Package: src:linux
Version: 6.12.38-1
Control: affects -1 gnome gnome-control-center nvidia-driver

The machine on which the bug occurs is a desktop PC with a graphic card NVIDIA 
PΛLiΤ GeForce GTX 1660 in a PCIe slot (to which a monitor is connected via DVI 
output) and a chip ASPEED AST2500 64MB on the motherboard (this chip provide 
VGA output, but no monitor is connected to the VGA socket). I run gnome 1:48+2 
with libmutter-16-0 48.4-2 on xorg 1:7.7+24 in Debian trixie. The proprietary 
nvidia-driver 550.163.01-2 is in use.

When trying to move the mouse cursor to the right beyond the right border of 
the screen, the cursor vanishes. Moving the mouse to the left makes the cursor 
reappear again.  The more you move the mouse to the right initially, the more 
movement to the left it takes later for the cursor to reappear.  Using a window 
menu, I can also move windows (say, an xterm window) to the right until they 
fully disappear (only if the cursor is high enough).  This behavior is 
consistent with the GUI assuming that there is a second, “ghost” monitor with a 
smaller resolution to the right of the main monitor.  In reality, there is no 
second monitor.  Looking into `gnome-control-center display`, I find partial 
traces of “thinking” that there would be a second monitor: an “Unbekannte 
Anzeige” (German for “Unknown monitor”) is seen, the switch of which is turned 
off but which has a resolution attached to it.

I tried to debug via command line a bit:

$ sudo xrandr --listproviders
Providers: number : 2
Provider 0: id: 0x1b7 cap: 0x1, Source Output crtcs: 4 outputs: 4 associated 
providers: 1 name:NVIDIA-0
Provider 1: id: 0x1ed cap: 0x2, Sink Output crtcs: 1 outputs: 1 associated 
providers: 1 name:modesetting
$ xrandr --listmonitors
Monitors: 1
 0: +*DVI-D-0 1920/531x1080/298+0+0  DVI-D-0
$ xrandr
Screen 0: minimum 8 x 8, current 2944 x 1080, maximum 32767 x 32767
DVI-D-0 connected primary 1920x1080+0+0 (normal left inverted right x axis y 
axis) 531mm x 298mm
   1920x1080     60.00*+
   1680x1050     59.95
   1600x900      60.00
   1280x1024     75.02    60.02
   1280x800      59.81
   1280x720      60.00
   1024x768      75.03    60.00
   800x600       75.00    60.32
   640x480       75.00    59.94
HDMI-0 disconnected (normal left inverted right x axis y axis)
DP-0 disconnected (normal left inverted right x axis y axis)
DP-1 disconnected (normal left inverted right x axis y axis)
VGA-1-1 connected (normal left inverted right x axis y axis)
   1024x768      60.00 +
   1920x1200     59.88    59.95
   1920x1080     60.00
   1600x1200     60.00
   1680x1050     59.95    59.88
   1600x900      60.00
   1280x1024     60.02
   1440x900      59.89    59.90
   1360x768      60.02
