Thanks for the bug report. It appears the blinking is compiz repeatedly crashing in the Mesa radeon driver:
[ 2322.696000] compiz[18685]: segfault at 39 ip 00007f6398e0511b sp 00007ffcfb66d320 error 4 in r300_dri.so[7f639879d000+10ab000] [ 2322.696026] Code: b6 40 2d eb ef 66 2e 0f 1f 84 00 00 00 00 00 f3 0f 1e fa 31 f6 e9 95 a2 f9 ff 0f 1f 44 00 00 41 54 48 8d 15 97 b8 b2 00 55 53 <0f> b6 47 39 48 89 f3 48 63 04 82 48 01 d0 3e ff e0 0f 1f 40 00 bd [ 2325.310971] compiz[18793]: segfault at 39 ip 00007f413ac7311b sp 00007fffd7f9e870 error 4 in r300_dri.so[7f413a60b000+10ab000] [ 2325.310997] Code: b6 40 2d eb ef 66 2e 0f 1f 84 00 00 00 00 00 f3 0f 1e fa 31 f6 e9 95 a2 f9 ff 0f 1f 44 00 00 41 54 48 8d 15 97 b8 b2 00 55 53 <0f> b6 47 39 48 89 f3 48 63 04 82 48 01 d0 3e ff e0 0f 1f 40 00 bd [ 2327.567322] compiz[18833]: segfault at 39 ip 00007f969a22311b sp 00007fff2653c300 error 4 in r300_dri.so[7f9699bbb000+10ab000] [ 2327.567347] Code: b6 40 2d eb ef 66 2e 0f 1f 84 00 00 00 00 00 f3 0f 1e fa 31 f6 e9 95 a2 f9 ff 0f 1f 44 00 00 41 54 48 8d 15 97 b8 b2 00 55 53 <0f> b6 47 39 48 89 f3 48 63 04 82 48 01 d0 3e ff e0 0f 1f 40 00 bd Please try using GNOME instead. ** Tags added: radeon ** Summary changed: - Xorg freeze + [radeon] Blinking screen ** Package changed: xorg (Ubuntu) => compiz (Ubuntu) ** Also affects: mesa (Ubuntu) Importance: Undecided Status: New -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1961561 Title: [radeon] Blinking screen To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/compiz/+bug/1961561/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs