linux-lowlatency-hwe-20.04

I installed:
" linux-lowlatency " which installed kernel 5.4 and I had very low resolution.

Then I installed
linux-lowlatency-hwe-20.04
linux-lowlatency-hwe-20.04-edge
which installed kernel 5.8

Yesterday kernel lowlatency worked, today not working with nvidia.
I tried update system today, but it not helped.

Questions:

1. Is any documentation for what it is "hwe" and "edge" from
"linux-lowlatency-hwe-20.04-edge" ?

2. I use Linux Mint 20.1 and kernel lowlatency and sometimes nvidia driver not working. More often does not work.

========================================================================
I've compared Xorg.0.log with Meld and
with low latency is missing line for example:
-------------------------
[ 13.804] (II) xfree86: Adding drm device (/dev/dri/card0)
[ 13.806] (**) OutputClass "nvidia" ModulePath extended to "/usr/lib/x86_64-linux-gnu/nvidia/xorg,/usr/lib/xorg/modules"
...
[ 13.845] (II) Applying OutputClass "nvidia" to /dev/dri/card0
[ 13.845] loading driver: nvidia
[ 14.084] (==) Matched nvidia as autoconfigured driver 0
...
[ 14.084] (II) LoadModule: "nvidia"
[ 14.084] (II) Loading /usr/lib/x86_64-linux-gnu/nvidia/xorg/nvidia_drv.so
[ 14.093] (II) Module nvidia: vendor="NVIDIA Corporation"
[ 14.093] compiled for 1.6.99.901, module version = 1.0.0
[ 14.093] Module class: X.Org Video Driver
...
[ 14.100] (II) NVIDIA dlloader X Driver 460.39 Thu Jan 21 21:54:11 UTC 2021
[ 14.100] (II) NVIDIA Unified Driver for all Supported NVIDIA GPUs
...
[ 14.104] (II) Loading sub module "fb"
[ 14.104] (II) LoadModule: "fb"
[ 14.104] (II) Loading /usr/lib/xorg/modules/libfb.so
[ 14.105] (II) Module fb: vendor="X.Org Foundation"
[ 14.105] compiled for 1.20.9, module version = 1.0.0
[ 14.105] ABI class: X.Org ANSI C Emulation, version 0.4
[ 14.105] (II) Loading sub module "wfb"
[ 14.105] (II) LoadModule: "wfb"
...
-------------------------

Then with lowlatency kernel I have
--------------
[ 13.187] (EE) [drm] Failed to open DRM device for pci:0000:01:00.0: -19
...
[ 13.188] (EE) Screen 0 deleted because of no matching config section.
--------------

From other Xorg.log with 5.8.0-44-lowlatency #50~20.04.1-Ubuntu
the same error:
--------------
...
[ 12.110] (EE) [drm] Failed to open DRM device for pci:0000:01:00.0: -19
[ 12.110] (EE) open /dev/dri/card0: No such file or directory
[ 12.110] (WW) Falling back to old probe method for modesetting
[ 12.110] (EE) open /dev/dri/card0: No such file or directory
[ 12.110] (II) Loading sub module "fbdevhw"
[ 12.110] (II) LoadModule: "fbdevhw"
[ 12.110] (II) Loading /usr/lib/xorg/modules/libfbdevhw.so
[ 12.111] (II) Module fbdevhw: vendor="X.Org Foundation"
[ 12.111] compiled for 1.20.9, module version = 0.0.2
[ 12.111] ABI class: X.Org Video Driver, version 24.1
[ 12.111] (**) FBDEV(1): claimed PCI slot 1@0:0:0
[ 12.111] (II) FBDEV(1): using default device
[ 12.111] (EE) Screen 0 deleted because of no matching config section.
...
--------------
-------------------------------------------------------------------
$ apt policy linux-lowlatency-hwe-20.04
linux-lowlatency-hwe-20.04:
  Installed: 5.8.0.44.50~20.04.30
  Candidate: 5.8.0.44.50~20.04.30
  Version table:
 *** 5.8.0.44.50~20.04.30 500
        500 http://archive.ubuntu.com/ubuntu focal-updates/main amd64 Packages
        500 http://security.ubuntu.com/ubuntu focal-security/main amd64 Packages
        100 /var/lib/dpkg/status
     5.4.0.26.32 500
        500 http://archive.ubuntu.com/ubuntu focal/main amd64 Packages
-------------------------------------------------------------------
-------------------------------------------------------------------
$ inxi -Fxxxrz
System:
  Kernel: 5.8.0-44-generic x86_64 bits: 64 compiler: N/A
  Desktop: MATE 1.24.0 info: mate-panel wm: marco 1.24.0 dm: LightDM 1.30.0
  Distro: Linux Mint 20.1 Ulyssa base: Ubuntu 20.04 focal
Machine:
  Type: Desktop Mobo: MSI model: B150M PRO-VDH (MS-7982) v: 1.0
  serial: <filter> UEFI [Legacy]: American Megatrends v: 3.H0
  date: 07/10/2018
CPU:
  Topology: Quad Core model: Intel Core i5-6400 bits: 64 type: MCP
  arch: Skylake-S rev: 3 L2 cache: 6144 KiB
  flags: avx avx2 lm nx pae sse sse2 sse3 sse4_1 sse4_2 ssse3 vmx
  bogomips: 21599
  Speed: 1539 MHz min/max: 800/3300 MHz Core speeds (MHz): 1: 1539 2: 1427
  3: 2087 4: 1516
Graphics:
  Device-1: NVIDIA GK106 [GeForce GTX 660] vendor: Gigabyte driver: nvidia
  v: 460.39 bus ID: 01:00.0 chip ID: 10de:11c0
  Display: x11 server: X.Org 1.20.9 driver: nvidia
  unloaded: fbdev,modesetting,nouveau,vesa compositor: marco v: 1.24.0
  resolution: 1920x1080~60Hz
  OpenGL: renderer: GeForce GTX 660/PCIe/SSE2 v: 4.6.0 NVIDIA 460.39
  direct render: Yes
-------------------------------------------------------------------
With lowlatency kernel system automatically switches to mesa driver in very low resolution:
-------------------------------------------------------------------
Graphics:
  Device-1: NVIDIA GK106 [GeForce GTX 660] vendor: Gigabyte driver: nvidia
  v: 460.39 bus ID: 01:00.0 chip ID: 10de:11c0
  Display: x11 server: X.Org 1.20.9 driver: fbdev,modesetting,nouveau
  unloaded: vesa compositor: marco v: 1.24.0 resolution: 640x480~73Hz
  OpenGL: renderer: llvmpipe (LLVM 11.0.0 256 bits) v: 4.5 Mesa 20.2.6
  compat-v: 3.1 direct render: Yes
-------------------------------------------------------------------