Re: [REGRESSION] Dell Latitude 7390 Intel UHD 620 screen becomes extremely dim after kernel 7.x upgrade

Hello,

On 8/6/2026 5:13 PM, [email protected] wrote:
> Hello Linux kernel and Intel graphics developers,
> 
> I would like to report a kernel regression affecting the internal 
> display brightness on my Dell Latitude 7390 laptop.
> 
> After upgrading from Linux kernel 6.14.x to Linux kernel 7.x, the 
> internal laptop display becomes extremely dim immediately after boot.
> 
> The system continues to run normally, but the brightness level becomes 
> almost unusable.
> 
> Booting back into Linux kernel 6.14.x restores normal display brightness.
> 

Thank you for the report.

Can you please file a bug using [1]?

==
Chaitanya

[1] https://drm.pages.freedesktop.org/intel-docs/how-to-file-i915-bugs.html

> Hardware information:
> 
> Laptop:
> Dell Latitude 7390
> 
> CPU:
> Intel Core i7-8650U
> 
> GPU:
> Intel UHD Graphics 620
> PCI ID: 8086:5917
> 
> Graphics driver:
> i915
> 
> Display:
> Chi Mei Innolux 1920x1080 eDP panel
> 
> BIOS:
> Dell version 1.44.0
> 
> Operating systems tested:
> 
>   *
> 
>     Ubuntu 24.04.4 LTS
> 
>   *
> 
>     Linux Mint 22.2 (based on Ubuntu 24.04)
> 
> The same issue happens on both distributions.
> 
> Working kernel:
> 6.14.0-29-generic
> 
> Problematic kernel:
> 7.x
> 
> Steps to reproduce:
> 
>  1.
> 
>     Install Ubuntu 24.04 or Linux Mint 22.2.
> 
>  2.
> 
>     Update the system to kernel 7.x.
> 
>  3.
> 
>     Reboot.
> 
>  4.
> 
>     The internal display becomes extremely dim.
> 
>  5.
> 
>     Boot kernel 6.14.x.
> 
>  6.
> 
>     Display brightness works normally again.
> 
> Additional information:
> 
>   *
> 
>     Secure Boot is disabled.
> 
>   *
> 
>     The issue is reproducible.
> 
>   *
> 
>     The system remains usable except for the display brightness problem.
> 
>   *
> 
>     The regression appears between kernel 6.14 and kernel 7.x.
> 
>   *
> 
>     The graphics driver in use is Intel i915.
> 
> This may be related to Intel i915 backlight handling or eDP panel 
> initialization.
> 
> I can provide dmesg logs and additional debugging information if required.
> 
> Thank you for your help.
> 
> Best regards,
> PoL
>