This appears to be a desktop machine so please don't install any brightness controlling software as that's likely to cause more problems than it solves. You should adjust the brightness on the TV itself.
Also please try a different VGA cable if you can. Or at least unplug both ends and plug them in again firmly. ** Package changed: xorg (Ubuntu) => linux-oem-5.14 (Ubuntu) ** Summary changed: - Screen flickering or going black + [i915] Screen flickering or going black ** Summary changed: - [i915] Screen flickering or going black + [i915] TV connected by VGA is flickering or going black -- You received this bug notification because you are a member of Desktop Packages, which is subscribed to xorg in Ubuntu. https://bugs.launchpad.net/bugs/1955632 Title: [i915] TV connected by VGA is flickering or going black Status in linux-oem-5.14 package in Ubuntu: New Bug description: I've been using Ubuntu 20.04 for a long time now and have had no problems. Then suddenly the screen started flickering. I tried PCLinuxOS but the screen just goes black. I found, on Ubuntu, installing brightness-controller and putting the screen brightness down below half way and the setting to Clear Blue Sky helps quite a lot but is hard to see. It still flickers once in awhile. And I cannot create a file in /sys/class/backlight to make the change permanent on boot. The only major change I can think of is setting LivePatch up that could have caused the flickering. Thank you, I hope you find the fix as no Linux distros will work on my ThinkCentre desktop PC. ProblemType: Bug DistroRelease: Ubuntu 20.04 Package: xorg 1:7.7+19ubuntu14 ProcVersionSignature: Ubuntu 5.14.0-1011.11-oem 5.14.17 Uname: Linux 5.14.0-1011-oem x86_64 ApportVersion: 2.20.11-0ubuntu27.21 Architecture: amd64 BootLog: Error: [Errno 13] Permission denied: '/var/log/boot.log' CasperMD5CheckResult: skip CompositorRunning: None CurrentDesktop: ubuntu:GNOME Date: Thu Dec 23 01:52:31 2021 DistUpgraded: Fresh install DistroCodename: focal DistroVariant: ubuntu DkmsStatus: rtl8821CU, 5.4.1, 5.11.0-43-generic, x86_64: installed rtl8821CU, 5.4.1, 5.14.0-1011-oem, x86_64: installed ExtraDebuggingInterest: Yes, if not too technical GraphicsCard: Intel Corporation Xeon E3-1200 v2/3rd Gen Core processor Graphics Controller [8086:0152] (rev 09) (prog-if 00 [VGA controller]) Subsystem: Lenovo Xeon E3-1200 v2/3rd Gen Core processor Graphics Controller [17aa:3083] InstallationDate: Installed on 2021-10-16 (68 days ago) InstallationMedia: Ubuntu 20.04.3 LTS "Focal Fossa" - Release amd64 (20210819) MachineType: LENOVO 3227K45 ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.14.0-1011-oem root=UUID=e7536889-191e-4640-ba6f-6e940cb65228 ro quiet splash vt.handoff=7 SourcePackage: xorg UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 12/11/2018 dmi.bios.release: 0.6 dmi.bios.vendor: LENOVO dmi.bios.version: 9SKT9CAUS dmi.board.asset.tag: 640688 dmi.board.name: MAHOBAY dmi.board.vendor: LENOVO dmi.board.version: 0B98401 PRO dmi.chassis.type: 3 dmi.chassis.vendor: LENOVO dmi.chassis.version: None dmi.modalias: dmi:bvnLENOVO:bvr9SKT9CAUS:bd12/11/2018:br0.6:svnLENOVO:pn3227K45:pvrThinkCentreM92P:rvnLENOVO:rnMAHOBAY:rvr0B98401PRO:cvnLENOVO:ct3:cvrNone:skuLENOVO_MT_3227: dmi.product.family: To be filled by O.E.M. dmi.product.name: 3227K45 dmi.product.sku: LENOVO_MT_3227 dmi.product.version: ThinkCentre M92P dmi.sys.vendor: LENOVO version.compiz: compiz N/A version.libdrm2: libdrm2 2.4.105-3~20.04.2 version.libgl1-mesa-dri: libgl1-mesa-dri 21.0.3-0ubuntu0.3~20.04.5 version.libgl1-mesa-glx: libgl1-mesa-glx N/A version.xserver-xorg-core: xserver-xorg-core 2:1.20.13-1ubuntu1~20.04.2 version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:19.1.0-1 version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917+git20200226-1 version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.16-1 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux-oem-5.14/+bug/1955632/+subscriptions -- Mailing list: https://launchpad.net/~desktop-packages Post to : desktop-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~desktop-packages More help : https://help.launchpad.net/ListHelp
