I have an HP Pavillion G6 with Debian 9 installed. I tried reinstalling the graphic drivers using:
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sudo apt-get install --reinstall firmware-amd-graphics
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sudo lshw -c video
*-display
description: VGA compatible controller
product: Trinity [Radeon HD 7520G]
vendor: Advanced Micro Devices, Inc. [AMD/ATI]
physical id: 1
bus info: pci@0000:00:01.0
version: 00
width: 32 bits
clock: 33MHz
capabilities: pm pciexpress msi vga_controller bus_master cap_list rom
configuration: driver=radeon latency=0
resources: irq:34 memory:e0000000-efffffff ioport:3000(size=256) memory:f0300000-f033ffff memory:c0000-dffff
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$ sudo dmesg | grep -i radeon
[sudo] password for ericp:
[ 0.186811] smpboot: CPU0: AMD A6-4400M APU with Radeon(tm) HD Graphics (family: 0x15, model: 0x10, stepping: 0x1)
[ 18.389145] [drm] radeon kernel modesetting enabled.
[ 19.120490] radeon 0000:00:01.0: VRAM: 512M 0x0000000000000000 - 0x000000001FFFFFFF (512M used)
[ 19.120494] radeon 0000:00:01.0: GTT: 1024M 0x0000000020000000 - 0x000000005FFFFFFF
[ 19.120696] [drm] radeon: 512M of VRAM memory ready
[ 19.120698] [drm] radeon: 1024M of GTT memory ready.
[ 19.320603] radeon 0000:00:01.0: firmware: direct-loading firmware radeon/ARUBA_pfp.bin
[ 19.343435] radeon 0000:00:01.0: firmware: direct-loading firmware radeon/ARUBA_me.bin
[ 19.365020] radeon 0000:00:01.0: firmware: direct-loading firmware radeon/ARUBA_rlc.bin
[ 19.365419] [drm] radeon: dpm initialized
[ 19.453508] radeon 0000:00:01.0: firmware: direct-loading firmware radeon/TAHITI_uvd.bin
[ 19.503735] radeon 0000:00:01.0: firmware: direct-loading firmware radeon/TAHITI_vce.bin
[ 19.539866] radeon 0000:00:01.0: WB enabled
[ 19.539871] radeon 0000:00:01.0: fence driver on ring 0 use gpu addr 0x0000000020000c00 and cpu addr 0xffff9bc4525dcc00
[ 19.540252] radeon 0000:00:01.0: fence driver on ring 5 use gpu addr 0x0000000000075a18 and cpu addr 0xffffbea9c1c35a18
[ 19.560291] radeon 0000:00:01.0: fence driver on ring 6 use gpu addr 0x0000000020000c18 and cpu addr 0xffff9bc4525dcc18
[ 19.560296] radeon 0000:00:01.0: fence driver on ring 7 use gpu addr 0x0000000020000c1c and cpu addr 0xffff9bc4525dcc1c
[ 19.560299] radeon 0000:00:01.0: fence driver on ring 1 use gpu addr 0x0000000020000c04 and cpu addr 0xffff9bc4525dcc04
[ 19.560302] radeon 0000:00:01.0: fence driver on ring 2 use gpu addr 0x0000000020000c08 and cpu addr 0xffff9bc4525dcc08
[ 19.560305] radeon 0000:00:01.0: fence driver on ring 3 use gpu addr 0x0000000020000c0c and cpu addr 0xffff9bc4525dcc0c
[ 19.560308] radeon 0000:00:01.0: fence driver on ring 4 use gpu addr 0x0000000020000c10 and cpu addr 0xffff9bc4525dcc10
[ 19.560366] radeon 0000:00:01.0: radeon: MSI limited to 32-bit
[ 19.560429] radeon 0000:00:01.0: radeon: using MSI.
[ 19.560455] [drm] radeon: irq initialized.
[ 21.334517] [drm] radeon atom DIG backlight initialized
[ 21.334520] [drm] Radeon Display Connectors
[ 21.833527] fbcon: radeondrmfb (fb0) is primary device
[ 22.824162] radeon 0000:00:01.0: fb0: radeondrmfb frame buffer device
[ 22.898982] [drm] Initialized radeon 2.48.0 20080528 for 0000:00:01.0 on minor 0
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$ inxi -b
System: Host: sypha Kernel: 4.9.0-3-amd64 x86_64 (64 bit) Desktop: MATE 1.16.2
Distro: Debian GNU/Linux 9 (stretch)
Machine: Device: laptop System: Hewlett-Packard product: HP Pavilion g6 Notebook PC v: 088B110000305910000620100
Mobo: Hewlett-Packard model: 1849 v: 57.35
UEFI [Legacy]: Insyde v: F.26 date: 02/21/2013
Battery BAT0: charge: 19.8 Wh 100.0% condition: 19.8/19.8 Wh (100%)
CPU: Dual core AMD A6-4400M APU with Radeon HD Graphics (-MCP-) speed/max: 1700/2700 MHz
Graphics: Card: Advanced Micro Devices [AMD/ATI] Trinity [Radeon HD 7520G]
Display Server: X.Org 1.19.2 drivers: ati,radeon (unloaded: modesetting,fbdev,vesa)
Resolution: 1366x768@60.07hz
GLX Renderer: Gallium 0.4 on AMD ARUBA (DRM 2.48.0 / 4.9.0-3-amd64, LLVM 3.9.1)
GLX Version: 3.0 Mesa 13.0.6
Network: Card-1: Ralink RT3290 Wireless 802.11n 1T/1R PCIe driver: rt2800pci
Card-2: Realtek RTL8101/2/6E PCI Express Fast/Gigabit Ethernet controller
driver: r8169
Drives: HDD Total Size: 500.1GB (74.7% used)
Info: Processes: 164 Uptime: 38 min Memory: 2156.1/5444.6MB Client: Shell (bash) inxi: 2.3.5