   1280x800      59.81    59.91
   800x600       60.32    56.25
   640x480       59.94
  1024x768 (0x1c5) 65.000MHz -HSync -VSync
        h: width  1024 start 1048 end 1184 total 1344 skew    0 clock  48.36KHz
        v: height  768 start  771 end  777 total  806           clock  60.00Hz
  1680x1050 (0x1be) 146.250MHz -HSync +VSync
        h: width  1680 start 1784 end 1960 total 2240 skew    0 clock  65.29KHz
        v: height 1050 start 1053 end 1059 total 1089           clock  59.95Hz
  1600x900 (0x1bf) 108.000MHz +HSync +VSync
        h: width  1600 start 1624 end 1704 total 1800 skew    0 clock  60.00KHz
        v: height  900 start  901 end  904 total 1000           clock  60.00Hz
  1280x1024 (0x1c1) 108.000MHz +HSync +VSync
        h: width  1280 start 1328 end 1440 total 1688 skew    0 clock  63.98KHz
        v: height 1024 start 1025 end 1028 total 1066           clock  60.02Hz
  1280x800 (0x1c2) 83.500MHz -HSync +VSync
        h: width  1280 start 1352 end 1480 total 1680 skew    0 clock  49.70KHz
        v: height  800 start  803 end  809 total  831           clock  59.81Hz
  800x600 (0x1c7) 40.000MHz +HSync +VSync
        h: width   800 start  840 end  968 total 1056 skew    0 clock  37.88KHz
        v: height  600 start  601 end  605 total  628           clock  60.32Hz
  640x480 (0x1c9) 25.175MHz -HSync -VSync
        h: width   640 start  656 end  752 total  800 skew    0 clock  31.47KHz
        v: height  480 start  490 end  492 total  525           clock  59.94Hz
$ cat ~/.config/monitors.xml
<monitors version="2">
  <configuration>
    <layoutmode>logical</layoutmode>
    <logicalmonitor>
      <x>0</x>
      <y>0</y>
      <scale>1</scale>
      <primary>yes</primary>
      <monitor>
        <monitorspec>
          <connector>DVI-D-1</connector>
          <vendor>BNQ</vendor>
          <product>BenQ G2450</product>
          <serial>AnonymizedSerialNumber</serial>
        </monitorspec>
        <mode>
          <width>1920</width>
          <height>1080</height>
          <rate>60.000</rate>
        </mode>
      </monitor>
    </logicalmonitor>
    <disabled>
      <monitorspec>
        <connector>VGA-1</connector>
        <vendor>unknown</vendor>
        <product>unknown</product>
        <serial>unknown</serial>
      </monitorspec>
    </disabled>
  </configuration>
  <configuration>
    <layoutmode>physical</layoutmode>
    <logicalmonitor>
      <x>0</x>
      <y>0</y>
      <scale>1</scale>
      <primary>yes</primary>
      <monitor>
        <monitorspec>
          <connector>DVI-D-1</connector>
          <vendor>BNQ</vendor>
          <product>BenQ G2450</product>
          <serial>AnonymizedSerialNumber</serial>
        </monitorspec>
        <mode>
