Luca Capra

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    Luca Capra commented  · 

    Hi,
    I want to add my experience with ubuntu 21.04 (+nvidia driver) and display link driver.

    Some specs
    - Linux vin 5.11.0-18-generic #19-Ubuntu SMP Fri May 7 14:22:03 UTC 2021 x86_64 x86_64 x86_64 GNU/Linux
    - Nvidia Driver Version: 460.80 CUDA Version: 11.2
    - Display link 5.4.0-55.153.

    1. after clean boot or after wake up from sleep, while loading the UI, the pc freeze if the display link port is connected. No terminal, no responses.
    2. setting properties for the displays (moving, ordering etc) also freeze the pc
    3. I can use the display link device if connected after login but it shows some mouse flickering

    Glad to provide more feedback if needed

    update 1: uninstalling nvidia driver made the pc work again

    update 2: in kern.log I also found this trace

    Jun 21 08:49:36 vin kernel: [ 55.291787] RIP: 0010:dma_buf_vunmap+0x82/0x90
    Jun 21 08:49:36 vin kernel: [ 55.291793] Code: e6 48 89 df e8 ff c2 7c 00 80 7b 58 00 48 c7 43 50 00 00 00 00 74 04 c6 43 58 00 4c 89 ef e8 55 d4 40 00 5b 41 5c 41 5d 5d c3 <0f> 0b 0f 0b c3 0f 0b 0f 0b 0f 1f 44 00 00 0f 1f 44 00 00 55 48 89
    Jun 21 08:49:36 vin kernel: [ 55.291795] RSP: 0018:ffffa69c41c2fca0 EFLAGS: 00010202
    Jun 21 08:49:36 vin kernel: [ 55.291799] RAX: ffffa69c45001000 RBX: ffff9b7a51483600 RCX: 0000000000000000
    Jun 21 08:49:36 vin kernel: [ 55.291801] RDX: 0000000000000000 RSI: ffffa69c41c2fcc8 RDI: ffff9b7a51483600
    Jun 21 08:49:36 vin kernel: [ 55.291803] RBP: ffffa69c41c2fcb8 R08: 0000000000000001 R09: 0000000000000000
    Jun 21 08:49:36 vin kernel: [ 55.291805] R10: 0000000000000001 R11: ffff9b7a5611ef00 R12: ffffa69c41c2fcc8
    Jun 21 08:49:36 vin kernel: [ 55.291807] R13: ffff9b7a58d59dd8 R14: ffff9b7a52fa5f28 R15: ffff9b7a52fa5e38
    Jun 21 08:49:36 vin kernel: [ 55.291809] FS: 00007f71c4056a40(0000) GS:ffff9b7daed00000(0000) knlGS:0000000000000000
    Jun 21 08:49:36 vin kernel: [ 55.291812] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
    Jun 21 08:49:36 vin kernel: [ 55.291814] CR2: 000055e0dca40370 CR3: 00000001074ae004 CR4: 00000000003706e0
    Jun 21 08:49:36 vin kernel: [ 55.291816] Call Trace:
    Jun 21 08:49:36 vin kernel: [ 55.291820] evdi_gem_vunmap+0xb0/0xd0 [evdi]
    Jun 21 08:49:36 vin kernel: [ 55.291828] evdi_gem_free_object+0x1c/0xc0 [evdi]
    Jun 21 08:49:36 vin kernel: [ 55.291834] drm_gem_object_free+0x1d/0x30 [drm]
    Jun 21 08:49:36 vin kernel: [ 55.291861] drm_gem_object_handle_put_unlocked+0xc5/0xe0 [drm]
    Jun 21 08:49:36 vin kernel: [ 55.291882] drm_gem_object_release_handle+0x71/0x80 [drm]
    Jun 21 08:49:36 vin kernel: [ 55.291903] drm_gem_handle_delete+0x59/0xa0 [drm]
    Jun 21 08:49:36 vin kernel: [ 55.291925] ? drm_mode_destroy_dumb+0x50/0x50 [drm]
    Jun 21 08:49:36 vin kernel: [ 55.291953] drm_gem_dumb_destroy+0x10/0x20 [drm]
    Jun 21 08:49:36 vin kernel: [ 55.291974] drm_mode_destroy_dumb_ioctl+0x33/0x50 [drm]
    Jun 21 08:49:36 vin kernel: [ 55.292001] drm_ioctl_kernel+0xae/0xf0 [drm]
    Jun 21 08:49:36 vin kernel: [ 55.292024] drm_ioctl+0x245/0x400 [drm]
    Jun 21 08:49:36 vin kernel: [ 55.292047] ? drm_mode_destroy_dumb+0x50/0x50 [drm]
    Jun 21 08:49:36 vin kernel: [ 55.292075] ? __do_munmap+0x329/0x520
    Jun 21 08:49:36 vin kernel: [ 55.292080] __x64_sys_ioctl+0x91/0xc0
    Jun 21 08:49:36 vin kernel: [ 55.292084] do_syscall_64+0x38/0x90
    Jun 21 08:49:36 vin kernel: [ 55.292087] entry_SYSCALL_64_after_hwframe+0x44/0xa9
    Jun 21 08:49:36 vin kernel: [ 55.292091] RIP: 0033:0x7f71c44d8ecb

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