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#1 2021-02-22 15:29:29

CountZukula
Member
Registered: 2017-11-04
Posts: 43

Flickering (terminal+X): HP Zbook Create G7

Trouble never comes alone, they say. I'm seeing a weird flicker on this Zbook, which is hard to describe properly as it's happening pretty fast (single frame, maybe a couple).

- it appears as if the whole content is drawn in the top half of the screen
- sometimes two flickers happen seconds apart, sometimes minutes apart
- Windows does not exhibit issues: I have disabled the GPU to see if that had any effect but haven't seen flickering so far
- flickering happens in terminal (harder to see as there's less content) and X
- saw flickers with both Nouveau and Nvidia

Any ideas or tips?

lspci -nn

00:00.0 Host bridge [0600]: Intel Corporation 10th Gen Core Processor Host Bridge/DRAM Registers [8086:9b44] (rev 02)
00:01.0 PCI bridge [0604]: Intel Corporation 6th-9th Gen Core Processor PCIe Controller (x16) [8086:1901] (rev 02)
00:02.0 VGA compatible controller [0300]: Intel Corporation UHD Graphics [8086:9bc4] (rev 05)
00:04.0 Signal processing controller [1180]: Intel Corporation Xeon E3-1200 v5/E3-1500 v5/6th Gen Core Processor Thermal Subsystem [8086:1903] (rev 02)
00:12.0 Signal processing controller [1180]: Intel Corporation Comet Lake PCH Thermal Controller [8086:06f9]
00:14.0 USB controller [0c03]: Intel Corporation Comet Lake USB 3.1 xHCI Host Controller [8086:06ed]
00:14.2 RAM memory [0500]: Intel Corporation Comet Lake PCH Shared SRAM [8086:06ef]
00:14.3 Network controller [0280]: Intel Corporation Comet Lake PCH CNVi WiFi [8086:06f0]
00:15.0 Serial bus controller [0c80]: Intel Corporation Comet Lake PCH Serial IO I2C Controller #0 [8086:06e8]
00:15.1 Serial bus controller [0c80]: Intel Corporation Comet Lake PCH Serial IO I2C Controller #1 [8086:06e9]
00:16.0 Communication controller [0780]: Intel Corporation Comet Lake HECI Controller [8086:06e0]
00:16.3 Serial controller [0700]: Intel Corporation Device [8086:06e3]
00:1c.0 PCI bridge [0604]: Intel Corporation Device [8086:06ba] (rev f0)
00:1c.4 PCI bridge [0604]: Intel Corporation Device [8086:06bc] (rev f0)
00:1d.0 PCI bridge [0604]: Intel Corporation Comet Lake PCI Express Root Port #9 [8086:06b0] (rev f0)
00:1f.0 ISA bridge [0601]: Intel Corporation Device [8086:068e]
00:1f.3 Multimedia audio controller [0401]: Intel Corporation Comet Lake PCH cAVS [8086:06c8]
00:1f.4 SMBus [0c05]: Intel Corporation Comet Lake PCH SMBus Controller [8086:06a3]
00:1f.5 Serial bus controller [0c80]: Intel Corporation Comet Lake PCH SPI Controller [8086:06a4]
01:00.0 VGA compatible controller [0300]: NVIDIA Corporation TU106M [GeForce RTX 2070 Mobile / Max-Q Refresh] [10de:1f14] (rev a1)
01:00.1 Audio device [0403]: NVIDIA Corporation TU106 High Definition Audio Controller [10de:10f9] (rev a1)
01:00.2 USB controller [0c03]: NVIDIA Corporation TU106 USB 3.1 Host Controller [10de:1ada] (rev a1)
01:00.3 Serial bus controller [0c80]: NVIDIA Corporation TU106 USB Type-C UCSI Controller [10de:1adb] (rev a1)
02:00.0 Unassigned class [ff00]: Realtek Semiconductor Co., Ltd. RTS525A PCI Express Card Reader [10ec:525a] (rev 01)
03:00.0 PCI bridge [0604]: Intel Corporation JHL7540 Thunderbolt 3 Bridge [Titan Ridge 4C 2018] [8086:15ea] (rev 06)
04:00.0 PCI bridge [0604]: Intel Corporation JHL7540 Thunderbolt 3 Bridge [Titan Ridge 4C 2018] [8086:15ea] (rev 06)
04:01.0 PCI bridge [0604]: Intel Corporation JHL7540 Thunderbolt 3 Bridge [Titan Ridge 4C 2018] [8086:15ea] (rev 06)
04:02.0 PCI bridge [0604]: Intel Corporation JHL7540 Thunderbolt 3 Bridge [Titan Ridge 4C 2018] [8086:15ea] (rev 06)
04:04.0 PCI bridge [0604]: Intel Corporation JHL7540 Thunderbolt 3 Bridge [Titan Ridge 4C 2018] [8086:15ea] (rev 06)
05:00.0 System peripheral [0880]: Intel Corporation JHL7540 Thunderbolt 3 NHI [Titan Ridge 4C 2018] [8086:15eb] (rev 06)
39:00.0 USB controller [0c03]: Intel Corporation JHL7540 Thunderbolt 3 USB Controller [Titan Ridge 4C 2018] [8086:15ec] (rev 06)
6d:00.0 Non-Volatile memory controller [0108]: Micron Technology Inc Device [1344:5405]

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#2 2021-02-23 15:16:39

CountZukula
Member
Registered: 2017-11-04
Posts: 43

Re: Flickering (terminal+X): HP Zbook Create G7

A small update, perhaps this rings a bell to anyone.

I have tried setting i915.enable_psr=0, to no avail. This results in my screen being drawn in the top half, with the bottom half washed out white (as described here: https://wiki.archlinux.org/index.php/in … flickering, screenshot below). Perhaps related to the fact that I'm seeing the flicker happen in the top half?

Something else I have seen is that, upon opening, firefox did not render its bottom half of the window. Instead, the vertical scrollbar of the website was drawn in the top half of the screen. The bottom half of the firefox window was completely blank. As if the screen compositor / X (?) only got half of the available height reported? Shamefully, I did not screen capture that situation, and I'm not sure I'll be able to see it again.

Tried setting kernel loglevel=7 / no quiet, but there is no log output during a flicker (in dmesg / journalctl / Xorg.log).

https://i.imgur.com/bucJERg.jpg

Mod edit:  Replaced oversized image with a link -- V1del

Last edited by V1del (2021-02-23 15:35:23)

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#3 2021-02-23 15:38:03

V1del
Forum Moderator
Registered: 2012-10-16
Posts: 12,211

Re: Flickering (terminal+X): HP Zbook Create G7

Please don't embed huge images directly. Try enabling early KMS for i915: https://wiki.archlinux.org/index.php/Ke … _KMS_start

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#4 2021-02-23 20:08:03

CountZukula
Member
Registered: 2017-11-04
Posts: 43

Re: Flickering (terminal+X): HP Zbook Create G7

Added MODULES=(i915) to /etc/mkinitcpio.conf, then ran mkinitcpio -P, then rebooted. Didn't help, still seeing the flickers. I checked whether intel_gpa was loaded beforehand, which is not the case in my system.

For what it's worth, I tried to verify that the issue I'm seeing is how I'm describing it (https://drive.google.com/file/d/1UujbsT … sp=sharing). There's one instance of the flicker present in this video, where it's clear (if you squint and replay the specific second a couple of times) the whole content is drawn on the top 1/3 of the screen (squashed vertically).

Small update: I have tested Ubuntu and I'm seeing the same behaviour there (i915/nouveau). BIOS is updated.

Last edited by CountZukula (2021-02-24 12:42:31)

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