          <width>1920</width>
          <height>1080</height>
          <rate>60.000</rate>
        </mode>
      </monitor>
    </logicalmonitor>
    <disabled>
      <monitorspec>
        <connector>VGA-1</connector>
        <vendor>unknown</vendor>
        <product>unknown</product>
        <serial>unknown</serial>
      </monitorspec>
    </disabled>
  </configuration>
</monitors>



In the log, I found some call traces connected to ast:


Aug 12 22:32:38 AnonymPC kernel: ------------[ cut here ]------------
Aug 12 22:32:38 AnonymPC kernel: ast 0000:04:00.0: [drm] 
drm_WARN_ON(map->is_iomem)
Aug 12 22:32:38 AnonymPC kernel: WARNING: CPU: 3 PID: 1709 at 
drivers/gpu/drm/drm_gem_shmem_helper.c:322 drm_gem_shmem_vmap+0x173/0x1b0 
[drm_shmem_helper]
Aug 12 22:32:38 AnonymPC kernel: Modules linked in: ccm snd_seq_dummy 
snd_hrtimer snd_seq snd_seq_device qrtr uinput nvidia_drm(PO) si2157 si2168 
m88rs6000t drm_ttm_helper a8293 ttm nvidia_modeset(PO) intel_rapl_msr 
intel_rapl_common intel_uncore_frequency intel_uncore_frequency_common cx25840 
skx_edac skx_edac_common nfit libnvdimm x86_pkg_temp_thermal cx23885 
intel_powerclamp snd_soc_avs altera_ci coretemp snd_soc_hda_codec tda18271 
kvm_intel snd_hda_ext_core altera_stapl snd_soc_core snd_hda_codec_realtek 
m88ds3103 kvm snd_hda_codec_generic snd_compress i2c_mux cx2341x 
snd_hda_scodec_component snd_hda_codec_hdmi snd_pcm_dmaengine irqbypass 
tveeprom nvidia(PO) crct10dif_pclmul videobuf2_dvb ghash_clmulni_intel dvb_core 
sha512_ssse3 videobuf2_dma_sg snd_hda_intel sha256_ssse3 binfmt_misc 
videobuf2_memops snd_intel_dspcfg sha1_ssse3 videobuf2_v4l2 iwlmvm 
snd_intel_sdw_acpi aesni_intel nls_ascii videodev snd_hda_codec mac80211 
gf128mul nls_cp437 eeepc_wmi videobuf2_common snd_hda_core crypto_simd vfat 
libarc4 asus_wmi mc snd_hwdep cryptd
Aug 12 22:32:38 AnonymPC kernel:  fat sparse_keymap snd_pcm iwlwifi acpi_ipmi 
rapl platform_profile snd_timer ipmi_si(+) cfg80211 intel_cstate battery usblp 
snd mei_me ipmi_devintf intel_uncore video intel_wmi_thunderbolt wmi_bmof 
rfkill pcspkr rc_core ee1004 soundcore mei ipmi_msghandler msr acpi_tad sg 
evdev parport_pc ppdev lp parport efi_pstore configfs nfnetlink ip_tables 
x_tables autofs4 ext4 crc16 mbcache jbd2 btrfs raid10 raid456 async_raid6_recov 
async_memcpy async_pq async_xor async_tx xor raid6_pq libcrc32c crc32c_generic 
raid1 raid0 md_mod hid_generic sr_mod usbhid uas cdrom sd_mod hid usb_storage 
iTCO_wdt ahci intel_pmc_bxt ast libahci iTCO_vendor_support xhci_pci 
drm_shmem_helper nvme libata watchdog xhci_hcd igb drm_kms_helper crc32_pclmul 
nvme_core scsi_mod i2c_i801 usbcore ioatdma i2c_algo_bit mxm_wmi drm 
crc32c_intel nvme_auth i2c_smbus scsi_common usb_common dca wmi button efivarfs
