I switched from gentoo-sources-4.3.3 to gentoo-sources-4.4.0 on my MacBookPro11,1 (13" Retina). Now every time the machine wakes up from suspend letters are missing in all windows in Gnome (3.18). When changing the font sizes the problem disappears. But when changing the font sizes back to normal the problem reoccurs. Switching back to gentoo-sources-4.3.3 (without any other change) resolves the problem but of course I don't want to be stuck on 4.3.3 forever.
Maybe this is related: http://www.spinics.net/lists/intel-gfx/msg82135.html
Hi. I can confirm this very strange behavior. What exactly happens for me: After some suspend/resume cycles I can no longer access any VTs until the next reboot -- they are just blank, showing blinking cursor in the edge. However, agetty and syslog are still running. And after some resumes, most letters disappear in all GTK applications. Qt apps, google-chrome and xterm are not affected. Last time it happened after VT switch (VT was already broken). I've observed this on gentoo-sources on 4.4.2 and 4.4.4. Right now I've switched to 4.1.15-r1 (current amd64 stable) and the problem seems to have disappeared. At least, I could not reproduce it by suspend/resume and VT switches. And VTs works completely normal now. I fear this is a regression in 4.4-kernel. My configuration: Lenovo X1 Carbon with EFI and EFI Framebuffer enabled, integrated video (Intel Corporation 3rd Gen Core processor Graphics Controller (rev 09)).
With gentoo-sources-4.5.2 this problem does not occur.
We first need to make sure that this isn't already patched, could someone try the newest 4.4.x kernel? In case that this isn't patched yet, could someone attempt to use the patches mentioned in the mailing list referred to in Comment #1? If those patches don't help, we will have to bisect between 4.3 and 4.4 (or reverse between 4.4 and 4.5) to find the patch that causes/solve this issue in an attempt to write/find a fix. The instructions on a bisect that can be found here: https://wiki.gentoo.org/wiki/Kernel_git-bisect Two similar bug reports with workarounds that we might want to track as well: https://bugzilla.redhat.com/show_bug.cgi?id=1317475 https://bugzilla.redhat.com/show_bug.cgi?id=1323762
I switched to gentoo-sources-4.4.6 and it seems the bug is already patched there. However, I will stay for some days at 4.4.6 and see if the issue reoccurs.
The bug is _not_ patched in gentoo-sources-4.4.6.
For me this issue is no longer relevant since I am on gentoo-sources-4.5.2 which works well for me.
Thanks for reporting this issue no longer occurs for you in later kernels.
