I am very new to Linux, but have been enjoying the challenge of learning this new operating system...though it has been quite a steep learning curve and often frustrating. I have recently installed "Debian Stretch Uspace RT-PREEMPT" for use as the operating system to run an application called "Linux CNC". The particular *.iso that I used is the 64bit r8 version that can be found here http://linuxcnc.org/testing-stretch-rtpreempt/.
When I tested this distribution of Debian out using the USB booted "Live" mode, my display worked great and it successfully found and loaded the "Acer Inc 22" display of my computer, which is an Acer Aspire Z3771-UR20P all-in-one. The 1920x1080 resolution provided excellent results.
However, after installing Debian off the same USB drive, the only display that shows up in the Settings Editor is called "Default" and it will only provide an extremely annoying 1024x768 resolution. After some searching, I first tried to add another resolution to this "Default" display using Xrandr in the terminal. This resulted in an error stating "failed to get size of gamma for output default". I believe that I need to somehow load and/or have Debian recognize the driver for my display.
In order to help describe my problem for anybody willing to help, I will share some details about my specific system...
1. This command to identify the Intel on-chip video processor:
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sudo lspci -knn | grep -iA2 vga
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00:02.0 VGA compatible controller [0300]: Intel Corporation 2nd Generation Core Processor Family Integrated Graphics Controller [8086:0102] (rev 09)
Subsystem: Acer Incorporated [ALI] 2nd Generation Core Processor Family Integrated Graphics Controller [1025:0640]
Kernel modules: i915
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sudo apt install firmware-linux-nonfree libgl1-mesa-dri xserver-xorg-video-ati
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Reading package lists... Done
Building dependency tree
Reading state information... Done
libgl1-mesa-dri is already the newest version (13.0.6-1+b2).
libgl1-mesa-dri set to manually installed.
xserver-xorg-video-ati is already the newest version (1:7.8.0-1+b1).
xserver-xorg-video-ati set to manually installed.
firmware-linux-nonfree is already the newest version (20161130-3).
firmware-linux-nonfree set to manually installed.
0 upgraded, 0 newly installed, 0 to remove and 15 not upgraded.
I would be most grateful to anybody who can assist me with getting the correct display driver to load. I apologize in advance if this is a 'newbie' question. I have spend many hours trying to search for fixes and all of those that I have found did not work. Step-by-step instructions would be appreciated as I am very new to Linux and not familiar with many of the nuances yet.
Thank you in advance!
JJ