Aug 12 22:32:38 AnonymPC kernel: CPU: 3 UID: 0 PID: 1709 Comm: Xorg Tainted: P  
         O       6.12.38+deb13-amd64 #1  Debian 6.12.38-1
Aug 12 22:32:38 AnonymPC kernel: Tainted: [P]=PROPRIETARY_MODULE, [O]=OOT_MODULE
Aug 12 22:32:38 AnonymPC kernel: Hardware name: System manufacturer System 
Product Name/WS C422 PRO_SE, BIOS 4701 11/07/2024
Aug 12 22:32:38 AnonymPC kernel: RIP: 0010:drm_gem_shmem_vmap+0x173/0x1b0 
[drm_shmem_helper]
Aug 12 22:32:38 AnonymPC kernel: Code: 4c 8b 67 50 4d 85 e4 75 03 4c 8b 27 e8 f6 06 
67 e0 48 c7 c1 a0 f7 71 c0 4c 89 e2 48 c7 c7 75 f7 71 c0 48 89 c6 e8 6d 13 e2 df 
<0f> 0b 48 8b 83 f0 00 00 00 48 89 ee 48 8b 38 e8 59 22 6b e0 b8 fb
Aug 12 22:32:38 AnonymPC kernel: RSP: 0018:ffffa978c823fae8 EFLAGS: 00010282
Aug 12 22:32:38 AnonymPC kernel: RAX: 0000000000000000 RBX: ffff9676032d7800 
RCX: 0000000000000027
Aug 12 22:32:38 AnonymPC kernel: RDX: ffff967d7fda1748 RSI: 0000000000000001 
RDI: ffff967d7fda1740
Aug 12 22:32:38 AnonymPC kernel: RBP: ffff9676032daec8 R08: 0000000000000000 
R09: ffffa978c823f968
Aug 12 22:32:38 AnonymPC kernel: R10: ffffffffa20b43a8 R11: 0000000000000003 
R12: ffff9676022c7f20
Aug 12 22:32:38 AnonymPC kernel: R13: ffff96760699c000 R14: ffff9676032daec8 
R15: ffff9676032daec8
Aug 12 22:32:38 AnonymPC kernel: FS:  00007f2f6cd66b00(0000) 
GS:ffff967d7fd80000(0000) knlGS:0000000000000000
Aug 12 22:32:38 AnonymPC kernel: CS:  0010 DS: 0000 ES: 0000 CR0: 
0000000080050033
Aug 12 22:32:38 AnonymPC kernel: CR2: 0000556a7db0aa40 CR3: 0000000109116005 
CR4: 00000000003726f0
Aug 12 22:32:38 AnonymPC kernel: Call Trace:
Aug 12 22:32:38 AnonymPC kernel:  <TASK>
Aug 12 22:32:38 AnonymPC kernel:  drm_gem_vmap+0x22/0x50 [drm]
Aug 12 22:32:38 AnonymPC kernel:  drm_gem_vmap_unlocked+0x2a/0x50 [drm]
Aug 12 22:32:38 AnonymPC kernel:  drm_gem_fb_vmap+0x41/0x120 [drm_kms_helper]
Aug 12 22:32:38 AnonymPC kernel:  drm_atomic_helper_prepare_planes+0x17a/0x210 
[drm_kms_helper]
Aug 12 22:32:38 AnonymPC kernel:  drm_atomic_helper_commit+0x78/0x140 
[drm_kms_helper]
Aug 12 22:32:38 AnonymPC kernel:  drm_atomic_commit+0xa9/0xe0 [drm]
Aug 12 22:32:38 AnonymPC kernel:  ? __pfx___drm_printfn_info+0x10/0x10 [drm]
Aug 12 22:32:38 AnonymPC kernel:  drm_atomic_helper_set_config+0x74/0xb0 
[drm_kms_helper]
Aug 12 22:32:38 AnonymPC kernel:  drm_mode_setcrtc+0x46c/0x8a0 [drm]
Aug 12 22:32:38 AnonymPC kernel:  ? __pfx_drm_mode_setcrtc+0x10/0x10 [drm]
Aug 12 22:32:38 AnonymPC kernel:  drm_ioctl_kernel+0xad/0x100 [drm]
Aug 12 22:32:38 AnonymPC kernel:  drm_ioctl+0x277/0x4f0 [drm]
Aug 12 22:32:38 AnonymPC kernel:  ? __pfx_drm_mode_setcrtc+0x10/0x10 [drm]
Aug 12 22:32:38 AnonymPC kernel:  __x64_sys_ioctl+0x94/0xd0
