Public bug reported: Hello guys!
The brightness of the screen on my laptop (Dell 7573 with touch ips 1080 panel) slightly changes randomly when using the laptop builtin display. It feels the same as I changed the brightness one step using the keyboard keys. Here is a video: https://drive.google.com/file/d/1XQLXKLWu2TlOoGP-p8eaUGZR78713ErH/view?usp=sharing I suffer with this problem since a long time ago. I think since ubuntu 19. I tried everything you can imagine, I will make a list of things I've tried. I had gave up trying to fix this already but in a beautiful sunny day suddenly the bug stopped happening. So I decided to report this bug now because this bug does NOT happen with only this version of the kernel: Linux 5.11.0-16-generic. So that can probably e useful to help discovering the bug reason. I am choosing this version on grub every time I reboot so the bug doesn't happen. If I boot on 5.11.0-25 the bug is back. List of things I've tried: - Changing i915 parameters like enable_psr to false and many others. - Upgrading BIOS version. - Installing windows and applying all the patches on dell's website and installing ubuntu again. - Disabling "dynamic backlight control" on BIOS. Some maybe useful info: - I've tried other distros like Fedora and PopOS and the same bug happens. - The bug does not happen when using live ubuntu from usb. - When you fresh install ubuntu (I've tried with 20.04, 20.10 and 21.04) the bug doesn't happen when you have just installed the os but it starts again after the first update. The same applies to the other distro's mentioned above. - When you disable i915 driver with modeset parameter, it does not happen. - The bug does NOT happen only with this kernel version 5.11.0-16-generic, BUT it starts happening again if I lock screen and login again. So I am never locking my screen and holding this kernel version for now. Thanks guys! ProblemType: Bug DistroRelease: Ubuntu 21.04 Package: xorg 1:7.7+22ubuntu1 ProcVersionSignature: Ubuntu 5.11.0-16.17-generic 5.11.12 Uname: Linux 5.11.0-16-generic x86_64 ApportVersion: 2.20.11-0ubuntu65.1 Architecture: amd64 BootLog: Error: [Errno 13] Permission denied: '/var/log/boot.log' CasperMD5CheckResult: pass CompositorRunning: None CurrentDesktop: ubuntu:GNOME Date: Thu Jul 29 20:54:14 2021 DistUpgraded: Fresh install DistroCodename: hirsute DistroVariant: ubuntu DkmsStatus: virtualbox, 6.1.18, 5.11.0-16-generic, x86_64: installed virtualbox, 6.1.18, 5.11.0-25-generic, x86_64: installed ExtraDebuggingInterest: Yes GraphicsCard: Intel Corporation UHD Graphics 620 [8086:5917] (rev 07) (prog-if 00 [VGA controller]) Subsystem: Dell UHD Graphics 620 [1028:07ec] InstallationDate: Installed on 2021-07-25 (4 days ago) InstallationMedia: Ubuntu 21.04 "Hirsute Hippo" - Release amd64 (20210420) MachineType: Dell Inc. Inspiron 7573 ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.11.0-16-generic root=UUID=663d1a67-7acb-428f-a6c8-a9a259a5427c ro quiet splash vt.handoff=7 SourcePackage: xorg Symptom: display UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 05/06/2021 dmi.bios.release: 1.18 dmi.bios.vendor: Dell Inc. dmi.bios.version: 1.18.1 dmi.board.name: 023FRC dmi.board.vendor: Dell Inc. dmi.board.version: A00 dmi.chassis.type: 31 dmi.chassis.vendor: Dell Inc. dmi.modalias: dmi:bvnDellInc.:bvr1.18.1:bd05/06/2021:br1.18:svnDellInc.:pnInspiron7573:pvr:rvnDellInc.:rn023FRC:rvrA00:cvnDellInc.:ct31:cvr: dmi.product.family: Inspiron dmi.product.name: Inspiron 7573 dmi.product.sku: 07EC dmi.sys.vendor: Dell Inc. version.compiz: compiz N/A version.libdrm2: libdrm2 2.4.105-3~21.04.1 version.libgl1-mesa-dri: libgl1-mesa-dri 21.0.1-2 version.libgl1-mesa-glx: libgl1-mesa-glx N/A version.xserver-xorg-core: xserver-xorg-core 2:1.20.11-1ubuntu1.1 version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:19.1.0-2 version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917+git20200714-1ubuntu1 version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.17-1 ** Affects: xorg (Ubuntu) Importance: Undecided Status: New ** Tags: amd64 apport-bug hirsute ubuntu -- You received this bug notification because you are a member of Ubuntu-X, which is subscribed to xorg in Ubuntu. https://bugs.launchpad.net/bugs/1938477 Title: Screen brightness changing randomly To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1938477/+subscriptions _______________________________________________ Mailing list: https://launchpad.net/~ubuntu-x-swat Post to : ubuntu-x-swat@lists.launchpad.net Unsubscribe : https://launchpad.net/~ubuntu-x-swat More help : https://help.launchpad.net/ListHelp
