Public bug reported: So last night (April 13th), I installed an update from Canonical that popped up in a GUI, it said something about a security update (I didn't look at it too hard). Since then I've rebooted my machine and now the display is the wrong resolution (it ought to be 3840 x 2160, 597mm x 336mm, 60fps [monitor](https://www.lg.com/us/monitors/lg-27UD58-B-4k- uhd-led-monitor)). I'm presently on Ubuntu 20.04.2 LTS.
``` $ xrandr xrandr: Failed to get size of gamma for output default Screen 0: minimum 1024 x 768, current 1024 x 768, maximum 1024 x 768 default connected primary 1024x768+0+0 0mm x 0mm 1024x768 76.00* ``` ``` $ inxi -G Graphics: Device-1: NVIDIA GM107GL [Quadro K2200] driver: N/A Display: x11 server: X.Org 1.20.9 driver: fbdev,nouveau unloaded: modesetting,vesa resolution: 1024x768~76Hz OpenGL: renderer: llvmpipe (LLVM 11.0.0 256 bits) v: 4.5 Mesa 20.2.6 ``` I've tried unplugging and replugging the monitor, rebooting several times, adding an xrandr modeline, and changing `/etc/default/grub` to have `GRUB_CMDLINE_LINUX_DEFAULT="quiet splash i915.alpha_support=1"` (where it was `"quiet splash"` before). None of these have led to any success. My feeling is that there's some graphics driver issue (that the renderer is llvmpipe doesn't seem right). I guess there's also a confounding factor in that I'm running the display through a [KVM switch](https://www.tripplite.com/2-port- displayport-usb-kvm-switch-4k-60-hz-hdr%7EB005DPUA4), but I really hope that's not the problem. I've been using it for a while anyway with no issue, the Windows 10 partition of this machine renders fine, and I have another machine running 18.04 that gets the resolution just fine. I tried booting into recovery mode, which was no dice (also tried cleaning up `dpkg` through the recovery interface). While I was in the GRUB menu, I noticed that it defaults to the kernel version 5.8.0-49, but that I also had 5.8.0-48 installed. Boothing into the older kernel, everything worked. Curious, I checked the logs. ``` $ cat /var/log/dpkg.log | grep linux-image 2021-04-13 23:15:01 install linux-image-5.8.0-49-generic:amd64 <none> 5.8.0-49.55~20.04.1 ``` And that lines up with when I did that update. So it seems that the new kernel version somehow made it so xrandr couldn't detect any of the modes on my monitor and just defaulted to some default. So the workaround presently is just boot with 5.8.0-48. ProblemType: Bug DistroRelease: Ubuntu 20.04 Package: xorg 1:7.7+19ubuntu14 ProcVersionSignature: Ubuntu 5.8.0-49.55~20.04.1-generic 5.8.18 Uname: Linux 5.8.0-49-generic x86_64 .tmp.unity_support_test.1: ApportVersion: 2.20.11-0ubuntu27.16 Architecture: amd64 BootLog: Error: [Errno 13] Permission denied: '/var/log/boot.log' CasperMD5CheckResult: skip CompositorRunning: None CurrentDesktop: ubuntu:GNOME Date: Wed Apr 14 17:21:08 2021 DistUpgraded: Fresh install DistroCodename: focal DistroVariant: ubuntu ExtraDebuggingInterest: Yes, including running git bisection searches GraphicsCard: NVIDIA Corporation GM107GL [Quadro K2200] [10de:13ba] (rev a2) (prog-if 00 [VGA controller]) Subsystem: NVIDIA Corporation GM107GL [Quadro K2200] [10de:1097] InstallationDate: Installed on 2021-02-15 (58 days ago) InstallationMedia: Ubuntu 20.04.2.0 LTS "Focal Fossa" - Release amd64 (20210209.1) MachineType: Gigabyte Technology Co., Ltd. X570 AORUS ELITE WIFI ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.8.0-49-generic root=UUID=babb99d2-0867-4673-b5ec-2cce0643eaa2 ro quiet splash i915.alpha_support=1 vt.handoff=7 SourcePackage: xorg Symptom: display UpgradeStatus: No upgrade log present (probably fresh install) dmi.bios.date: 09/15/2020 dmi.bios.release: 5.17 dmi.bios.vendor: American Megatrends Inc. dmi.bios.version: F30 dmi.board.asset.tag: Default string dmi.board.name: X570 AORUS ELITE WIFI dmi.board.vendor: Gigabyte Technology Co., Ltd. dmi.board.version: x.x dmi.chassis.asset.tag: Default string dmi.chassis.type: 3 dmi.chassis.vendor: Default string dmi.chassis.version: Default string dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrF30:bd09/15/2020:br5.17:svnGigabyteTechnologyCo.,Ltd.:pnX570AORUSELITEWIFI:pvr-CF:rvnGigabyteTechnologyCo.,Ltd.:rnX570AORUSELITEWIFI:rvrx.x:cvnDefaultstring:ct3:cvrDefaultstring: dmi.product.family: X570 MB dmi.product.name: X570 AORUS ELITE WIFI dmi.product.sku: Default string dmi.product.version: -CF dmi.sys.vendor: Gigabyte Technology Co., Ltd. version.compiz: compiz 1:0.9.14.1+20.04.20200211-0ubuntu1 version.libdrm2: libdrm2 2.4.102-1ubuntu1~20.04.1 version.libgl1-mesa-dri: libgl1-mesa-dri 20.2.6-0ubuntu0.20.04.1 version.libgl1-mesa-glx: libgl1-mesa-glx N/A version.xserver-xorg-core: xserver-xorg-core 2:1.20.9-2ubuntu1.2~20.04.2 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 ** Affects: xorg (Ubuntu) Importance: Undecided Status: New ** Tags: amd64 apport-bug focal possible-manual-nvidia-install resolution 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/1924190 Title: Display is wrong resolution, aspect ratio, and size To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/xorg/+bug/1924190/+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