Aug 12 22:32:38 AnonymPC kernel:  do_syscall_64+0x82/0x190
Aug 12 22:32:38 AnonymPC kernel:  ? do_user_addr_fault+0x36c/0x620
Aug 12 22:32:38 AnonymPC kernel:  ? clear_bhb_loop+0x40/0x90
Aug 12 22:32:38 AnonymPC kernel:  ? clear_bhb_loop+0x40/0x90
Aug 12 22:32:38 AnonymPC kernel:  ? clear_bhb_loop+0x40/0x90
Aug 12 22:32:38 AnonymPC kernel:  entry_SYSCALL_64_after_hwframe+0x76/0x7e
Aug 12 22:32:38 AnonymPC kernel: RIP: 0033:0x7f2f6d0e78db
Aug 12 22:32:38 AnonymPC kernel: Code: 00 48 89 44 24 18 31 c0 48 8d 44 24 60 c7 04 
24 10 00 00 00 48 89 44 24 08 48 8d 44 24 20 48 89 44 24 10 b8 10 00 00 00 0f 05 
<89> c2 3d 00 f0 ff ff 77 1c 48 8b 44 24 18 64 48 2b 04 25 28 00 00
Aug 12 22:32:38 AnonymPC kernel: RSP: 002b:00007ffe06c92cb0 EFLAGS: 00000246 
ORIG_RAX: 0000000000000010
Aug 12 22:32:38 AnonymPC kernel: RAX: ffffffffffffffda RBX: 0000556a7dec9040 
RCX: 00007f2f6d0e78db
Aug 12 22:32:38 AnonymPC kernel: RDX: 00007ffe06c92d40 RSI: 00000000c06864a2 
RDI: 000000000000000e
Aug 12 22:32:38 AnonymPC kernel: RBP: 00007ffe06c92d40 R08: 0000000000000000 
R09: 0000556a7dad98c0
Aug 12 22:32:38 AnonymPC kernel: R10: 0000556a7de2f318 R11: 0000000000000246 
R12: 00000000c06864a2
Aug 12 22:32:38 AnonymPC kernel: R13: 000000000000000e R14: 0000556a7de399c0 
R15: 0000556a7db86538
Aug 12 22:32:38 AnonymPC kernel:  </TASK>
Aug 12 22:32:38 AnonymPC kernel: ---[ end trace 0000000000000000 ]---
--
Aug 12 22:48:11 AnonymPC kernel: ------------[ cut here ]------------
Aug 12 22:48:11 AnonymPC kernel: ast 0000:04:00.0: [drm] 
drm_WARN_ON(map->is_iomem)
Aug 12 22:48:11 AnonymPC kernel: WARNING: CPU: 1 PID: 2834 at 
drivers/gpu/drm/drm_gem_shmem_helper.c:322 drm_gem_shmem_vmap+0x173/0x1b0 
[drm_shmem_helper]
Aug 12 22:48:11 AnonymPC kernel: Modules linked in: ipmi_ssif ccm snd_seq_dummy 
snd_hrtimer snd_seq snd_seq_device qrtr uinput nvidia_drm(PO) si2157 si2168 
m88rs6000t drm_ttm_helper a8293 ttm nvidia_modeset(PO) intel_rapl_msr 
intel_rapl_common intel_uncore_frequency intel_uncore_frequency_common cx25840 
skx_edac skx_edac_common nfit libnvdimm x86_pkg_temp_thermal cx23885 
intel_powerclamp snd_soc_avs altera_ci coretemp snd_soc_hda_codec tda18271 
kvm_intel snd_hda_ext_core altera_stapl snd_soc_core snd_hda_codec_realtek 
m88ds3103 kvm snd_hda_codec_generic snd_compress i2c_mux cx2341x 
snd_hda_scodec_component snd_hda_codec_hdmi snd_pcm_dmaengine irqbypass 
tveeprom nvidia(PO) crct10dif_pclmul videobuf2_dvb ghash_clmulni_intel dvb_core 
sha512_ssse3 videobuf2_dma_sg snd_hda_intel sha256_ssse3 binfmt_misc 
videobuf2_memops snd_intel_dspcfg sha1_ssse3 videobuf2_v4l2 iwlmvm 
snd_intel_sdw_acpi aesni_intel nls_ascii videodev snd_hda_codec mac80211 
gf128mul nls_cp437 eeepc_wmi videobuf2_common snd_hda_core crypto_simd vfat 
