Ok, can confirm after having disabled Gnome's 'screen lock' entirely,
that this is triggered merely by the 'Screen blanking' being invoked.
For now will workaround by disabling that, but in case it's useful
here's the dmesg output from when this happened just now when the screen
blanked. Leaving out the remaining call stack as it's no different from
previously.
```
[Sun Sep 1 22:11:08 2024] audit: type=1400 audit(1725225069.215:107):
apparmor="DENIED" operation="capable" class="cap"
profile="/usr/lib/snapd/snap-confine" pid=8136 comm="snap-confine"
capability=12 capname="net_admin"
[Sun Sep 1 22:11:08 2024] audit: type=1400 audit(1725225069.215:108):
apparmor="DENIED" operation="capable" class="cap"
profile="/usr/lib/snapd/snap-confine" pid=8136 comm="snap-confine"
capability=38 capname="perfmon"
[Sun Sep 1 22:19:09 2024] simple-framebuffer simple-framebuffer.0: swiotlb
buffer is full (sz: 1802240 bytes), total 32768 (slots), used 86 (slots)
[Sun Sep 1 22:19:09 2024] simple-framebuffer simple-framebuffer.0: swiotlb
buffer is full (sz: 1802240 bytes), total 32768 (slots), used 86 (slots)
[Sun Sep 1 22:19:10 2024] simple-framebuffer simple-framebuffer.0: swiotlb
buffer is full (sz: 2068480 bytes), total 32768 (slots), used 12 (slots)
[Sun Sep 1 22:19:12 2024] usb 1-3.2: USB disconnect, device number 5
[Sun Sep 1 22:19:15 2024] simple-framebuffer simple-framebuffer.0: swiotlb
buffer is full (sz: 442368 bytes), total 32768 (slots), used 6096 (slots)
[Sun Sep 1 22:19:15 2024] ------------[ cut here ]------------
[Sun Sep 1 22:19:15 2024] simple-framebuffer simple-framebuffer.0:
drm_WARN_ON(map->is_iomem)
[Sun Sep 1 22:19:15 2024] WARNING: CPU: 9 PID: 2746 at
drivers/gpu/drm/drm_gem_shmem_helper.c:319 drm_gem_shmem_vmap+0x1a5/0x1e0
[Sun Sep 1 22:19:15 2024] Modules linked in: veth xt_MASQUERADE
nf_conntrack_netlink xfrm_user xfrm_algo xt_addrtype br_netfilter nft_chain_nat
xt_nat nf_nat nfnetlink_queue xt_commen>
[Sun Sep 1 22:19:15 2024] btusb ac97_bus videobuf2_memops snd_pcm_dmaengine
videobuf2_v4l2 btrtl snd_usb_audio kvm_intel snd_hda_intel btintel videodev
btbcm snd_intel_dspcfg btmtk s>
[Sun Sep 1 22:19:15 2024] hid_logitech_dj hid_generic cdc_ncm usbhid
cdc_ether usbnet hid mii nvme crc32_pclmul r8169 nvme_core i2c_i801
spi_intel_pci intel_lpss_pci ahci xhci_pci sp>
[Sun Sep 1 22:19:15 2024] CPU: 9 PID: 2746 Comm: Xorg Tainted: P OE
6.8.0-40-generic #40~22.04.3-Ubuntu
[Sun Sep 1 22:19:15 2024] Hardware name: Gigabyte Technology Co., Ltd. B760M
DS3H DDR4/B760M DS3H DDR4, BIOS F17 05/08/2024
[Sun Sep 1 22:19:15 2024] RIP: 0010:drm_gem_shmem_vmap+0x1a5/0x1e0
[Sun Sep 1 22:19:15 2024] Code: 4c 8b 6f 50 4d 85 ed 75 03 4c 8b 2f e8 c4 a3
ec ff 48 c7 c1 39 19 09 a5 4c 89 ea 48 c7 c7 17 9b 08 a5 48 89 c6 e8 ab 34 46
ff <0f> 0b 48 8b 83 f0 00 00>
[Sun Sep 1 22:19:15 2024] RSP: 0018:ffffbfb243e2b940 EFLAGS: 00010246
[Sun Sep 1 22:19:15 2024] RAX: 0000000000000000 RBX: ffff9f9b84897000 RCX:
0000000000000000
[Sun Sep 1 22:19:15 2024] RDX: 0000000000000000 RSI: 0000000000000000 RDI:
0000000000000000
[Sun Sep 1 22:19:15 2024] RBP: ffffbfb243e2b960 R08: 0000000000000000 R09:
0000000000000000
[Sun Sep 1 22:19:15 2024] R10: 0000000000000000 R11: 0000000000000000 R12:
ffff9f9dfa6634c8
[Sun Sep 1 22:19:15 2024] R13: ffff9f9b829c6e20 R14: ffff9f9dfa6634c8 R15:
ffff9f9dfa6634c8
[Sun Sep 1 22:19:15 2024] FS: 00007a451114ea80(0000)
GS:ffff9faaff880000(0000) knlGS:0000000000000000
[Sun Sep 1 22:19:15 2024] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
[Sun Sep 1 22:19:15 2024] CR2: 00005d8582fb9e1c CR3: 000000010ad88000 CR4:
0000000000f50ef0
[Sun Sep 1 22:19:15 2024] PKRU: 55555554
[Sun Sep 1 22:19:15 2024] Call Trace:
[Sun Sep 1 22:19:15 2024] <TASK>
[Sun Sep 1 22:19:15 2024] ? show_regs+0x6d/0x80
[Sun Sep 1 22:19:15 2024] ? __warn+0x89/0x160
```
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Crash
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