[dragonflyBSD] Massive display corruption with xf86-video-intel 2.99.917
Submitted by François Tigeot @ftigeot
Assigned to Xorg Project Team
Description
I see massive display corruption with xf86-video-intel 2.99.917 on a DragonFly 4.1/Ivy-Bridge system.
Windows contents or text strings don't get properly drawn, showing blank areas. Rectangular areas of the screen stay black or display the background root window content etc...
Sometimes random memory values are visible in the form of bright and changing pixels in the few top lines of the screen.
I have bisected this issue; it started with commit:
b4872f74
sna: Avoid pwriting large batches
Reverting it fixes the corruption.