Problems with screen resolution

[micaldas]

Hi,
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

I tried changing the the gama size of the display to default values, but it was no good.

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* 

And I get this strange output from lshw -c video:

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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

Below the output of xrandr verbose:

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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

Any help would be greatly appreciated, as I have no idea to where to go from here.

[arochester]

This is useful: https://www.youtube.com/watch?v=MScLD8dFNwk

[debiman]

I get this strange output from lshw -c video:

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*-display UNCLAIMED       
       description: VGA compatible controller
       product: Oland PRO [Radeon R7 240/340]
       vendor: Advanced Micro Devices, Inc. [AMD/ATI]

why is it strange?
you probably need to install a driver for that.

also please output of

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lspci -k | grep -iEA5 'vga|3d|display'

[Head_on_a_Stick]

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       vendor: Advanced Micro Devices, Inc. [AMD/ATI]

We get about a dozen queries a week about why AMD graphics cards won't work properly if the official Debian ISO images are used, why do none of you ever check the Debian wiki AMD page or search the boards before posting?

Please read the AMD page on the Debian wiki or at least confirm that you have followed the instructions therein.

[Wheelerof4te]

^Hey, don't forget about NVIDIA cards queries. Or Optimus queries. Or "muh wi-fi card don't work" queries.