Messy screen updating on i915


I recently updated from Fed34 to Fed35. It mostly went smoothly but screen updating is messy and a serious slow down to any kind of work.

I use the LXQT spin and this seems to affect qt rather than wxt based programs.

geany, libreOffice, Thunderbird, XFE seem fine.

gnuplot (GNUTERM = “qt”) , Firefox , qt5 Designer, FeatherPad and desktop switching are messy.

This seems to be some kind of problem updating “dirty” parts of the screen. It does it piecemeal in lines inside larger rectangles, seemingly randomly around the screen. It can take 15-30 SECONDS to get a clean display.

In particular opening a file can be very painful and the list can take 15s to be even legible so I see where I’m going.

Is this a known issue.

lspci | grep VGA
 VGA compatible controller: Intel Corporation Xeon E3-1200 v3/4th Gen Core Processor Integrated Graphics Controller (rev 06)
 lsmod | grep vid
video                  57344  2 asus_wmi,i915

Thanks for any help / suggestions.