I'm trying to figure out what can cause Tails to use a wrong resolution after changing my monitor. My Asus 24" screen worked without trouble with Tails in 1920x1080 mode. I replaced it with a Samsung 24" which works well in 1920x1080 under Windows. However Tails would no longer detect anything over 1024x768 and even starts at 120Hz which gives a picture of insufficient height (photo at end of post). Switching to 50Hz solves the height issue but this has to be done at each startup and I want to use the 1920x1080 resolution as before.

I have tried various xrandr options but none work correctly. At best I get a 1080 pixels high picture but with a 4cm black spacing from either edge, hence a slightly horizontally crushed picture. The Auto mode of the monitor won't help.

I finally tried using the nomodeset at boot (tab option) but this will only allow 1024x768. Any hints ? Any help appreciated (thanks in advance).

I tried adding the 1920x1080 mode this way:

amnesia@amnesia:~$ cvt 1920 1080
# 1920x1080 59.96 Hz (CVT 2.07M9) hsync: 67.16 kHz; pclk: 173.00 MHz
Modeline "1920x1080_60.00"  173.00  1920 2048 2248 2576  1080 1083 1088 1120 -hsync +vsync
amnesia@amnesia:~$ xrandr --newmode "1920x1080_60.00"  173.00  1920 2048 2248 2576  1080 1083 1088 1120 -hsync +vsync
X Error of failed request:  BadName (named color or font does not exist)
  Major opcode of failed request:  140 (RANDR)
  Minor opcode of failed request:  16 (RRCreateMode)
  Serial number of failed request:  35
  Current serial number in output stream:  35
amnesia@amnesia:~$ xrandr --addmode DVI-I-1 1920x1080_60.00

As I was stuck I thought it could be useful to get more details of the monitor and the graphics card using DriversCloud under Windows. Here's what I got:

ID EDID             SAM0d93

Model               S24D330

Manufacturer            Samsung     

Maximum Resolution      1920 x 1080

Screen size     24.0" (53 cm x 30 cm)

Horizontal frequency        30kHz-81kHz

Vertical frequency verticale        56Hz-75Hz

Maximum pixel clock 170 MHz

Date of manufacture     25/11/2019

Aspect Ratio            16:9

EDID Version            1.3

Gamma               2.20

DPMS                Active Off

Video input type        Composite Sync Sync on Green 0.7V/0.3V (1Vp-p) Analog Signal
GPU             NVIDIA GeForce GTX 660

Video RAM       2 Gb

Video RAM Type          GDDR5

Manufacturer Name           NVIDIA Corporation (ID: 0x10DE)

Nom du périphérique         GK106 [GeForce GTX 660] (Manufacturer ID: 0x10DE,Model ID: 0x11C0)

Type                    Display (Class: 0x03)

Sub-type                Display (Sub-class: 0x00)

Revision ID         0xA1

Tails start at 1024x768 120Hz No problem under Windows

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