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Unable to have session span multiple monitors on Workspace 1903 on Mojave


Question

I'm running Workspace 1903 on Mojave on a MacBook Pro, connected to dual external Dell 34" monitors running natively at 3440x1440. The client session is a Windows 10 1703 VM running the 7.15 LTSR VDA.

 

When trying to enter full-screen mode with the Use All Displays in Full Screen flag set, the session window flashes, the machine error-beeps, then the session returns to its previous size. The following is the relevant section of the Viewer log file.

| 05-26-2019 | 10:03:06.197 | 34245 | 18 |        tw2cmd.c |  979 |      Tw2CmdInit |    TC_TW | TT_TW2_CONNECT | thinWireVersion = 2 TW2VersionIncrement=1
| 05-26-2019 | 10:03:06.197 | 34245 | 18 |        tw2cmd.c |  999 |      Tw2CmdInit |    TC_TW | TT_TW2_CONNECT|TT_TW2_PROTOCOL | tw2ColorMode = 5 (RGB 24 bpp)
| 05-26-2019 | 10:03:06.197 | 34245 | 18 |        tw2cmd.c | 1022 |      Tw2CmdInit |    TC_TW | TT_TW2_CONNECT | pInst->colorMode = 7
| 05-26-2019 | 10:03:06.197 | 34245 | 18 |        tw2cmd.c | 1045 |      Tw2CmdInit |    TC_TW | TT_TW2_CONNECT | session width = 6880, height = 1440 
| 05-26-2019 | 10:03:06.197 | 34245 | 18 |        tw2cmd.c | 1061 |      Tw2CmdInit |    TC_TW | TT_TW2_CONNECT|TT_TW2_PROTOCOL | pCache->cachePower = 24 
| 05-26-2019 | 10:03:06.197 | 34245 | 18 |        tw2cmd.c | 1072 |      Tw2CmdInit |    TC_TW | TT_TW2_CONNECT|TT_TW2_PROTOCOL | pCache->handlePower = 15
| 05-26-2019 | 10:03:06.197 | 34245 | 18 |        tw2cmd.c | 1083 |      Tw2CmdInit |    TC_TW | TT_TW2_CONNECT|TT_TW2_PROTOCOL | pCache->maxObjectLength = 1396053
| 05-26-2019 | 10:03:06.197 | 34245 | 18 |        tw2cmd.c | 1106 |      Tw2CmdInit |    TC_TW | TT_TW2_CONNECT|TT_TW2_PROTOCOL | DiskCache disabled: pCache->minDiskObjectLength = 0 
| 05-26-2019 | 10:03:06.197 | 34245 | 18 |        tw2cmd.c | 1115 |      Tw2CmdInit |    TC_TW | TT_TW2_CONNECT|TT_TW2_PROTOCOL | pCache->initialSeedValue = 0 
| 05-26-2019 | 10:03:06.197 | 34245 | 18 |        tw2cmd.c | 1121 |      Tw2CmdInit |    TC_TW | TT_TW2_CONNECT | pCache->maxMemoryAllocationPower = 30 
| 05-26-2019 | 10:03:06.202 | 34245 | 18 |        tw2cmd.c |  867 |  SendAckTw2Init |    TC_TW | TT_TW2_ENTRY_EXIT1 | SendAckTw2Init entered: Send COMMAND_TW2_C2S_ACK_TW2_INIT
| 05-26-2019 | 10:03:06.202 | 34245 | 18 |        tw2cmd.c |  884 |  SendAckTw2Init |    TC_TW | TT_TW2_ENTRY_EXIT1 | SendAckTw2Init finished
| 05-26-2019 | 10:03:06.442 | 34245 | 23 |       twvdcmn.c |  203 |   TwDispatchCmd |    TC_TW | TT_TW2_COMMAND | Received CMD_TW2_INIT command
| 05-26-2019 | 10:03:06.442 | 34245 | 23 |       twvdcmn.c |  204 |   TwDispatchCmd |    TC_TW | TT_TW2_COMMAND | Buffer dump follows (0x7fcd8ba20061, 168):
03 08 51 DE A7 05 84 80 0A C0 18 0F D5 9A 55 00   ..Q...........U.
00 81 00 15 00 00 12 04 00 0E 00 02 00 00 02 18   ................
40 40 00 FF FF FF FF 04 00 04 00 04 00 06 00 04   @@..............
00 07 00 04 00 08 00 04 00 0C 00 08 00 0D 00 04   ................
00 65 00 04 00 0E 00 06 00 10 00 09 00 1C 00 11   .e..............
