Comment 32 for bug 1573959

Similar bug for me too, with i915 driver but on HP Envy 6-1260sf (Core i5-337U) with Xubuntu.

In the list of affected applications, we can add Thunar, xfce4-panel and whisker (xfce menu).
Switching to VT-1 does NOT work for me, same for reloading xfwm4.
So Xubuntu desktop is unusable when the bug happens, and it is very hard to save work in progress because all browsing dialog are also affected.
Loggout/loggin restore the font display, but all current unsaved documents are lost.

The bug is only present after some suspend/resume but not always.

Hardware description :

root@draco-ultrabook:~# lshw -sanitize -numeric -C display
  *-display
       description: VGA compatible controller
       produit: 3rd Gen Core processor Graphics Controller [8086:166]
       fabriquant: Intel Corporation [8086]
       identifiant matériel: 2
       information bus: pci@0000:00:02.0
       version: 09
       bits: 64 bits
       horloge: 33MHz
       fonctionnalités: msi pm vga_controller bus_master cap_list rom
       configuration: driver=i915 latency=0
       ressources: irq:30 mémoire:c0000000-c03fffff mémoire:b0000000-bfffffff portE/S:3000(taille=64)

root@draco-ultrabook:~# lspci -vvnn -d 8086:0166
00:02.0 VGA compatible controller [0300]: Intel Corporation 3rd Gen Core processor Graphics Controller [8086:0166] (rev 09) (prog-if 00 [VGA controller])
 Subsystem: Hewlett-Packard Company 3rd Gen Core processor Graphics Controller [103c:1896]
 Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B- DisINTx+
 Status: Cap+ 66MHz- UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR- INTx-
 Latency: 0
 Interrupt: pin A routed to IRQ 30
 Region 0: Memory at c0000000 (64-bit, non-prefetchable) [size=4M]
 Region 2: Memory at b0000000 (64-bit, prefetchable) [size=256M]
 Region 4: I/O ports at 3000 [size=64]
 Expansion ROM at <unassigned> [disabled]
 Capabilities: [90] MSI: Enable+ Count=1/1 Maskable- 64bit-
  Address: fee00018 Data: 0000
 Capabilities: [d0] Power Management version 2
  Flags: PMEClk- DSI+ D1- D2- AuxCurrent=0mA PME(D0-,D1-,D2-,D3hot-,D3cold-)
  Status: D0 NoSoftRst- PME-Enable- DSel=0 DScale=0 PME-
 Capabilities: [a4] PCI Advanced Features
  AFCap: TP+ FLR+
  AFCtrl: FLR-
  AFStatus: TP-
 Kernel driver in use: i915
 Kernel modules: i915