libarc4 asus_wmi mc
Aug 12 22:48:11 AnonymPC kernel:  snd_hwdep cryptd fat sparse_keymap snd_pcm 
iwlwifi acpi_ipmi rapl platform_profile snd_timer ipmi_si cfg80211 intel_cstate 
battery usblp snd mei_me ipmi_devintf intel_uncore video intel_wmi_thunderbolt 
wmi_bmof rfkill pcspkr rc_core ee1004 soundcore mei ipmi_msghandler msr 
acpi_tad sg evdev parport_pc ppdev lp parport efi_pstore configfs nfnetlink 
ip_tables x_tables autofs4 ext4 crc16 mbcache jbd2 btrfs raid10 raid456 
async_raid6_recov async_memcpy async_pq async_xor async_tx xor raid6_pq 
libcrc32c crc32c_generic raid1 raid0 md_mod hid_generic sr_mod usbhid uas cdrom 
sd_mod hid usb_storage iTCO_wdt ahci intel_pmc_bxt ast libahci 
iTCO_vendor_support xhci_pci drm_shmem_helper nvme libata watchdog xhci_hcd igb 
drm_kms_helper crc32_pclmul nvme_core scsi_mod i2c_i801 usbcore ioatdma 
i2c_algo_bit mxm_wmi drm crc32c_intel nvme_auth i2c_smbus scsi_common 
usb_common dca wmi button efivarfs
Aug 12 22:48:11 AnonymPC kernel: CPU: 1 UID: 0 PID: 2834 Comm: Xorg Tainted: P  
      W  O       6.12.38+deb13-amd64 #1  Debian 6.12.38-1
Aug 12 22:48:11 AnonymPC kernel: Tainted: [P]=PROPRIETARY_MODULE, [W]=WARN, 
[O]=OOT_MODULE
Aug 12 22:48:11 AnonymPC kernel: Hardware name: System manufacturer System 
Product Name/WS C422 PRO_SE, BIOS 4701 11/07/2024
Aug 12 22:48:11 AnonymPC kernel: RIP: 0010:drm_gem_shmem_vmap+0x173/0x1b0 
[drm_shmem_helper]
Aug 12 22:48:11 AnonymPC kernel: Code: 4c 8b 67 50 4d 85 e4 75 03 4c 8b 27 e8 f6 06 
67 e0 48 c7 c1 a0 f7 71 c0 4c 89 e2 48 c7 c7 75 f7 71 c0 48 89 c6 e8 6d 13 e2 df 
<0f> 0b 48 8b 83 f0 00 00 00 48 89 ee 48 8b 38 e8 59 22 6b e0 b8 fb
Aug 12 22:48:11 AnonymPC kernel: RSP: 0018:ffffa978c8eb7b48 EFLAGS: 00010286
Aug 12 22:48:11 AnonymPC kernel: RAX: 0000000000000000 RBX: ffff967603ec6e00 
RCX: 0000000000000027
Aug 12 22:48:11 AnonymPC kernel: RDX: ffff967d7fca1748 RSI: 0000000000000001 
RDI: ffff967d7fca1740
Aug 12 22:48:11 AnonymPC kernel: RBP: ffff967603ecbcc8 R08: 0000000000000000 
R09: ffffa978c8eb79c8
Aug 12 22:48:11 AnonymPC kernel: R10: ffffffffa20b43a8 R11: 0000000000000003 
R12: ffff9676022c7f20
Aug 12 22:48:11 AnonymPC kernel: R13: ffff96760699c000 R14: ffff967603ecbcc8 
R15: ffff967603ecbcc8
Aug 12 22:48:11 AnonymPC kernel: FS:  00007f04a9ae0b00(0000) 
GS:ffff967d7fc80000(0000) knlGS:0000000000000000
Aug 12 22:48:11 AnonymPC kernel: CS:  0010 DS: 0000 ES: 0000 CR0: 
0000000080050033
Aug 12 22:48:11 AnonymPC kernel: CR2: 00005586891c5420 CR3: 0000000101c40001 
CR4: 00000000003726f0
Aug 12 22:48:11 AnonymPC kernel: Call Trace:
Aug 12 22:48:11 AnonymPC kernel:  <TASK>
Aug 12 22:48:11 AnonymPC kernel:  drm_gem_vmap+0x22/0x50 [drm]
Aug 12 22:48:11 AnonymPC kernel:  drm_gem_vmap_unlocked+0x2a/0x50 [drm]
