[Bug 64661] udl causes blank screen

[bugzilla-daemon at bugzilla.kernel.org]

https://bugzilla.kernel.org/show_bug.cgi?id=64661

Austin Robertson <austinrobertson at gmail.com> changed:

           What    |Removed                     |Added
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                 CC|                            |austinrobertson at gmail.com

--- Comment #7 from Austin Robertson <austinrobertson at gmail.com> ---
(In reply to Jason Schulz from comment #6)
> Later versions of either the nvidia drivers or kernel have fixed this
> problem.

What versions of the nVidia driver and kernel do you have this working with?
I've been trying to resolve the same problem. 

I get the same message in dmesg indicating from udl that the swiotlb buffer is
full. Here's the relevant dmesg.debug from my machine:

[  133.947952] [drm:drm_mode_getconnector] [CONNECTOR:22:?]
[  133.947960] [drm:drm_helper_probe_single_connector_modes_merge_bits]
[CONNECTOR:22:DVI-I-1]
[  134.107906] [drm:drm_helper_probe_single_connector_modes_merge_bits]
[CONNECTOR:22:DVI-I-1] probed modes :
[  134.107916] [drm:drm_mode_debug_printmodeline] Modeline 24:"1920x1080" 60
148500 1920 2008 2052 2200 1080 1084 1089 1125 0x48 0x5
[  134.107920] [drm:drm_mode_debug_printmodeline] Modeline 31:"1280x1024" 75
135000 1280 1296 1440 1688 1024 1025 1028 1066 0x40 0x5
[  134.107925] [drm:drm_mode_debug_printmodeline] Modeline 26:"1280x1024" 60
108000 1280 1328 1440 1688 1024 1025 1028 1066 0x40 0x5
[  134.107929] [drm:drm_mode_debug_printmodeline] Modeline 25:"1152x864" 75
108000 1152 1216 1344 1600 864 865 868 900 0x40 0x5
[  134.107933] [drm:drm_mode_debug_printmodeline] Modeline 32:"1024x768" 75
78800 1024 1040 1136 1312 768 769 772 800 0x40 0x5
[  134.107937] [drm:drm_mode_debug_printmodeline] Modeline 33:"1024x768" 60
65000 1024 1048 1184 1344 768 771 777 806 0x40 0xa
[  134.107941] [drm:drm_mode_debug_printmodeline] Modeline 34:"800x600" 75
49500 800 816 896 1056 600 601 604 625 0x40 0x5
[  134.107945] [drm:drm_mode_debug_printmodeline] Modeline 27:"800x600" 60
40000 800 840 968 1056 600 601 605 628 0x40 0x5
[  134.107949] [drm:drm_mode_debug_printmodeline] Modeline 28:"640x480" 75
31500 640 656 720 840 480 481 484 500 0x40 0xa
[  134.107953] [drm:drm_mode_debug_printmodeline] Modeline 29:"640x480" 60
25200 640 656 752 800 480 490 492 525 0x40 0xa
[  134.107957] [drm:drm_mode_debug_printmodeline] Modeline 30:"720x400" 70
28320 720 738 846 900 400 412 414 449 0x40 0x6
[  134.107990] [drm:drm_mode_getconnector] [CONNECTOR:22:?]
[  134.131440] udl 1-1.4.3:1.0: swiotlb buffer is full (sz: 2097152 bytes)
[  134.131447] DMA: Out of SW-IOMMU space for 2097152 bytes at device
1-1.4.3:1.0
[  134.131825] [drm:drm_mode_addfb2] [FB:37]
[  134.131843] [drm:drm_mode_setcrtc] [CRTC:20]
[  134.131881] [drm:drm_crtc_check_viewport] Invalid fb size 1024x768 for CRTC
viewport 1920x1080+0+0.


This is with Linux 4.2.5-1 and nVidia 358.16:

$ cat /proc/driver/nvidia/version
NVRM version: NVIDIA UNIX x86_64 Kernel Module  358.16  Mon Nov 16 19:25:55 PST
2015
GCC version:  gcc version 5.2.0 (GCC) 
$ uname -a
Linux archie 4.2.5-1-ARCH #1 SMP PREEMPT Tue Oct 27 08:13:28 CET 2015 x86_64
GNU/Linux

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