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:~$ 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