Random freezing of the computer during testing.

[Leonardo]

I1m using UBUNTU 20.04

Problem: Occasionally there is a failure to display on the screen with parts alternating colors and characters exchanged in the terminal (only in the terminal). Control characters are displayed on the terminal and "blink" effects occur on some lines.

First symptom: The firefox update made the browser screen (just inside the browser screen) appear many black blocks over the texts and images, corrected with the deactivation of the use of graphical acceleration.

Second symptom: after an update of ubuntu, he started to have a problem in the terminal, with control characters being displayed and a change in the mapping of the keyboard keys BUT this error does not happen in GEdit.

Current symptom: when I open the terminal, the favorite icons on the edge of the screen where the terminal was opened change color alternately. The terminal screen has control characters and changes from character mapping to some keys.
The browser is not fluent in scrolling a web page.

Reboot the computer everything is normal and after a while it happens again.

ProblemType: Bug
DistroRelease: Ubuntu 20.04
Package: xorg 1:7.7+19ubuntu14
ProcVersionSignature: Ubuntu 5.8.0-50.56~20.04.1-generic 5.8.18
Uname: Linux 5.8.0-50-generic x86_64
ApportVersion: 2.20.11-0ubuntu27.16
Architecture: amd64
CasperMD5CheckResult: skip
CompositorRunning: None
Date: Sat Apr 17 22:13:54 2021
DistUpgraded: Fresh install
DistroCodename: focal
DistroVariant: ubuntu
GraphicsCard:
 Intel Corporation 3rd Gen Core processor Graphics Controller [8086:0166] (rev 09) (prog-if 00 [VGA controller])
   Subsystem: ASUSTeK Computer Inc. 3rd Gen Core processor Graphics Controller [1043:100d]
InstallationDate: Installed on 2021-02-23 (53 days ago)
InstallationMedia: Ubuntu 20.04 LTS "Focal Fossa" - Release amd64 (20200423)
MachineType: ASUSTeK COMPUTER INC. K46CA
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-5.8.0-50-generic root=UUID=ec0afab4-cb78-44a3-8868-cf6565dfb058 ro quiet splash vt.handoff=7
SourcePackage: xorg
UpgradeStatus: No upgrade log present (probably fresh install)
dmi.bios.date: 05/17/2013
dmi.bios.release: 4.6
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: K46CA.315
dmi.board.asset.tag: ATN12345678901234567
dmi.board.name: K46CA
dmi.board.vendor: ASUSTeK COMPUTER INC.
dmi.board.version: 1.0
dmi.chassis.asset.tag: No Asset Tag
dmi.chassis.type: 10
dmi.chassis.vendor: ASUSTeK COMPUTER INC.
dmi.chassis.version: 1.0
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvrK46CA.315:bd05/17/2013:br4.6:svnASUSTeKCOMPUTERINC.:pnK46CA:pvr1.0:rvnASUSTeKCOMPUTERINC.:rnK46CA:rvr1.0:cvnASUSTeKCOMPUTERINC.:ct10:cvr1.0:
dmi.product.family: K
dmi.product.name: K46CA
dmi.product.sku: ASUS-NotebookSKU
dmi.product.version: 1.0
dmi.sys.vendor: ASUSTeK COMPUTER INC.
version.compiz: compiz N/A
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 20.2.6-0ubuntu0.20.04.1
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

[Daniel van Vugt (vanvugt)]

Thanks for the bug report. Please try booting into an older kernel version. You can select it in the Grub menu before boot starts by tapping the Escape key.

[Daniel van Vugt (vanvugt)]

If booting an older kernel version does not fix the problem then next please attach photos of the problem.

Although I suspect this is a kernel regression in 5.8.0-50 because I've seen a couple of other similar reports today. Plus your kernel log is showing some graphics errors:

[ 12.084441] i915 0000:00:02.0: [drm] GPU HANG: ecode 7:0:00000000
[ 12.084691] i915 0000:00:02.0: [drm] Resetting chip for stopped heartbeat on rcs0
[ 12.186937] i915 0000:00:02.0: [drm] gnome-shell[838] context reset due to GPU hang
[ 14.901681] i915 0000:00:02.0: [drm] GPU HANG: ecode 7:1:ccddeeff, in gnome-shell [838]
[ 14.901755] i915 0000:00:02.0: [drm] Resetting chip for stopped heartbeat on rcs0
...
[ 30.006257] i915 0000:00:02.0: [drm] GPU HANG: ecode 7:1:ccddeeff, in gnome-shell [1452]
[ 30.006329] i915 0000:00:02.0: [drm] Resetting chip for stopped heartbeat on rcs0
[ 30.108370] i915 0000:00:02.0: [drm] gnome-shell[1452] context reset due to GPU hang
[ 47.677368] i915 0000:00:02.0: [drm] GPU HANG: ecode 7:1:3f5a7c3e, in glmark2 [1836]
[ 47.677437] i915 0000:00:02.0: [drm] Resetting chip for stopped heartbeat on rcs0
[ 47.779415] i915 0000:00:02.0: [drm] glmark2[1836] context reset due to GPU hang
[ 76.803381] i915 0000:00:02.0: [drm] GPU HANG: ecode 7:1:c07fffff, in glmark2 [1836]
[ 76.803441] i915 0000:00:02.0: [drm] Resetting chip for stopped heartbeat on rcs0
[ 76.905854] i915 0000:00:02.0: [drm] glmark2[1836] context reset due to GPU hang

[Daniel van Vugt (vanvugt)]

Thank you for taking the time to report this bug and helping to make Ubuntu better. This particular bug has already been reported and is a duplicate of bug 1924778, so it is being marked as such. Please look at the other bug report to see if there is any missing information that you can provide, or to see if there is a workaround for the bug. Additionally, any further discussion regarding the bug should occur in the other report. Feel free to continue to report any other bugs you may find.

[Leonardo (lvlira)]

I downloaded the Ubuntu 20.04 iso and made a boot running from it. Everything works normal. So I deduced that the problem is in updating third parties, something broke the video driver.
I did a new installation of Ubuntu 20.04 and its updates, installed my tools and lib required for my work.

It's working well so far.

Thank you for your attention and help.