Created attachment 125110 [details] screenshot I started experiencing this issue with Mint 18, with the Oibaf ppa enabled. Mint ships with xserver-xorg-video-ati 1:7.7.0-1, so I was able to track down the issue from there using the source from the official repo. I traced it back to commit 1181b9c582f10b6c523e4b2988e2ce87ecf3d367 but as far as I can tell, this commit pretty much just enables DRI3 on this device: ( xserver-xorg-video-ati 1:7.7.0-1) [ 9837.338] (==) RADEON(0): DRI3 disabled ( xserver-xorg-video-ati 1181b9c582f10b6c523e4b2988e2ce87ecf3d367) [ 4355.160] (==) RADEON(0): DRI3 enabled dmesg shows errors like https://bugs.freedesktop.org/show_bug.cgi?id=94901 [ 44.866600] radeon 0000:01:00.0: evergreen_surface_check_linear_aligned:215 texture pitch 1680 invalid must be aligned with 64 [ 44.866604] radeon 0000:01:00.0: evergreen_cs_track_validate_texture:830 texture invalid 0x1a3c3441 0x10000419 0x0a0a0000 0x00000000 0x00000000 0x8002001a [ 44.866630] [drm:radeon_cs_ioctl [radeon]] *ERROR* Invalid command stream ! but then followed by: [ 9837.107021] gvfsd-network[29643]: segfault at 8 ip 0000000000403fa9 sp 00007ffea7be3740 error 4 in gvfsd-network[400000+7000] [ 9837.109294] gvfsd-network[29647]: segfault at 8 ip 0000000000403fa9 sp 00007fffd4c5a550 error 4 in gvfsd-network[400000+7000] both of which are only present when this or future versions are installed. This bug is mentioned here: https://forums.linuxmint.com/viewtopic.php?f=59&t=224526&p=1189762 (somehow does not affect MATE?) and also SEEMS to be mentioned here as well: https://github.com/linuxmint/Cinnamon/issues/5209 I'll attach a logs in a few minutes
kernel: 4.4.0-31-generic video card: [AMD/ATI] Caicos PRO [Radeon HD 7450]
Created attachment 125111 [details] dmesg for driver xserver-xorg-video-ati 1:7.7.0-1
Created attachment 125112 [details] dmesg for xserver-xorg-video-ati 1:7.7.99+git1606280732.3be841~gd~x
Created attachment 125113 [details] Xorg.0.log for driver xserver-xorg-video-ati 1:7.7.0-1
Created attachment 125114 [details] Xorg.0.log for xserver-xorg-video-ati 1:7.7.99+git1606280732.3be841~gd~x
OK, so digging into this even more, I think might be a duplicate of https://bugs.freedesktop.org/show_bug.cgi?id=95475 or at least related to it. According to the logs, EXA is used by default, so I tried switching to glamour and it works fine, even with the latest commit. I guess I could try rolling through the commits again with DRI3 and EXA enabled and see what commit actually breaks things since there are only a few commits between.
Looks like even with xserver-xorg-video-ati 1:7.7.0-1, setting EXA and DRI3 to enabled results in the same screen issue. Here's my /usr/share/X11/xorg.conf.d/20-radeon.conf file (I created this after the first 2 log sets): Section "Device" Identifier "radeon" Driver "radeon" Option "AccelMethod" "EXA" #valid options are XAA, EXA and Glamor. Default value varies per-GPU. Option "DRI3" "on" #enable DRI3 instead of the default DRI2-mode EndSection
Created attachment 125119 [details] dmesg with 20-radeon.conf and acceleration set to EXA (xserver-xorg-video-ati 1:7.7.0-1)
Created attachment 125120 [details] X.org.0.log with 20-radeon.conf and acceleration set to EXA (xserver-xorg-video-ati 1:7.7.0-1)
XAA also has the same issue including dmesg log errors. Looks like only Glamor works, confirming the other reports.
Just a note, this is not a 7750, but a 7450. Not sure how that slipped by.
*** This bug has been marked as a duplicate of bug 95475 ***
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