Aug 12 22:48:11 AnonymPC kernel:  drm_gem_fb_vmap+0x41/0x120 [drm_kms_helper]
Aug 12 22:48:11 AnonymPC kernel:  drm_atomic_helper_prepare_planes+0x17a/0x210 
[drm_kms_helper]
Aug 12 22:48:11 AnonymPC kernel:  drm_atomic_helper_commit+0x78/0x140 
[drm_kms_helper]
Aug 12 22:48:11 AnonymPC kernel:  drm_atomic_commit+0xa9/0xe0 [drm]
Aug 12 22:48:11 AnonymPC kernel:  ? __pfx___drm_printfn_info+0x10/0x10 [drm]
Aug 12 22:48:11 AnonymPC kernel:  drm_atomic_helper_set_config+0x74/0xb0 
[drm_kms_helper]
Aug 12 22:48:11 AnonymPC kernel:  drm_mode_setcrtc+0x46c/0x8a0 [drm]
Aug 12 22:48:11 AnonymPC kernel:  ? syscall_exit_to_user_mode+0x4d/0x210
Aug 12 22:48:11 AnonymPC kernel:  ? __pfx_drm_mode_setcrtc+0x10/0x10 [drm]
Aug 12 22:48:11 AnonymPC kernel:  drm_ioctl_kernel+0xad/0x100 [drm]
Aug 12 22:48:11 AnonymPC kernel:  drm_ioctl+0x277/0x4f0 [drm]
Aug 12 22:48:11 AnonymPC kernel:  ? __pfx_drm_mode_setcrtc+0x10/0x10 [drm]
Aug 12 22:48:11 AnonymPC kernel:  __x64_sys_ioctl+0x94/0xd0
Aug 12 22:48:11 AnonymPC kernel:  do_syscall_64+0x82/0x190
Aug 12 22:48:11 AnonymPC kernel:  ? clear_bhb_loop+0x40/0x90
Aug 12 22:48:11 AnonymPC kernel:  entry_SYSCALL_64_after_hwframe+0x76/0x7e
Aug 12 22:48:11 AnonymPC kernel: RIP: 0033:0x7f04a9e618db
Aug 12 22:48:11 AnonymPC kernel: Code: 00 48 89 44 24 18 31 c0 48 8d 44 24 60 c7 04 
24 10 00 00 00 48 89 44 24 08 48 8d 44 24 20 48 89 44 24 10 b8 10 00 00 00 0f 05 
<89> c2 3d 00 f0 ff ff 77 1c 48 8b 44 24 18 64 48 2b 04 25 28 00 00
Aug 12 22:48:11 AnonymPC kernel: RSP: 002b:00007ffd91b664d0 EFLAGS: 00000246 
ORIG_RAX: 0000000000000010
Aug 12 22:48:11 AnonymPC kernel: RAX: ffffffffffffffda RBX: 00005586891c5410 
RCX: 00007f04a9e618db
Aug 12 22:48:11 AnonymPC kernel: RDX: 00007ffd91b66560 RSI: 00000000c06864a2 
RDI: 000000000000000f
Aug 12 22:48:11 AnonymPC kernel: RBP: 00007ffd91b66560 R08: 0000000000000000 
R09: 0000558688d4e280
Aug 12 22:48:11 AnonymPC kernel: R10: 00005586890a45b8 R11: 0000000000000246 
R12: 00000000c06864a2
Aug 12 22:48:11 AnonymPC kernel: R13: 000000000000000f R14: 0000558689141720 
R15: 0000558688dfb5c8
Aug 12 22:48:11 AnonymPC kernel:  </TASK>
Aug 12 22:48:11 AnonymPC kernel: ---[ end trace 0000000000000000 ]---

In bookworm, this didn't happen, or I didn't notice it.  Probably connected: 
http://bugs.debian.org/1110954 .
Clearly, I don't wish to blacklist drivers or turn the AST chip off in 
BIOS/UEFI (e.g., for emergencies, or if I take the NVIDIA card out, or if I 
ever attach a second, real monitor via the VGA socket). My only workaround 
sofar is manually issuing `xrandr --auto`. I kindly ask to de-bug the software 
involved, whichever it may be.

Gratefully,
Peter

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