mouse pointer disappears on tabs/navbar when screen scaled

[fish]

Hi,

running chromium 57.0.2987.98-0ubuntu1.1348 on zesty on a 2016 XPS 13. When using xrandr --scale to make my HiDPI screen usable with my lower DPI screen, moving the mouse over the navbar makes the mouse pointer disappear. I've took a video to demonstrate this: https://www.youtube.com/watch?v=x_YmsFbtcOA

Steps to reproduce:
0. Connect additional, external display
1. run: xrandr --output DP-1 --right-of eDP-1 --output eDP-1 --auto --scale 0.75x0.75
2. hover mouse over navbar

I don't know if this is an issue in chromium or xorg. I filled https://bugs.launchpad.net/ubuntu/+source/xorg-server/+bug/1580123 last year for another issue with scaling. Looks like xorg is pretty much dead. Also happy for any workarounds, chromium is not really usable like this. Fwiw, I'm running xorg 1:7.7+16ubuntu3.

[fish (discordianfish)]

After setting scale to 1x1 and back to 0.75x0.75 just now, my music stopped playing[1] and the screen turned yellow ¯\_(ツ)_/¯:

https://goo.gl/photos/HiVim712e2rpQdZy6

1) Might be unrelated though, using HDMI audio output and screen probably just got disconnected by xorg briefly. Didn't realize this before though.

[fish (discordianfish)]

lspci:

```
00:00.0 Host bridge: Intel Corporation Skylake Host Bridge/DRAM Registers (rev 08)
00:02.0 VGA compatible controller: Intel Corporation HD Graphics 520 (rev 07)
00:04.0 Signal processing controller: Intel Corporation Skylake Processor Thermal Subsystem (rev 08)
00:14.0 USB controller: Intel Corporation Sunrise Point-LP USB 3.0 xHCI Controller (rev 21)
00:14.2 Signal processing controller: Intel Corporation Sunrise Point-LP Thermal subsystem (rev 21)
00:15.0 Signal processing controller: Intel Corporation Sunrise Point-LP Serial IO I2C Controller #0 (rev 21)
00:15.1 Signal processing controller: Intel Corporation Sunrise Point-LP Serial IO I2C Controller #1 (rev 21)
00:16.0 Communication controller: Intel Corporation Sunrise Point-LP CSME HECI #1 (rev 21)
00:1c.0 PCI bridge: Intel Corporation Device 9d10 (rev f1)
00:1c.4 PCI bridge: Intel Corporation Sunrise Point-LP PCI Express Root Port #5 (rev f1)
00:1c.5 PCI bridge: Intel Corporation Sunrise Point-LP PCI Express Root Port #6 (rev f1)
00:1d.0 PCI bridge: Intel Corporation Sunrise Point-LP PCI Express Root Port #9 (rev f1)
00:1f.0 ISA bridge: Intel Corporation Sunrise Point-LP LPC Controller (rev 21)
00:1f.2 Memory controller: Intel Corporation Sunrise Point-LP PMC (rev 21)
00:1f.3 Audio device: Intel Corporation Sunrise Point-LP HD Audio (rev 21)
00:1f.4 SMBus: Intel Corporation Sunrise Point-LP SMBus (rev 21)
01:00.0 PCI bridge: Intel Corporation DSL6340 Thunderbolt 3 Bridge [Alpine Ridge 2C 2015]
02:00.0 PCI bridge: Intel Corporation DSL6340 Thunderbolt 3 Bridge [Alpine Ridge 2C 2015]
02:01.0 PCI bridge: Intel Corporation DSL6340 Thunderbolt 3 Bridge [Alpine Ridge 2C 2015]
02:02.0 PCI bridge: Intel Corporation DSL6340 Thunderbolt 3 Bridge [Alpine Ridge 2C 2015]
39:00.0 USB controller: Intel Corporation DSL6340 USB 3.1 Controller [Alpine Ridge]
3a:00.0 Network controller: Broadcom Limited BCM4350 802.11ac Wireless Network Adapter (rev 08)
3b:00.0 Unassigned class [ff00]: Realtek Semiconductor Co., Ltd. RTS525A PCI Express Card Reader (rev 01)
3c:00.0 Non-Volatile memory controller: Samsung Electronics Co Ltd NVMe SSD Controller SM951/PM951 (rev 01)
```

[Paul White (paulw2u)]

Is this still an issue now that Chromium 71.0 is the currently supported version?

[fish (discordianfish)]

Yes, that's still the case.

[Nathan Teodosio (nteodosio)]

Is this still an issue now that Chromium 106.0 is the currently supported version?

[Launchpad Janitor (janitor)]

[Expired for chromium-browser (Ubuntu) because there has been no activity for 60 days.]