Comment 5 for bug 1432194

I have a NUC5i3RYH with a very similar issue. Same kernel/driver.

I get the "missing (corrupt) letters" only, but no "black blobs". Particularly, this is an issue after resume from suspend. Regular usage is stable fresh from boot, so I do not get it as bad as Po-Hsu Lin.

Seems certain font sets get corrupted but once corrupted, are stuck. E.g. switching font size in terminal shows this. 11 pt broken, 12 point fine (until next suspend). Maybe if I do enough stuff (moving/resizing windows) the corruption moves.

See attached - note the "V" of "VGA compatible controller" near the bottom is mangled. This is typical. Corruption can occur within any app/title bar etc.

Is this any better on 15.04? Happy to help out testing fixes.

uname -a
Linux remerson-desktop 3.16.0-31-generic #43~14.04.1-Ubuntu SMP Tue Mar 10 20:13:38 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux

sudo lshw -c video
  *-display
       description: VGA compatible controller
       product: Broadwell-U Integrated Graphics
       vendor: Intel Corporation
       physical id: 2
       bus info: pci@0000:00:02.0
       version: 09
       width: 64 bits
       clock: 33MHz
       capabilities: msi pm vga_controller bus_master cap_list rom
       configuration: driver=i915 latency=0
       resources: irq:61 memory:f6000000-f6ffffff memory:e0000000-efffffff ioport:f000(size=64)

lspci
00:00.0 Host bridge: Intel Corporation Broadwell-U Host Bridge -OPI (rev 09)
00:02.0 VGA compatible controller: Intel Corporation Broadwell-U Integrated Graphics (rev 09)
00:03.0 Audio device: Intel Corporation Broadwell-U Audio Controller (rev 09)
00:14.0 USB controller: Intel Corporation Wildcat Point-LP USB xHCI Controller (rev 03)
00:16.0 Communication controller: Intel Corporation Wildcat Point-LP MEI Controller #1 (rev 03)
00:19.0 Ethernet controller: Intel Corporation Ethernet Connection (3) I218-V (rev 03)
00:1b.0 Audio device: Intel Corporation Wildcat Point-LP High Definition Audio Controller (rev 03)
00:1c.0 PCI bridge: Intel Corporation Wildcat Point-LP PCI Express Root Port #1 (rev e3)
00:1c.3 PCI bridge: Intel Corporation Wildcat Point-LP PCI Express Root Port #4 (rev e3)
00:1d.0 USB controller: Intel Corporation Wildcat Point-LP USB EHCI Controller (rev 03)
00:1f.0 ISA bridge: Intel Corporation Wildcat Point-LP LPC Controller (rev 03)
00:1f.2 SATA controller: Intel Corporation Wildcat Point-LP SATA Controller [AHCI Mode] (rev 03)
00:1f.3 SMBus: Intel Corporation Wildcat Point-LP SMBus Controller (rev 03)
02:00.0 Network controller: Intel Corporation Wireless 7265 (rev 59)