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[John Rigby <732912@xxxxxxxxxxxxxxxxxx>]

More info, commenting out the lowest two operating points for 34xx makes
the problem go away:

diff --git a/arch/arm/mach-omap2/opp3xxx_data.c b/arch/arm/mach-omap2/opp3xxx_data.c
index e71c5ba..06b6297 100644
--- a/arch/arm/mach-omap2/opp3xxx_data.c
+++ b/arch/arm/mach-omap2/opp3xxx_data.c
@@ -105,11 +105,13 @@ struct omap_volt_data omap36xx_vddcore_volt_data[] = {
 /* OPP data */
 
 static struct omap_opp_def __initdata omap34xx_opp_def_list[] = {
+#if 0
        /* MPU OPP1 */
        OPP_INITIALIZER("mpu", true, 125000000, OMAP3430_VDD_MPU_OPP1_UV),
        /* MPU OPP2 */
        OPP_INITIALIZER("mpu", true, 250000000, OMAP3430_VDD_MPU_OPP2_UV),
        /* MPU OPP3 */
+#endif
        OPP_INITIALIZER("mpu", true, 500000000, OMAP3430_VDD_MPU_OPP3_UV),
        /* MPU OPP4 */
        OPP_INITIALIZER("mpu", true, 550000000, OMAP3430_VDD_MPU_OPP4_UV),

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https://bugs.launchpad.net/bugs/732912

Title:
  omapdss DISPC error: GFX_FIFO_UNDERFLOW

Status in Linaro Linux:
  New
Status in “linux-linaro-omap” package in Ubuntu:
  Confirmed

Bug description:
  observed using hwpack for omap3 dated 03102011, using the linaro-
  developer image dated 03102011

  The following message is found via dmesg shortly after boot

  [   76.143890] omapdss DISPC error: GFX_FIFO_UNDERFLOW, disabling GFX

  No other messages are seen related to this message. The system had
  completed booting, network was up and bash was just sitting at the
  prompt

  Further it seems out of the blue. The system had coml