I just installed Debian 9 netinst with Fluxbox.
After installation the resolution is chaged to 800x600, but it should be 1920x1080.
I tried changing it with xrandr, adding another mode, and I also tried changing grub.config. But I keep gettingthe following error message:
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xrandr: Failed to get size of gamma for output default
For example, this is the output of xrandr --query:
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xrandr: Failed to get size of gamma for output default
Screen 0: minimum 800 x 600, current 800 x 600, maximum 800 x 600
default connected 800x600+0+0 0mm x 0mm
800x600 75.00*
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*-display UNCLAIMED
description: VGA compatible controller
product: Oland PRO [Radeon R7 240/340]
vendor: Advanced Micro Devices, Inc. [AMD/ATI]
physical id: 0
bus info: pci@0000:01:00.0
version: 00
width: 64 bits
clock: 33MHz
capabilities: pm pciexpress msi vga_controller bus_master cap_list
configuration: latency=0
resources: memory:c0000000-cfffffff memory:fea00000-fea3ffff ioport:e000(size=256) memory:c0000-dffff
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xrandr: Failed to get size of gamma for output default
Screen 0: minimum 800 x 600, current 800 x 600, maximum 800 x 600
default connected 800x600+0+0 (0x26e) normal (normal) 0mm x 0mm
Identifier: 0x26d
Timestamp: 22046
Subpixel: unknown
Clones:
CRTC: 0
CRTCs: 0
Transform: 1.000000 0.000000 0.000000
0.000000 1.000000 0.000000
0.000000 0.000000 1.000000
filter:
800x600 (0x26e) 36.000MHz *current
h: width 800 start 0 end 0 total 800 skew 0 clock 45.00KHz
v: height 600 start 0 end 0 total 600 clock 75.00Hz