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The external monitor connected to a laptop through a Thunderbolt dock may have no video. The issue occurs when the LCD lid is in a closed state and the laptop turns on by pressing the power button on the Thunderbolt dock. The issue occurs only when "Use LVM and encryption" is selected and Thunderbolt technology is enabled. In this scenario, even if entering the Full Disk Encryption (LUKS) password blindly, the external monitor continues to show no video. Affected Platforms: Alienware 16 Area-51 AA16250 Alienware 16 Aurora AC16250 Alienware 16X Aurora AC16251 Alienware 18 Area-51 AA18250 Dell 14 D14260 Dell 14 DC14250 Dell 14 Plus 2-in-1 DB04250 Dell 14 Plus DB14250 Dell 14S DS14260 Dell 15 D15260 Dell 15 DC15250 Dell 15 DC15255 Dell 16 DC16250 Dell 16 DC16251 Dell 16 Plus 2-in-1 DB06250 Dell 16 Plus DB16250 Dell 16 Premium DA16250 Dell 16S DS16260 Dell Pro 13 Plus PB13250 Dell Pro 13 Premium PA13250 Dell Pro 14 Essential PV14250 Dell Pro 14 Essential PV14255 Dell Pro 14 PC14250 Dell Pro 14 Plus PB14250 Dell Pro 14 Premium PA14250 Dell Pro 14 Premium PA14260 Dell Pro 15 Essential PV15250 Dell Pro 16 PC16250 Dell Pro 16 Plus PB16250 Dell Pro 3 14 P314260 Dell Pro 3 16 P316260 Dell Pro 5 14 P514260 Dell Pro 5 16 P516260 Dell Pro 7 13 2-in-1 P703260 Dell Pro 7 13 P713260 Dell Pro 7 14 2-in-1 P704260 Dell Pro Essential 14 PV14260 Dell Pro Essential 15 PV15260 Dell Pro Max 14 MC14250 Dell Pro Max 14 Premium MA14250 Dell Pro Max 16 MC16250 Dell Pro Max 16 Plus MB16250 Dell Pro Max 16 Premium MA16250 Dell Pro Max 18 Plus MB18250 Dell Pro Max MC14255 Dell Pro Max MC16255 Dell Pro Precision 5 14 PW514261 Dell Pro Precision 5 14S PW514260 Dell Pro Precision 5 16 PW516261 Dell Pro Precision 5 16S PW516260 Dell Pro Precision 7 14 PW714260 Dell Pro Precision 7 16 PW716260 Dell Pro Rugged 10 Tablet RA00260 Dell Pro Rugged 12 Tablet RA02260 XPS 13 DX13260 XPS 14 (Dell 14 Premium) DA14250 XPS 14 DA14260 XPS 16 DA16260 Affected Operating System: Ubuntu 24.04 with kernel version lower than 6.17.0-1026
The required GPU driver resides on the encrypted root file system and cannot load until the passphrase is entered. This delay causes a timeout and triggers the tb_dp_resource_unavailable error.
Note: Before starting the update, perform the following: Back up all personal data. For more information, refer to Back Up and Recovery . Connect the AC adapter. Updating the Ubuntu Kernel to version 6.17.0-1026 or later on the computer resolves the issue. To update, refer to How to Upgrade your Ubuntu Operating System to the Latest Version . Note: After updating the Kernel to 6.17.0-1026, the external monitor connected through Thunderbolt may still not display the Full Disk Encryption (LUKS) password input screen. You must enter the password blindly. After the GPU driver loads, the display on the external monitor returns. This is a limitation of the current design of the Ubuntu OS.
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