the undescores and/or hyphons there?
    How odd!
    Quote Originally Posted by MAFoElffen View Post
    I can vote on it if you file it at LaunchPad and post the link... My tip is to include the link I posted to the previous Bug report, saying it is similar, but to that one, but though not crashing, it is resulting in no "Brightness Control".
    I have created the bug report here, and mentioned your link and this thread.
    Quote Originally Posted by MAFoElffen View Post
    Notice how I said, in my last post, where I thought only laptops and notebooks had controllable brightness controls?
    Mine is a desktop, and I have had the controls until version kernel 6.5. I was able to also control it through the keypad using custom-assigned keys.
    Quote Originally Posted by MAFoElffen View Post
    I installed brightnessctl on it to see what was controllable:
    I get this:
    Code:
    Device 'input18::numlock' of class 'leds':    Current brightness: 1 (100%)
        Max brightness: 1
    Quote Originally Posted by MAFoElffen View Post
    I found a way... brightness-controller
    Thank you! That works for me.
    Quote Originally Posted by dragonfly41 View Post
    Responding to the earlier difficulty (post #15) in using suggested xcalib…
    Thank you. That seems to talk mainly about Redshift, which I used to use until Ubuntu reverted to GNOME, which has this setting built in. Interestingly, that setting still works on kernel 6.5; it might be software-controlled rather than hardware-controlled.
    Always make regular backups of your data (and test them).
    Visit Full Circle Magazine for beginners and seasoned Linux enthusiasts.

  8. #28
    Join Date
    Mar 2010
    Location
    USA
    Beans
    Hidden!
    Distro
    Ubuntu Development Release

    Re: I've lost the ability to change the brightness of my monitor

    I added a comment on the Bug Report to fill in the gaps.

    "Concurrent coexistence of Windows, Linux and UNIX..." || Ubuntu user # 33563, Linux user # 533637
    Sticky: Graphics Resolution | UbuntuForums 'system-info' Script | Posting Guidelines | Code Tags

  9. #29
    Join Date
    May 2008
    Location
    United Kingdom
    Beans
    5,288
    Distro
    Ubuntu

    Re: I've lost the ability to change the brightness of my monitor

    Quote Originally Posted by MAFoElffen View Post
    I added a comment on the Bug Report to fill in the gaps.
    Excellent, thank you!
    Always make regular backups of your data (and test them).
    Visit Full Circle Magazine for beginners and seasoned Linux enthusiasts.

  10. #30
    Join Date
    Aug 2016
    Location
    Wandering
    Beans
    Hidden!
    Distro
    Xubuntu Development Release

    Re: I've lost the ability to change the brightness of my monitor

    Paddy i had a brain fart on ACPI it is for ASUS only on that tool.
    Code:
    acpitool -A
    Sorry, but no Asus ACPI extensions were found on this system.
    But I knew it was one of those four lettered words....LOL (Dell ASUS)
    With realization of one's own potential and self-confidence in one's ability, one can build a better world.
    Dalai Lama>>
    Code Tags | System-info | Forum Guide lines | Arch Linux, Debian Unstable, FreeBSD

Page 3 of 5 FirstFirst 12345 LastLast

Tags for this Thread

Bookmarks

Posting Permissions

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