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46c98d88-e344-4ed4-8496-4ed7712e255d X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: EQKt2TwFd9I1/gtS+gtXAnehfGuY7OqU5cG9Zl4Q/K6R6t0JAAlBWwb9Nv9u9UjMGuq/5XZ74k1hI5FgYdvQs2aQ3P2o7hzwf9kPVatYlk8= X-MS-Exchange-Transport-CrossTenantHeadersStamped: SJ0PR11MB5919 X-OriginatorOrg: intel.com X-BeenThere: intel-gfx@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Intel graphics driver community testing & development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: intel-gfx-bounces@lists.freedesktop.org Sender: "Intel-gfx" Hello, On 8/6/2026 5:13 PM, nomorsukses@gmail.com 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 >