00 08 00 00 00 01 00 00 01 00 00 00 00 C0 0A 80   ................
04 00 00 00 00 C0 0A 80 04 04 00 15 00 04 00 16   ................
00 08 00 17 00 04 00 00 00 04 00 19 00 05 00 1A   ................
00 00 06 00 1E 00 01 00 04 00 1F 00 0A 00 21 00   ..............!.
01 00 00 00 00 00 BB 49 A9 74 48 F9 40 DB 53 1A   .......I.tH.@.S.
79 D0 24 EB 9E 86 C1 02                           y.$.....
| 05-26-2019 | 10:03:06.448 | 34245 | 23 |        tw2cmd.c |  979 |      Tw2CmdInit |    TC_TW | TT_TW2_CONNECT | thinWireVersion = 2 TW2VersionIncrement=1
| 05-26-2019 | 10:03:06.448 | 34245 | 23 |        tw2cmd.c |  999 |      Tw2CmdInit |    TC_TW | TT_TW2_CONNECT|TT_TW2_PROTOCOL | tw2ColorMode = 5 (RGB 24 bpp)
| 05-26-2019 | 10:03:06.448 | 34245 | 23 |        tw2cmd.c | 1022 |      Tw2CmdInit |    TC_TW | TT_TW2_CONNECT | pInst->colorMode = 7
| 05-26-2019 | 10:03:06.448 | 34245 | 23 |        tw2cmd.c | 1045 |      Tw2CmdInit |    TC_TW | TT_TW2_CONNECT | session width = 2752, height = 1152 
| 05-26-2019 | 10:03:06.448 | 34245 | 23 |        tw2cmd.c | 1061 |      Tw2CmdInit |    TC_TW | TT_TW2_CONNECT|TT_TW2_PROTOCOL | pCache->cachePower = 24 
| 05-26-2019 | 10:03:06.448 | 34245 | 23 |        tw2cmd.c | 1072 |      Tw2CmdInit |    TC_TW | TT_TW2_CONNECT|TT_TW2_PROTOCOL | pCache->handlePower = 15
| 05-26-2019 | 10:03:06.448 | 34245 | 23 |        tw2cmd.c | 1083 |      Tw2CmdInit |    TC_TW | TT_TW2_CONNECT|TT_TW2_PROTOCOL | pCache->maxObjectLength = 1396053
| 05-26-2019 | 10:03:06.448 | 34245 | 23 |        tw2cmd.c | 1106 |      Tw2CmdInit |    TC_TW | TT_TW2_CONNECT|TT_TW2_PROTOCOL | DiskCache disabled: pCache->minDiskObjectLength = 0 
| 05-26-2019 | 10:03:06.448 | 34245 | 23 |        tw2cmd.c | 1115 |      Tw2CmdInit |    TC_TW | TT_TW2_CONNECT|TT_TW2_PROTOCOL | pCache->initialSeedValue = 0 
| 05-26-2019 | 10:03:06.448 | 34245 | 23 |        tw2cmd.c | 1121 |      Tw2CmdInit |    TC_TW | TT_TW2_CONNECT | pCache->maxMemoryAllocationPower = 30 
| 05-26-2019 | 10:03:06.454 | 34245 | 23 |        tw2cmd.c |  867 |  SendAckTw2Init |    TC_TW | TT_TW2_ENTRY_EXIT1 | SendAckTw2Init entered: Send COMMAND_TW2_C2S_ACK_TW2_INIT
| 05-26-2019 | 10:03:06.454 | 34245 | 23 |        tw2cmd.c |  884 |  SendAckTw2Init |    TC_TW | TT_TW2_ENTRY_EXIT1 | SendAckTw2Init finished

There do not appear to be any client-side event log entries coincidental with the screen resolution change.

 

Any ideas?

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And just found my own answer here: https://support.citrix.com/article/CTX201696

 

Windows 10 – Supports up to 8 monitors. Display resolution is limited to 4094 pixels in any dimension on 7.15 LTSR VDAs. On 7.16 and greater VDAs, display resolution is only limited by the Windows OS capabilities or the available video memory for the machine. The amount of video memory that a Citrix session can consume can be configured via Citrix policy. The default value for the Display memory Limit policy is 65536KB and this is sufficient for up to 2x4K monitors (2x32400KB). 

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