I was using 8.1 Jessie for a long while on a machine I have in my garage with no issues. Due to my usage model changing for that PC, I upgraded the machines motherboard and CPU to something with more oomph and threads (an old QX6700 circa 2007), and slapped all the same peripherals back into it from the previous machine. This includes the video card I had been using, a Radeon HD 6450 (passively cooled, always dependable).
Well since it was a whole new machine, I figured it was a good time to upgrade to Debian 9.3, so I installed stretch with no issues. However, now when my machine comes out of sleep, there's about a 4-in-5 chance that I will get really bizarre color artifacts. This weirdness will immediately go away if I go to settings and change the on/off state of the color profile setting (from on to off, or off to on, doesn't matter).
Since the fresh install, I've performed only the following operations:
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* Added contrib and non-free to the sources
* apt install firmware-amd-graphics
* apt install llvm-3.9 clang-3.9
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# lspci -k | grep -iEA5 'vga'
01:00.0 VGA compatible controller: Advanced Micro Devices, Inc. [AMD/ATI] Caicos [Radeon HD 6450/7450/8450 / R5 230 OEM]
Subsystem: PC Partner Limited / Sapphire Technology Caicos [Radeon HD 6450/7450/8450 / R5 230 OEM]
Kernel driver in use: radeon
Kernel modules: radeon
01:00.1 Audio device: Advanced Micro Devices, Inc. [AMD/ATI] Caicos HDMI Audio [Radeon HD 6450 / 7450/8450/8490 OEM / R5 230/235/235X OEM]
Subsystem: PC Partner Limited / Sapphire Technology Radeon HD 6450 1GB DDR3
# uname -rv
4.9.0-5-amd64 #1 SMP Debian 4.9.65-3+deb9u2 (2018-01-04)
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Feb 24 16:07:04 GaragePC gnome-control-c[14031]: /var/lib/gdm3/.local/share/icc/edid-18e40992cc420b9e33e14bbfb6d39bb6.icc is not usable by this user
Feb 24 16:07:05 GaragePC gnome-control-c[14031]: /var/lib/gdm3/.local/share/icc/edid-18e40992cc420b9e33e14bbfb6d39bb6.icc is not usable by this user
Feb 24 16:07:06 GaragePC gnome-control-c[14031]: /var/lib/gdm3/.local/share/icc/edid-18e40992cc420b9e33e14bbfb6d39bb6.icc is not usable by this user
Feb 24 16:07:06 GaragePC gnome-settings-[941]: failed to set screen _ICC_PROFILE: Failed to open file '/home/garageman/.local/share/icc/edid-18e40992cc420b9e33e14bbfb6d39bb6.icc': Permission denied
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